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 6 pages [ <<    <     4      5     ( 6 )    >    >> ] 8978 views POST REPLY
08-07-2018 10:26 PM  76 days agoPost 101
garyl

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Joel, I can't thank you enough for your help with this project, it would have been nearly impossible with out your mixer.

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08-08-2018 08:00 PM  75 days agoPost 102
bwellmaker

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Long Island

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Gary,

Great to here it worked and you got it in the air.

Going to be a cool heli.

B

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08-26-2018 10:33 PM  57 days agoPost 103
garyl

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I have been on vacations here and there and just came back from one of them yesterday so today was heli test day.
I finally figured out the gain that was causing oscillation that looked like cyclic but it was actually the yaw. I turned down the yaw gain to 10% and the cyclic to 40% and the result is shown in this video. Overall it fly's smooth with minor vibes that I think head dampening changes will handle, to be determined. As it is right now it uses 383mA/minute on 12S.

Watch at YouTube

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08-26-2018 11:30 PM  57 days agoPost 104
Phoenix NOTAR

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Tallahassee, Florida USA

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Well that looks a lot better than the first “flight”. Well done!

Maybe a larger flying field next time

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08-27-2018 12:01 AM  57 days agoPost 105
bwellmaker

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Long Island

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Flippin SWEET!!!

Nicely done.

B

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08-27-2018 02:08 AM  57 days agoPost 106
Joel Rosenzweig

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Marlborough, MA - USA

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Gary,

That’s great!!! I have some O rings you can have if you want to change the dampening. I used them in my SAB heads on my Chinook. I bet they would work for you too.

Joel

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08-27-2018 05:42 AM  57 days agoPost 107
R.J.

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SF bay area, CA USA

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So cool, congratulations! So strange to see a helicopter fly with no fuselage or tail boom. Looks really great.

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08-27-2018 11:59 AM  57 days agoPost 108
garyl

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Thanks everyone! Getting the heads and swash plates setup exactly the same is critical to getting this thing to fly correctly.

Sandy,
I didn't have time to get everything to the field so the backyard had to work for now. Before I go flying off into the wild blue yonder I have to setup a tail boom so I know which end is forward from far away.

Joel,
Did you use other than stock O'rings in your heads?

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08-27-2018 09:43 PM  56 days agoPost 109
ssmith512

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Indianapolis, IN USA

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Sweet!!

That is cool looking and weird looking at the same time.

Steve

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08-28-2018 06:14 PM  55 days agoPost 110
Joel Rosenzweig

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Marlborough, MA - USA

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Hi Gary,

Yes, I used some other O-rings that I got from Amazon. If you want more dampening than the softest setting in the head, then these O-Rings will help.

That said, I don’t know if you really need more dampening. But if you do, there’s an option. I have a bag of them. So you can take what you need if you want to play.

Joel

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09-07-2018 01:33 PM  45 days agoPost 111
garyl

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The trailing edge of the rotor blade at the root would make a little tick at high collective during certain situations.
As you can see it gets close.

To fix this I did what the full size did and made a norrow cord at the blade root which fixes that issue.

I upgraded the gyro to the Axon, just want to see if it is better than the 3sx.

Made a tail boom assembly to expand the flight test envelop so I can see which way is forward from far away.

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09-07-2018 06:19 PM  45 days agoPost 112
buster1

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Manhattan, NY

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extremely impressive!

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10-22-2018 10:12 PM  14 hours agoPost 113
garyl

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Thanks Buster1

After some flight testing I have determined the main shaft is in need of more support above the swash. The engineering challenge was finding a way to get the rotating push rods through the stationary shaft support above the swash.
As you can see the space I have to work with is extremely minimal, nothing new with this helicopter.

I came up with an idea to use a thin section bearing and a bushing that attaches to the main shaft with slots in it for the push rods. The bushing secures to the main shaft with set screws and the outer side of the bushing will ride on the bearing.

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10-22-2018 10:22 PM  14 hours agoPost 114
garyl

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While I am changing the design I decided to loose some weight with a set of plastic gears that will handle the required torque load. Naturally they are a little bigger with a mod 2 tooth but have the same pitch diameter, this will insure they will fit in the allotted space.

The new gears only weigh 1.23 lbs. compared to 3.48 lbs. of the steel gears.

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10-22-2018 10:33 PM  14 hours agoPost 115
garyl

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I put my Sherline mill to work again and made the upper bearing block that will support the thin section bearing and main shaft support bushing. The material is 6061 aluminum.

Here are all the new parts for the redesign ready to be assembled.

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10-22-2018 10:48 PM  13 hours agoPost 116
Notar

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Nice!
That should get rid of the vibs on spoolup and down.

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10-22-2018 11:28 PM  13 hours agoPost 117
Jim Ryan

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Cincinnati, OH

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What a cool solution, Gary! I really like this approach, as one of the things that irked me about my Huskie was that the swashes and pitch links made it impossible to fair in the rotor shafts as they would be on a real HH-43. You do great design and fabrication work. I'm really enjoying following along.

Jim

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10-23-2018 02:38 AM  10 hours agoPost 118
ssmith512

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Indianapolis, IN USA

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Love the high level of engineering being displayed in this build! Very nice!

Steve

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