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HomeScaleAircraftHelicopterScale Model RC Helicopters Docs  Blue Thunder Down-Under - Smartmodel 700 BlueThunder with fenestron
11-18-2011 12:27 PM  6 years agoPost 261
Heli143

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Phenix City, Alabama

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can you use the step down collar from Century helicopters?

It came with my five bladed head to step it down from 12mm to 10mm.
I think they call it a sleeve.

Roy Mayoral

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11-18-2011 12:39 PM  6 years agoPost 262
heliadictaholic

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Hobart, Tasmania - Australia

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Thanks Heli143,
I ordered a sleeve with the head. I think it is what I need. I will soon find out when it arrives... Only thing I am not sure of is the length of the sleeve. It needs to reach from the head, down through the swash. Won't be a problem if it is not long enough, I have a lathe and I can make a sleeve easily enough. Only thing is, I am not sure if it needs to be hardened. I think if I made it out of stainless, it might be OK.

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11-18-2011 04:20 PM  6 years agoPost 263
Heli143

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Phenix City, Alabama

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the sleeve I am using goes inside the head and mates up to the bottom of the head. The jesus bolt is above the bottom of the head so I did not have any issues.
Waiting to hook up with my mentor to set it up for me and do a test flight before I put my shaky fingers on it.
so far so good...

Roy Mayoral

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11-18-2011 10:39 PM  6 years agoPost 264
heliadictaholic

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Hobart, Tasmania - Australia

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Yes, the sleeve I have ordered is probably similar to yours - it slides into the head and has a lip around the bottom end that seats against the head. My problem is, the scale looking swash that comes with the SuperScale head is 12mm inside diameter. I also need a sleeve for that area of the shaft. Won't be too much of a problem....

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11-18-2011 11:02 PM  6 years agoPost 265
Heli143

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Phenix City, Alabama

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got it!

best of luck. I know you will get it right

Roy Mayoral

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11-18-2011 11:13 PM  6 years agoPost 266
JRAY

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LaGrange, Georgia, USA

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Thanks heliadictaholic. Well, wish I still had my 600 then. Nothing wrong with adding a nother to the fleet!

I am serious.....and don't call me Shirley.

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11-21-2011 01:39 AM  6 years agoPost 267
heliadictaholic

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Hobart, Tasmania - Australia

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Geeeezzz!!!! A bit off topic - but - have a look at this.... hopefully the link works OK...

http://www.modelairplanenews.com/bl...20and%20more%21

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11-26-2011 06:37 PM  6 years agoPost 268
Wing_Commander

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Surrey, UK

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Hi All
Hi guys,

I have been following all your good work and am well impressed. I would very much like to hear about how far each of your individual efforts have gotten along.

As I'm thinking of getting one for myself.

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03-05-2012 02:19 AM  6 years agoPost 269
heliadictaholic

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Hobart, Tasmania - Australia

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Hey guys - you awake?

I have been drawing in 3D, a scale rotor head for the 700 BlueThunder and Gazelle helicopters (will also suit 800). Hope to have some CNC machined.... Have a look at the attached picture to see where I am with the drawing......
....But...., I have a problem... The rotor head will look scale but obviously will not operate as the full size version..... The Gazelle/BT rotor head has a lead lag damper - the scale model has a fitting that looks like the lead lag damper.. The full size rotor blades have 2 mounting pins and a separate main mounting pivot pin, the scale head has only one main pin - the blades are fixed slightly differently to the full size version. My problem is, I need to be careful that the blade does not hit the "look alike" lead lag damper main mounting pin during blade lag. Can anyone tell me if they have any idea on how much a blade will "lag" under normal operation. The setup that I have will allow about 120mm lag at the tip of a 700 blade, before the blade will contact the lead-lag main pin.

There is another issue, if the heli is involved in an accident, the blade will be forced back into the damper main mounting. I think I could use aluminium tube for the lead-lag mounting pin. This pin should deform and release allowing the blade to move back in an accident and hopefully minimise damage to the head.

I have printed in 3D, some test pieces to check the fit - see pics...

Does anyone have any advice they can provide?

H

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05-14-2012 09:18 PM  6 years agoPost 270
JRAY

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LaGrange, Georgia, USA

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heliadictaholic, that is awesome! Ever get those pieces worked out?

By the way, do you guys think T-Rex 550 mechs would work in BT? Just curious as I have two and was planning to stretch one for a 600 size scale heli, I figured this might be cooler than the MD that I was going to build, that and I loved Blue Thunder growing up.

I am serious.....and don't call me Shirley.

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05-15-2012 12:21 AM  6 years agoPost 271
heliadictaholic

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Hobart, Tasmania - Australia

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G'day JRAY,
Not too sure about the 500 mechanics. The BT is a 700 size heli that will accept 600 mechanics. Trex700 mechanics will not fit - I am running 700 blades. I don't know anything about the 500 size mechanics but I recon the main rotor drive ratio might need to be checked out.

Hopefully the BT/Gazelle 700/800 rotor head will be in production soon. I had a couple of "irons in the fire" (looking for CNC guys) but looks like "the fires went out"... So I contacted another CNC guy last weekend and looks promising - might be a "goer" - "fingers crossed"..... I still need to tidy up a couple of the detail drawings for the CNC guy. Just waiting on him to let me know what extra details he needs...

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05-15-2012 07:49 PM  6 years agoPost 272
JRAY

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LaGrange, Georgia, USA

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Well, if you can find someone to make those, it would be fantastic. They look great!

For the mechs though, I'm talking about the 550, not the 500. I saw a thread on HF where a guy stretched a 550 with a 700 boom and blades mounted in a Jet Ranger fuse and since the BT doesn't need a boom (self driven fenstron right?), I was just wondering what your thoughts were. The 550 uses some of the same parts as the old 600ESP (motor, head, swash, etc), just slightly smaller/narrower frame. Figured that might give more room inside and be lighter. I would probably have to beef up the frames sides though for strength and to keep vibs down. Just a thought.

I am serious.....and don't call me Shirley.

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05-16-2012 12:25 AM  6 years agoPost 273
heliadictaholic

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Hobart, Tasmania - Australia

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G'day Jray,
I don't know anything about the Trex500, same goes for the Trex550 - I do have a Raptor E550 which is nothing like the Trex550.

Probably no problem fitting the Trex550 mechanics except maybe if the frames are narrower than the 600, you might need additional bracing between the fuselage and the mechanics framework. I make my own sideframes similar to the Trex600 (see earlier posts), from 3mm aluminium because I had big vibration problems in my Trex600 AirWolf. The frames were flexing badly. Having said that, the frames that were flexing were only fibreglass frames. CF might be better??? I did not test CF because 3mm aluminium was very cheap compared to CF.

The BT can be quite heavy if you add all the trimmings so the side frames should be up to the task.

I would still check your drive components to make sure you can get the correct head speed especially if you use a 3 blade head and blades similar to the narrow chord supplied by TFModel and SmartModel. Due to their design, these blades should not be run above a certain RPM as specified by the supplier/manufacturer. If the 550 uses the same drive components as 600 then should work OK.

I understand the later versions of the Trex frames is a bit wider than the earlier frames.
Maybe someone else might like to comment on the frame/drive differences and suitability....

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05-16-2012 10:11 PM  6 years agoPost 274
JRAY

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LaGrange, Georgia, USA

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Thanks for the post and info heliadictaholic. The 550 may be too small for BT then. Since it's an in between size, although it is much closer to the 600 than the 500. I saw my first T-Rex 500 a few weeks back and couldn't believe that the 550 was that much bigger, however, it is still less, frame wise, than the 600. Maybe I could find and grab another 600ESP at a good price.

I am serious.....and don't call me Shirley.

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05-17-2012 06:27 AM  6 years agoPost 275
Elthi

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Brussels, Belgium

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Hello all,

For information, in english magazine Model Helicopter World of October 2011, you can find a review of this model fitted with a Trex 550 with OF 3 blades rotor head and OF 650 mm blades...

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07-09-2012 02:50 PM  5 years agoPost 276
JRAY

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LaGrange, Georgia, USA

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Any user flight videos out there?

I am serious.....and don't call me Shirley.

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07-11-2012 09:20 PM  5 years agoPost 277
Whitefang

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Memphis, TN - USA

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Blue Thunder
Just just found this website, so this is my first post.

I guess I have 20+ scale helicopters, and have been building and flying them for over 30 years.

I also have a 600 size Blue Thunder, (with a spare one still in the box) and do have quite a bit of building and flying experience with it.

I would be glad to share what I have learned if anyone is building one, and who might have an interest.

One of the biggest things I did learn about this helicopter, is that the fenestron produces very heavy feedback on the tail pushrod.
You MUST use a 100+ oz tail servo or you cannot fly this thing! And it works best if you don't use a Y, but slave the tail servo to the throttle servo output control, and set the curve to be at ~80% power at hover.

I fly mine with a 8S on the main rotor, and 4S on the tail and it works great.

If you do these basic things, you have a sporting chance of getting the thing to fly quite nicely.

I have had it in fast foward and agressive flight, but I haven't looped it yet, but I'm sure it can. It is a stunningly beautiful bird in flight and it gets plenty of attention at the field.

Hope I can be of service to any of you.
Terry

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07-12-2012 12:19 AM  5 years agoPost 278
heliadictaholic

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Hobart, Tasmania - Australia

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G'day Terry,
Great to hear from you..... I am new to scale - I have a 600 AirWolf and the 700 (600 mechanics) TFModel BlueThunder.
My BT project has taken second place to home renovations and going boating. I still have not got the thing in the air yet....
I am using a 3 blade head with 700 narrow chord blades and a BeastX system.

One thing I am confused about is your statement "And it works best if you don't use a Y, but slave the tail servo to the throttle servo output control,"

Can you please expain what you mean and how this will work.
Did you mean to say tail motor - not servo?

I understood that the "Y" lead was installed in the throttle servo output control on the RX and each end of the "Y" went to each ESC.... Just a bit confused...

Regards,

Jim

ps. Can you post some photos...

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07-12-2012 09:22 PM  5 years agoPost 279
Whitefang

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Memphis, TN - USA

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Sorry for the confusion.

My Blue Thunder has a dual motor set up. One motor for the main rotors, and one motor for the fenestron. Each has it owns battery supply and ECS. I use the Thottle output of my JR9303 to control the main rotor, and use Aux2 to control the tail rotor.
The Aux2 output is slaved to the Throttle output. That way I can independtly control the bias output curves to the tail, while yet keeping them working together as needed.
Fenestron tail units are not effectve at low RPM! In a desent, you can end up with the fenestron not fast enought to keep good tail control. If you set your High-idle curve to increase the tail speed, you pay for it with too fast of a head speed.
By using this type of split control, you can have the fenestron keeping ~80% power on, while the main is only needing ~50% power in a desent.
On mine, the power curve for the tail is approx 0/0%, 1/30%, 2/60% 3/80%, 4/90%, 5/100%. This gives the machine good control at all flight attitudes.
Hope this helps some.

I'll try to post some pics tommorrow.

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07-12-2012 10:04 PM  5 years agoPost 280
bell222

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Australia

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here is mine
completed and flying

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HomeScaleAircraftHelicopterScale Model RC Helicopters Docs  Blue Thunder Down-Under - Smartmodel 700 BlueThunder with fenestron
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