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Very Hot Topic (More than 25 Replies) Bell UH-1N rubber powered helicopter build. (Read 38013 times)
Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #177 - Apr 21st, 2017 at 5:15pm
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4-21-2017

Thanks Tom,

We shall see what happens next.  Wink

Cheers, Ray K.
  
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Sky9pilot
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Re: Bell UH-1N rubber powered helicopter build.
Reply #176 - Apr 21st, 2017 at 5:00pm
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Looking good Ray.  Can't wait the further tests!!! This is one amazing model!
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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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #175 - Apr 21st, 2017 at 4:58pm
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4-21-2017

Here are the finished rotor blades, each one comes out to 2.6 grams and are fully balanced, I will be mounting these tomorrow and do a tracking test under low power.

Cheers, Ray K.
  

( 75 KB | 11 Downloads )
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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #174 - Apr 20th, 2017 at 3:42pm
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4-20-2017

Thanks Neal,

Rotor blades have been made, I should be ready to try some test runs this weekend.

Cheers, Ray K.
  
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Kerak
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Re: Bell UH-1N rubber powered helicopter build.
Reply #173 - Apr 19th, 2017 at 9:11pm
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Really beautiful model, Ray...I'm totally amazed at your technical creativity.  Smiley

Neal
  
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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #172 - Apr 18th, 2017 at 8:33pm
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4-18-2017

Main rotor blades, 12 inches long each plus main rotor hub and lead lag wires will give me a total main rotor DIA of 28 inches.  Wink

Cheers, Ray K.
  
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Sky9pilot
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Re: Bell UH-1N rubber powered helicopter build.
Reply #171 - Apr 18th, 2017 at 8:00pm
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Great stuff Ray,
What is the diameter of the rotors?
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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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #170 - Apr 18th, 2017 at 4:37pm
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4-18-2017

Here is the video of the Bell power up test, 350 winds, everything looks good.  Smiley

Cheers, Ray K.  https://youtu.be/4ZdQGQZQeNQ
  
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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #169 - Apr 13th, 2017 at 4:01pm
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4-13-2017

Tests today were successful, shafts and transmission worked perfectly,  Cheesy no more issues here, on to making rotor blades. I will post video tomorrow.

Cheers, Ray K.
  
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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #168 - Apr 12th, 2017 at 3:15pm
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4-12-2017

You got that right Tom, all repairs are completed, good as new and I did not forget the steel insert shaft this time around, had to go to work early so I will try another test tomorrow.  Wink

Cheers, Ray K.
  

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Re: Bell UH-1N rubber powered helicopter build.
Reply #167 - Apr 12th, 2017 at 11:33am
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Bummer Ray!
Glad the damage wasn't worse than it was!  I guess I'm gonna have to make a pre-flight check list to make sure I've covered all the bases before stretching that rubber band!!!


Amazing that you've done the IRAN (Inspect Repair As Needed) already and are almost ready to test again.
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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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #166 - Apr 11th, 2017 at 3:42pm
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4-11-2017

Good news is that everything is repairable and has already been repaired, no serious damage was done. The transmission held up just fine. I will be ready to try another power test tomorrow.  Smiley

Cheers, Ray K.
  

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Ray_K
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Re: Bell UH-1N rubber powered helicopter build.
Reply #165 - Apr 11th, 2017 at 3:39pm
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4-11-2017

I did not know that Bob, thanks. I loaded the rubber motor for testing today and that's when disaster struck!

Main rotor shaft bent, ripped out the pulley belt drive from the tail rotor and bent the tail rotor shaft, never had this happen before. I found out that I had forgot to put the stainless steel insert shaft into the main rotor shaft, without this the main rotor shaft bent over like tinfoil.

Cheers, Ray K.
  

( 41 KB | 14 Downloads )
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pb_guy
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Re: Bell UH-1N rubber powered helicopter build.
Reply #164 - Apr 10th, 2017 at 11:31pm
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I use those "loom bands" as clamps, but they deteriorate fairly rapidly, within months.
ian
  
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Sky9pilot
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Re: Bell UH-1N rubber powered helicopter build.
Reply #163 - Apr 10th, 2017 at 8:27pm
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Thanks Ray...always looking for modeling material outside of the Hobby Shop.  I'm sure I've seen them in the Craft Dept of Wally World!
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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