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Bell UH-1N rubber powered helicopter build. (Read 33244 times)
Reply #192 - Jun 2nd, 2017 at 4:55pm

Ray_K   Offline
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6-2-2017

Thanks Bob, still work to do but I am close, I might need to down size the models a little bit and KISS, maybe more towards semi-scale simplified. More to come.  Wink

Cheers, Ray K.
 
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Reply #191 - Jun 1st, 2017 at 10:35pm

bigrip74   Offline
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WOW! Smiley all I can think of is the engineering you've put in this heli. Nice job.

Bob
 

IF IT AINT BROKE DONT FIX IT!
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Reply #190 - Jun 1st, 2017 at 5:02pm

Ray_K   Offline
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6-1-2017

Maybe rubber powered helicopters are not meant to be this big, at least geared ones anyway. I went for another flight test, put 500 winds in her and the transmission slipped, under lower torque, no problem, under higher torque the gearing slips, no damage to the gearing so it is just slipping, the miter gear box held up just fine.
I will have to look into gearing that have deeper teeth to prevent slippage. Back to the drawing board.  Tongue I will post a video of this as soon as I can.

Cheers, Ray K.
 
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Reply #189 - Jun 1st, 2017 at 7:46am

staubkorb   Offline
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Looks really encouraging, Ray! Smiley
You might want to add some kind of a tail skid to protect the tail rotor...

Pete
 

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Wonderful Wacky World of Free Flight
(with a bit of rc thrown in for giggles)

Comparing Spammers to a pile of organic waste is an insult to the organic waste!
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Reply #188 - May 31st, 2017 at 10:21pm

Ray_K   Offline
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5-31-2017

Here's the video, more to come.

Cheers, Ray K.

https://youtu.be/A7ef86svkBk

 
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Reply #187 - May 31st, 2017 at 9:25pm

Ray_K   Offline
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5-31-2017

Hi Tom,

This was a very brief lift off but oh man was it neat, a hop not a flight yet but more winds tomorrow and she will be in flight then. My helicopters always land with power still in them so no auto-rotation needed.  Wink

Cheers, Ray K.
 
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Reply #186 - May 31st, 2017 at 5:47pm

Sky9pilot   Offline
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Fantastic Ray Smiley

I assume that once the rubber motor runs down she just auto rotates to a landing?  Never seen a real rubber powered Free Flight helicopter flight!
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #185 - May 31st, 2017 at 4:12pm

Ray_K   Offline
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5-31-2017

We have lift off, during another power test, double loop of 3/16" rubber 1 and a 1/4 peg to hook and only 300 hundred winds and she lifted off the counter and I caught it, needs more balancing and there's some clicking noise coming from the pinion gear or spur gear, not sure which, will do another more daring test tomorrow I will down load this video as soon as I can but it fly's!  Cheesy

Cheers, Ray K.
 
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Reply #184 - May 7th, 2017 at 4:22pm

Ray_K   Offline
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5-7-2017

Here's the ridged rotor hub, no lead lag hinges and no feathering pin, the fly bar is there just for looks and is not functional. I will do another low power test to see what happens next.

Cheers, Ray K.
 

Bell_X.jpg (71 KB | )
Bell_X.jpg
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Reply #183 - Apr 26th, 2017 at 3:55pm

Ray_K   Offline
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4-26-2017

Thanks Tom, I did not think of that, I will have to check them out.

Cheers, Ray K.
 
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Reply #182 - Apr 26th, 2017 at 1:13am

Sky9pilot   Offline
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Ray,
You might want to find some "Dental Rubber Bands"  They're the kind used for braces and they keep the tension well and are pretty durable.  Usually can be found in the Drug Store or the Drugstore section of Walmart and other chain stores.
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #181 - Apr 25th, 2017 at 4:20pm

Ray_K   Offline
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4-25-2017

PB you were right those loom bands deteriorate very rapidly, I had both tension cords just fall apart and break while the model was just sitting there, these will not do, I will have to find a suitable replacement for these, we can not have these falling apart during operation.  Wink

Cheers, Ray K.
 
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Reply #180 - Apr 24th, 2017 at 6:36pm

Ray_K   Offline
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4-24-2017

Thanks Tom, I hope so.

Cheers, Ray K.
 
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Reply #179 - Apr 24th, 2017 at 4:52pm

Sky9pilot   Offline
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She's outstanding Ray...she has to fly well looking as good as she does!
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #178 - Apr 24th, 2017 at 4:34pm

Ray_K   Offline
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4-24-2017

She is ready to fly, well test anyway, I did not put the glass on yet but we are ready to give her a try, we will see what happens in the next day or two.

Cheers, Ray K.
 
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