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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › OF 5-Blade head too large for 50-size?
02-07-2008 03:03 AM  10 years agoPost 1
DEFILER

rrApprentice

Houston - USA, Balad - IRAQ, Kuwait - KWI

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Since Century can't keep up with demand and none of their 5 bladed rotorheads are in stock, I decided to go with the OF Helitechnik 5-Bladed head to put on my Trex600E for 10mm shaft. My question, I know it will "work" but scale-wise is the head too large to look right on the TT-50 MD530?
Also, what is a good resource for 550-size blades to put on this beast? OF only has 620 or 670 IIRC.

BTW, I have a Vbar coming also for this project. Any advice or other source (other than Vario) for a scale rotorhead would be appreciated.

Regards,
Chris

I only crash due to random planetary intervention

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02-07-2008 03:15 AM  10 years agoPost 2
stanc

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Conroe, TX

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As far as blades go, Heli World (Century) sold me 5 - 550 blades that all weighed the same. They will take several sets of blades and weigh them to find the number of blades you need. They were the gray Funkey and I think they were $140 or so for the set of 5.
A V-Bar is nice, but you might try it without anything or at most a 240 gyro on the elevator. I was surprised how my R50 with a five bladed head flew without anything at all for stabilization.

Stan

Stan
2- Logo 500
Ion X2
eAvro90

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02-07-2008 04:03 AM  10 years agoPost 3
DEFILER

rrApprentice

Houston - USA, Balad - IRAQ, Kuwait - KWI

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Thanks for the tip Stan I'll try Century for the blades.

As for the Vbar, I just don't want to take any chances in regards to the phasing and flyability of the head. I'm not that proficient yet lol.

Regards,
Chris

I only crash due to random planetary intervention

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02-07-2008 04:16 AM  10 years agoPost 4
stanc

rrKey Veteran

Conroe, TX

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The phasing isn't that hard to get right, you can do it with two mixes. Someone here was telling how to do it with a couple mixes, first mix is Aileron to Elevator (+100 to -100) and the second was Elevator to Aileron (+100 to -100). I tried it and it was fine, better than the link rods being at the angle they were at, now they can be straight or straighter than before.

Stan

Stan
2- Logo 500
Ion X2
eAvro90

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02-07-2008 05:08 AM  10 years agoPost 5
Red-Rx7

rrApprentice

Olathe, KS - USA

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Did you call Century and ask?

Their website is always wrong for in-stock status. I called, they made one for me in one day.

I would also recommend contacting Century for blades as well.

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02-07-2008 05:32 AM  10 years agoPost 6
seattle_helo

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Seattle, WA USA

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Chris, I have the 12mm shaft version on a turbine Vario 500E. It's a big head for sure- nearly a foot in diameter. It may look a little large on a 50 size bird. I'll be curious to know what you think once you have the thing and install it.

nick

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02-07-2008 08:00 AM  10 years agoPost 7
Gearhead

rrMaster

Vt

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Chris, you may want to wait for 3 reasons,

1) Century is getting a large shipment in around mid February (see the link),

2) you may want to wait because Century is testing a 50 size 3, 4 and 5 blade heads,,

3) the deference between the new 50 size heads and the larger 60/90 heads is the Blade Grips,, the way I understood it when I called Century is the new 50 heads use the same Head Block with the 50 grips and 6mm spindles,, so,, if you buy the larger head you will need 2mm spacers for each blade,, but the new 50 heads wont need the spacers,,

http://runryder.com/t405074p1/

I'm waiting LOL

Jim

Jim
Buzz Buzz Buzz

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02-07-2008 08:06 AM  10 years agoPost 8
Gearhead

rrMaster

Vt

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Stan,, you flew you Raptor 50 with a 5 blade head and 5 sliver Funkeys,,

can you tell us what engine and how low you went with the head speed and how the power was ??

thanks !!

Jim

Jim
Buzz Buzz Buzz

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02-07-2008 10:07 AM  10 years agoPost 9
fredd

rrApprentice

UK - London

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Does anyone have more specific info on the type of TX mixing needed to achieve specific phasing. For example, if you need 40 deg how would you do the mixing.

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02-07-2008 12:19 PM  10 years agoPost 10
stanc

rrKey Veteran

Conroe, TX

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fredd,
Set up the mixes like I mentioned and then play around with the numbers until you get the interaction out of the grip that is lined up with the boom when elevator is introduced. The +100 & -100 for both mixes seemed to do be just right, try it and see what happens.

the Wasp,
My Raptor 50 is converted to electric. It has a Z50A-600 Z-Power motor, 565kV w/9.55:1 gearing on 10S. That is almost 2200 at 100% throttle, but had the throttle dialed down to around 1800. The heli still had plenty of power, swing the 5 blades. I did notice the duration wasn't as long as with the 2 bladed stock head, should have and still can plug in my Flight Data Recorder and see what kind of amp draw and the voltage drop there is with the 5 blades.
Would like to get a lower kV motor to drop the HS without dialing down the throttle, might be a little more efficient that way. Using a Actro 32-4 w/415kV, but then would have to change the gear to the R50 gear of 8.5:1, that would be 1800 at 100% and then dial it down some so the governor would have some head room to work.

Stan

Stan
2- Logo 500
Ion X2
eAvro90

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02-07-2008 03:04 PM  10 years agoPost 11
Rodan

rrVeteran

Prescott Valley, AZ

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The diameter of the OF head (grip bolt to grip bolt) is 240mm. That's about 50% bigger than a standard R50 head. IMHO, I don't think it would look right on a 50 size bird. Even the current Century head looks very large on the 50 size helis.

I'm also very interested in the idea of dialing in swash phasing with a radio mix. Do you have a link to the thread where this was discussed?

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02-07-2008 07:36 PM  10 years agoPost 12
Gearhead

rrMaster

Vt

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actually it doesn't look bad at all,,

http://www.centuryheli.com/products...l?currentid=398

Jim

Jim
Buzz Buzz Buzz

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02-07-2008 07:38 PM  10 years agoPost 13
Gearhead

rrMaster

Vt

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thanks Stan..

Jim

Jim
Buzz Buzz Buzz

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02-08-2008 03:18 AM  10 years agoPost 14
DEFILER

rrApprentice

Houston - USA, Balad - IRAQ, Kuwait - KWI

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Thanks everyone for the comments I will wait for the century head and their new shipment so I don't have to use spacers for the blades. I guess Stan can help me dial in the mixes on my radio for the phasing once I get to that point. I agree the OF head would have been too large for this size bird.

I have decided to stick with my 6S setup so I need a motor recommendation for my gear ratio (Trex600E) on 180t maingear and 10 or 11 tooth pinion. I'm just not that experienced with the motor designations out there since not all manufacturers rate theirs the same.

I appreciate the help. I'll shoot more questions at you once I'm more organized :-)

Regards,
Chris

I only crash due to random planetary intervention

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02-08-2008 04:20 AM  10 years agoPost 15
stanc

rrKey Veteran

Conroe, TX

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Rodan,
Here is the thread about the mixes.

Stan

Stan
2- Logo 500
Ion X2
eAvro90

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02-08-2008 06:16 AM  10 years agoPost 16
Rodan

rrVeteran

Prescott Valley, AZ

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Thanks!

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02-08-2008 06:43 AM  10 years agoPost 17
Gearhead

rrMaster

Vt

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Chris,, I don't know if the new 50 head will be in the shipment !!

Jim

Jim
Buzz Buzz Buzz

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