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12-01-2005 03:03 PM  12 years agoPost 1
Thomashome

rrVeteran

West Sussex UK

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Why does the microheli head only come with one pin for the mixer arms? I pulled another from the trex head but before I bash it in, is it needed?

Thanks

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12-01-2005 03:56 PM  12 years agoPost 2
ingo777

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Singapore and Munich

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one pin works fine for me, but curious to hear other opinions!

ingo

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12-02-2005 12:29 AM  12 years agoPost 3
Nigel Brown

rrApprentice

Perth, Australia

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Hi tomashome,

You only need one pin, all it does is provide a guide for the centre hub to move on, one pin will also stop the centre hub from rotating around the head.


Cheers


Nigel

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12-02-2005 12:41 AM  12 years agoPost 4
OICU812

rrMaster

Edson, Alberta, Canada

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you only need one pin on the phase ring, if it were a bigger nitro the responses may be different. It should have two though..........just seems smarter!

...Once upon a time there were Nitros, flybars and frequency pins...

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12-02-2005 01:38 AM  12 years agoPost 5
3dmon

rrNovice

Sebastian, Florida USA

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Sure would be a bummer if in flight that one pin fell out.

The other day one pin fell out of the standard plastic align hub of mine, thank God it was on the table when it happened. I even had them ca'd in there.

I think MH should go ahead and stick an extra pin in for safety.

Fly 3D Mon!

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12-02-2005 01:48 AM  12 years agoPost 6
OICU812

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Edson, Alberta, Canada

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Can you imagine walking with one leg and a stick up your ass for balance, would be much easier and less painfull if the stick was stuck to the stump where the leg was, same applies here but "pain" is 'binding".
Now that was some funny stuff! LOL and yes I agree I have no clue what they are thinking running one pin, when I got my QNC i was like "WTF" is going on here??!! CHeers

...Once upon a time there were Nitros, flybars and frequency pins...

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12-02-2005 01:59 AM  12 years agoPost 7
MicroHeli.com

rrApprentice

PIS

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Thanks everyone for your feedbacks.

We already started to supply an extra pin together with every head so it's an option to have either one or two pins. The second pin comes in a plastic bag so customers just need to glue the second pin into the collar in case they want two.

Best regards,

Andy Le
MicroHeli Team

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12-02-2005 02:08 AM  12 years agoPost 8
OICU812

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Edson, Alberta, Canada

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Good to hear Andy!

...Once upon a time there were Nitros, flybars and frequency pins...

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12-02-2005 04:38 AM  12 years agoPost 9
Tool Man Vegas

rrApprentice

Las Vegas, Nevada, U.S.A

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aloha everyone,

very impressed with microheli. they are diffenetly paying attention to what we want and responding quickly. keep it up , Andy

DARTH HELI

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12-02-2005 06:40 AM  12 years agoPost 10
OICU812

rrMaster

Edson, Alberta, Canada

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willy you're one funny dude, lol

...Once upon a time there were Nitros, flybars and frequency pins...

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12-03-2005 05:21 AM  12 years agoPost 11
Tool Man Vegas

rrApprentice

Las Vegas, Nevada, U.S.A

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YEAH,

Maybe there should be a christmas discount on that new tailcase assembly. HO HO HO!

Head is nice, but TAIL is better.

DART HELI

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12-08-2005 03:53 AM  12 years agoPost 12
rcmike

rrVeteran

Dickson, TN

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I just put on a microheli head and noticed the pin was a little smaller than the ones on the stock head. It lets the washout base rotate more than I would like. I don't really know if this will be a problem since I haven't had a chance to fly it yet. If it is I can't decide if I should try to find a piece of tubing to put in the washout base as a sleeve or try to put bigger pins in the head or what.

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12-11-2005 05:57 PM  12 years agoPost 13
MicroHeli.com

rrApprentice

PIS

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Reviews

Hi everyone,

I copy the reviews here from trextuning so you can get more information on set up and adjustments.

Thanks Ashley for excellent job in the review and test fly.


-------------------------

The following is a product review of the MicroHeli Precision QNC RotorHead. My thanks to MicroHeli for supplying the part for review.

First let's take a quick look at what you get in the box.....

The box contains a pre-assembled rotor hub and blade grips, complete with antirotation pin, extra dampers and blade grip washers. As with any pre-assembled part, caution should be taken and the whole unit should be disassembled and rebuilt with loctite on the appropriate screws.

Also in the box is an exploded diagram of the whole assembly which was very useful in understanding exactly what this new head has to offer.

The unit is anodized blue, which is new for MicroHeli which traditionally have polished aluminium finish. I prefer this blue look to the usual polished aluminium look. Build quality is excellent and the whole thing looks like a step up in quality from the standard Align head. It also has a more compact look and feel to it than the Align offering. However, this is just on looks and quality of machining the question of technical capability also needs asking. I will come onto this later.

The head is configurable for soft (beginner) or hard (3D) dampening. The head comes pre-assembled with soft dampening installed, this is just one rubber damper and an aluminium spacer. For 3D damping you remove the aluminium spacer and add the second damper giving two o-ring dampers per blade grip. I didn't test both and for my flying style selected the double dampers for the flight testing on this upgrade. This configurable head damping is common in larger helis where harder or softer dampers can be installed for different flying styles. Soft dampers suit more scale like and smooth flying characteristics, hard dampers are needed for 3D to stop mid-air boom strikes and to give the collective crisp response for moves like tic-tocs.

The blade grips themselves are secured to the feathering spindle by use of a bolt and washer, exactly the same as the Align stock and upgrade blade grips. Loctite MUST be used on these bolts when assembling. The pre-built head did not have any loctite on these bolts so do not install this directly to your T-rex without first disassembling and applying loctite.The antirotation pin for the washout hub bolts around the bottom of the rotor hub and is secured in place with a very small grub screw. This does make the overall length of the rotor hub and how far it sits down on the main shaft once installed, again more on this later.

The most important aspect of this rotor head and grips is that it is thrust raced, unlike the Align blade grips. Thrust races are specially designed to bear longitudinal forces and rotor speed beyond 3000RPM should be feasible with this head and grips. The Align head starts to suffer from bearing freeze once you push up beyond 3000RPM and it is possible to have the bearings lock up. The use of thrust races is a very welcome addition as it allows for a much smoother running blade grip when utilizing 3D rotor speeds in the upper 2800 to 3000RPM. The positioning of the thrust race can be seen below in the blow up picture of the instructions. Bearing quality is also good.




Build / Setup

Overall the build quality is excellent, if I was looking to compare I would say it is as good if not better than the Align hub and grips. Installation was a relatively straight forward affair but caution should be taken as it is not just a simple case of swapping one rotor head for another.
I fitted the MicroHeli flybar mixers and cradle to the rotor hub to finish the main rotor head off ready for fitting to the main shaft. I quickly discovered that the MicroHeli rotor hub sits further down on the main shaft than the standard or upgrade Align rotor hub. The effect of this was that the washout hub would bind on the bottom of the rotor hub at full collective pitch. The arms from servos to swashplate needed to be shortened to sit the swashplate and mixers lower down the main shaft. The control rods from swashplate to flybar mixers could then be lengthened to account for this. Having done this a pitch range of -10 to +10 is easily achieved. Make sure that you have horizontal mixers arms and 0 degrees of pitch at mid stick, my initial attempts required significant adjustment. It took some time to get this right but the effort is worth it for nice predictable flight characteristics. I inserted BlueBird 320mm carbon blades for the flight testing and use of the supplied blade spacers was required to get a nice snug fit.

Although I didn't install or use the single dampers and aluminium bushes you can see the aluminium bushes in the picture above left. The top plastic bushes press against the dampers and hold them in place in the rotor head, the aluminium bushes sit at the center of the main hub. The o-ring damper itself sits between the aluminium bush and the plastic bush.
Double damping is achieved by just removing the aluminium bush and replacing with an o-ring.

Flight characteristics

I didn't test the single damping option because although it is an option the majority of pilots buying this head upgrade are looking for 3D performance.

Initial hovering had me thinking the machine felt quite soft and I was concerned that 3D may not be particularly good. Having completed a pack of hovering, trimming, setting up tracking etc etc my conclusion was that the head was certainly accurate and control was almost identical to what I have come to expect from the Align metal head and grips.

Next two flights were all out 3D, flips, piro-flips and tic-tocs, I also threw in some loops, rolls and inverted push overs as well as some inverted hovering, just to get a feel for the machine inverted on this new head and grips.

The machine I used was a 4S powered 450TH as I wanted to put some real power through this head and see how it coped.

Tracking was slightly out but it was not varying with collective so a small adjustment will be required but in the interests of time (as light was failing) I chose to leave it and get on with the flying. I would only be concerned about this if the tracking was varying wildly through collective changes, which it wasn't, so it's a simple case of just getting it adjusted correctly on the next flight. Additionally it was only a very small deviation in tracking (about 1 cm) and no vibration was being induced , so I could asses flight performance without any worry of this affecting performance.

I did some fast circuits and stall turns to get a feel for the machine and it felt locked in and solid. I setup for a loop and checked inverted power at the top to make sure she would hold OK through flips or inverted hover. The machine responded with some but in my view not enough inverted climbout so I landed and electronically added some extra throw on the collective at the low end. Back in the air I did the same again and this time she punched up nicely at the top of the loop. Turning back on the downwind leg I tried a slow roll with an extended inverted stage, again it felt locked in and responsive with no wandering off track. I then pulled a few fast rolls, some more loops and some stall turns but using the collective to hold steady the vertical position in the wind. Again all nice and positive and confidence was starting to build to try some more adventurous stuff.

At this point in the flight I would be hard pressed to distinguish between the Align head and grips and the new MicroHeli QNC rotor head but that was about to change.

Coming down and flying lower I went for a basic stationary forward flip. She whipped over quite quickly but at the switch from positive to negative pitch I noticed a harder edge than I am used to in the response. Normally on the Align head the swap from positive to negative pitch feels a bit soft and there is some blade slap, the MicroHeli QNC rotor head was different and it took several more flips to start to get a feel for what was different. The MicroHeli head definitely has a harder and crisper edge to it on collective changes, the pitch comes in harder and holds better than the Align head. This also translated into a more positive tic-toc later in the flight where quick pitch changes need to have that hard edge for the tic-toc to look and feel right. I also noticed that on flips it was easier to catch the T-Rex and not lose height than on the Align head. As a last flight check I pulled a couple of piro-flips and although they were a bit messy due to the tail being a bit quick (I must reduce the piro rate slightly on the gyro end points) I was rewarded with a reasonable collective response through the flip.

The second flight just served as a check and balance on my initial thoughts and throughout the crisper collective response could be felt in the collective based 3D moves. I also did some inverted hovering just to see if inverted would feel any different to normal hovering but the response was consistent whatever way up I decided to hover. I left the field quite pleased overall as I had initially thought that I might struggle to differentiate between this head and the one from Align. The designs are very similar in terms of damping, with the only major difference being around the ball bearings used.





Overall conclusion

MicroHeli always try to build some level of innovation or performance based ingredient into their products. In this case the most obvious being the thrust races in the blade grips. These I'm sure allow the blade grips to function smoothly when under the extreme load characteristics of 3D flight. On the whole the QNC rotor head only shows it's true colours as you start to push the T-Rex quite hard, leading up to this point it behaves very similarly to the Align head and grips. Therefore in terms of who would benefit from this upgrade I would have to point directly at the hard core 3D fliers rather than those at the beginner or sport flying stage. Having said that, this is a product that can grow with your abilities as it behaves exactly like the Align head for sport flying.

The last MicroHeli review I performed was for their Carbon Frame and I had mixed feelings throughout the review on whether the frame was to my liking, particularly around design but as usual for MicroHeli products the flight performance was good. This item from MicroHeli is entirely different, the design is right, it improves upon the Align product (stock and upgrade) and the performance is top notch. It also looks great on the machine and I'm very pleased that MicroHeli now offer anodized parts which in my opinion look better than the usual polished silver. MicroHeli have always targeted performance seeking pilots and in this instance they appear to have got their sums right.

I recommend this product for confident 3D pilots who can push the T-Rex to gain the performance benefits offered. Beginner or intermediate pilots may not benefit from this upgrade over and above the Align upgrade head and grips but it is a product that can grow with the abilities of the pilot and offer more as the pilot demands more.

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12-11-2005 06:16 PM  12 years agoPost 14
hikscub

rrApprentice

California

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Having bought the blade grips I have to say I was not impressed. Here were my problems:

- The silver "elbows" bend easily.

- The screw holes holding the balls to the silver "elbows" stripped out. Basically the silver elbows are really soft. I had to CA them in.

- The tiny holes that hold the silver elbows to the body of the grips were not straight so that the elbows are not in alignment with the grip body - one points a bit up and the other a bit down. So I've got radically different lengths on the links to the grips.

- The washers are way too thick for woodies. And they are a horrendous pain to deal with when putting on the blades. They move around and it's hard to get all the holes lined up.

Andy did offer to send new elbows to me but I never received anything. He also said I could send the grips back for replacement. To Vietnam? - I don't think so. I'm not willing to wait that long or pay the postage.

I know they produce great stuff and many folks are happy. I just got a lemon I guess and uH has not been satisfactory at taking care of the issue. Thought folks should know...

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12-11-2005 06:32 PM  12 years agoPost 15
MicroHeli.com

rrApprentice

PIS

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As we exchanged emails we already agreed on something

1. Always loctite all the bolts and screws before assembling it to the heli.
2. Washers are for the stock blades and cannot accomodate ALL blades root thickness. Just sand the blade root a little bit and it will fit fine.

If you got the side arms bent, we can replace for you. You can get directly from us or request your dealer to contact us.

If you got defect parts, you can either send directly to us or send to some dealer that can ship back to us later on.

You can get replacement not only directly from us but also from your dealer near you by pre-arrangement with us.

We strive our best to support all customers.

If you still need further helps, please feel free to contact us support@microheli.com

Andy Le
MicroHeli Team

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12-11-2005 08:40 PM  12 years agoPost 16
Hellijunky

rrVeteran

Chicago

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i took a leap of faith ordering a microheli rotorhead...i say that BC i already had a bad experience with there precision flybar i dumped a hundred bucks on
and never could get to work right...Andy said he was going to send me something to compensate for my loss on that I believe him but as of yet I haven't gotten anything....anyway I haven't recived my new microheli rotorhead yet
this is the first time i have seen close-up pictures of one....i am no aeronautical
engineer but do any of you guys see a problem with this grip? all i got to say if this thing is junk to its going STRAIGHT BACK and i will go back to plastic grips
and rotorhead...seems to me align is really laying some eggs with these new, all metal rotorheads i have one here that among other things is completely useless BC the depth of holes "where the o rings go" one is .50mm deeper than the other and it will never spin true...i wont be to hasty to judge my new microheli rotorhead though..just by looking at this shot i can say the craftsman
ship looks kind of weak

http://img491.imageshack.us/img491/1451/9copy7cn.jpg

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12-12-2005 01:33 AM  12 years agoPost 17
Hellijunky

rrVeteran

Chicago

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yea

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12-12-2005 01:52 AM  12 years agoPost 18
hikscub

rrApprentice

California

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Andy,

1) Yep that's true but that's not my actual problem. Lock tight or no, the ball screws rip out of the elbows during crashes. Just happend again 1 hour ago. That silver metal is just too soft.

2) Have you actually tried what you are recommending? Those washers are so think you'd have to sand the entire plastic end piece off the wood blades.

I got my uH grips from GrandRC. Are you saying it's Ed's responsibility to replace these grips for me? Ed gives great service but this is uH responsibility.

I do have an idea though... if you offered a bulk pack of the silver elbows they might make for a good failure point. In a crash the ball would rip out and help save blades, main shaft, etc. Then just screw on a new elbow and go again. Kind of like using the plastic blade grips as the failure point.

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12-12-2005 03:34 AM  12 years agoPost 19
MicroHeli.com

rrApprentice

PIS

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Thanks for your recommendation.

We can supply those arms to sell separately at very low cost so just like a small piece to change when you crash. That can be done very easily.

For wooden blades, i am not sure what type of blades you got but we use same washers and it fits just fine for all align stock blades.

For the pitch range, we increase our shaft length to 45mm, 5mm more than stock shaft to get equal pitch range. which side you have more pitch range? Do you have the oring in the shaft?

For products, normally we can replace directly from us but it woulo take longer time, if the dealer are willing to send you new replacement first then we can replace that to them next shipment for their order. That way you can get replacement faster. We all support our dealers and our dealers will support you.

Andy Le
MicroHeli Team

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12-12-2005 03:50 AM  12 years agoPost 20
Hellijunky

rrVeteran

Chicago

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thank you for your reply Andy

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