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HelicopterMain Discussion › Update on the Huey Cobra
12-18-2016 01:04 AM  10 months agoPost 1
tjk1812

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sunbury, ohio - USA

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So I have found some time to work on the Huey Cobra and because I got a few more parts (thanks to rcpilotMike and Ebay) it's a bit closer to being completed. I did remove some of my earlier graphics from Callie because she used two different shades of yellow and some were a bit big. But after I called her she took care of the problem and it's all good. I have a few more decals to apply and a little touch up here and there. The Cobra is fitted with GMP Cobra mechanics and because of the plastic pilots, I had to lower the servo tray to make it work. This means doing some re-engineering to the servo arms and rods to make the swash move in its correct directions. Its time consuming but I enjoy it. The original GMP mechanics, when I purchased the heli, had a Schulter rotor head with no flybar to make it look more scale. I removed it and installed a GMP custom head to make if more flyable. However, I noticed the main rotor blades are weighted. Can weighted blades be flown with a flybar? Does it even matter? Or should I go back to the original Schulter head and just add a three axis gyro? I'm hoping to try next spring to get it in the air and I'll be looking for some help flying it. (hint, hint to anyone living in Columbus, Ohio) Thanks.

Tom

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12-18-2016 09:24 PM  10 months agoPost 2
JuanRodriguez

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The Villages, Florida

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Why two threads on the same subject ??

Been there, done that and old enough to know better.....

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12-19-2016 12:39 AM  10 months agoPost 3
tjk1812

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sunbury, ohio - USA

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Posted in main discussion, then realized it's more appropriate for the antiques seeing how GMP mechanics are pretty old.

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12-19-2016 12:16 PM  10 months agoPost 4
Richardmid1

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Leeds, England

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Can weighted blades be flown with a flybar? Does it even matter?
Yes they can. They will simply add stability but may slow down cyclic response, but that isn't so important flying scale anyway.

60% of the time, it works every time!

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12-20-2016 02:03 AM  10 months agoPost 5
tjk1812

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sunbury, ohio - USA

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Ok, thanks!

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12-22-2016 05:37 PM  10 months agoPost 6
ticedoff8

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Morgan Hill, CA. USA

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You sure it was a Schulter head?
GMP did have an FBL head at the time. I think it was called the "Elite" head and they used it on their Legend

At the time, weights were originally added to wooden blades to improve their autorotation capabilities.
Without them, autos were pretty tough.
And, unweighted blades had a tendency to "woof & poof"

In your case, they may be little heavier than what was typical at the time due to being used on an FBL head.

The extra weight in the blades made FBL flight possible long before there were 3-axis gyros.

But, there were very few FBL heads being flown, so they may just be typical wooden FB blades.

The head was not designed for a 3-axis gyro so it would fly pretty well without one - as long as the blades are on the heavy side.
If you do use a 3-axis gyro, keep the gain down.

If the blades are from the same time period as the rest of the heli, they are also non-symmetrical. They have a flat bottom.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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12-22-2016 07:38 PM  10 months agoPost 7
tjk1812

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sunbury, ohio - USA

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Yeah it was a schulter top head. I actually sent some photos a while back to Gorham via facebook and he identified it for me..or at least confirmed my thoughts. The rotor grips and top button were Schulter and it was fitted over the GMP cobra main shaft. Looked real scale, but not too sure how flyable. Thanks for the help regarding the blades, I may one day transition back to the FBL to keep it looking scale, but for now just use the standard 'custom' GMP cobra head.

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