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Very Hot Topic (More than 25 Replies) Helicopter cook up. (Read 13421 times)
Ray_K
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Re: Helicopter cook up.
Reply #28 - Jan 2nd, 2019 at 6:44pm
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1-2-2019

Now start adding formers as shown.
  

( 97 KB | 21 Downloads )
500_c.jpg
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500_d.jpg
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500_e.jpg
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Ray_K
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Re: Helicopter cook up.
Reply #27 - Jan 2nd, 2019 at 6:42pm
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1-2-2019

Ok guy's here we go, I have already built my model to check the plans and parts, just a little tweaking on the plans and I will have them posted on Monday, I will be flight testing this weekend.
I built this model in 3 days so it is as simple as I can get it, very basic structure, just two pulleys to make is the hardest things to make on this and they are really not that hard. I printed all the coloring and markings on tissue with my printer and attacked to model, no painting or shinking of tissue. Here are my construction pictures, rotor DIA is 16 inches. I start off with building two side frames.
  

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shipwreck
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Re: Helicopter cook up.
Reply #26 - Dec 30th, 2018 at 3:59pm
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Hope your feeling better Ray.
I am finally slowing down at work so hope to get back into doing some building.
Paul
  
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Ray_K
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Re: Helicopter cook up.
Reply #25 - Dec 11th, 2018 at 7:09pm
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12-11-2018

Thanks guy's.

Cheers, Ray K.
  
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bigrip74
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Re: Helicopter cook up.
Reply #24 - Dec 11th, 2018 at 6:15pm
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Ray, DITTO what Tom just stated.

Bob
  

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Sky9pilot
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Re: Helicopter cook up.
Reply #23 - Dec 11th, 2018 at 5:51pm
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Lots of viruses going around...take care of yourself.  We can get to the cookup whenever you are able to get back to it.  No pressure!!!
  

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Ray_K
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Re: Helicopter cook up.
Reply #22 - Dec 11th, 2018 at 5:33pm
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12-11-2018

Sorry Guy's been sick for the last 5 days and haven't been able to get these plans on disk yet, going to try and get out Friday to do them. FYI.

Cheers, Ray K.
  
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Ray_K
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Re: Helicopter cook up.
Reply #21 - Dec 10th, 2018 at 7:25pm
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12-10-2018

I was close on this one, who knows I may try it again someday.

Cheers, Ray K.
  
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bigrip74
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Re: Helicopter cook up.
Reply #20 - Dec 8th, 2018 at 3:58pm
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I love the Comet Sikorsky R6, but it does not lend itself to my modest engineering to figure out how to make it fly.
  

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Ray_K
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Re: Helicopter cook up.
Reply #19 - Dec 4th, 2018 at 8:49pm
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12-4-2018

A very interesting concept Strat-o, I don't know if I would want to tackle this one but it does look interesting, I have used pulley drives before and they do work well but you have to be able to get at the belts without to much difficulty. Plans for the 500 are complete I just have to get them on disk and we can start building, should have them posted here on Monday.

Cheers, Ray K.
  
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strat-o
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Re: Helicopter cook up.
Reply #18 - Dec 3rd, 2018 at 9:47pm
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I have come up with a possible solution to making a rubber powered helicopter easier to manage and enhances flexibility of design.

In the drawing the rubber motor follows the dashed line.  It is routed from the main drive pulley to pulley 2, pulley 3, pulley 4, then tied off.  The rubber wraps around the main drive pulley in a similar manner as old audio tape.  The pulleys on the side evenly distribute the pull and stretch of the rubber. 

Advantages: Since there is minimal rubber to rubber contact, no lubrication should be required.  Arbitrarily long rubber may be used so long as there is a sufficient number of pulleys for rubber routing.  The drive pulley can be located anywhere as desired.  For twin-rotor  helis two drive pulleys can be used.  Main drive pulley diameter can be changed to adjust for torque requirements.

Disadvantages or issues to overcome:  Replacing the rubber would be a pain. Also rubber wrapping around main drive pulley might get too large to manage but it's possible to use thin strong line like dental floss instead.  Stretch winding might be feasible but difficult to manage. (If cord is used, stretch winding solves itself). Pulleys add weight.

Marlin
  

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Ray_K
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Re: Helicopter cook up.
Reply #17 - Nov 13th, 2018 at 7:50pm
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11-13-2018

Hi Marlin, Paul, I have been out of the loop for awhile myself, Marlin to answer you question, multi-bladed rotors work just as well, they create more drag but I have made 4 bladed helicopters fly so yes this design can be made with 4 or five blades, have at it, Paul I am looking to get the plans finished by next week so as soon as I post them the build can start.

Cheers, Ray K.
  
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shipwreck
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Re: Helicopter cook up.
Reply #16 - Nov 13th, 2018 at 7:16pm
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Hi ya Ray,
Well I've been out of the loop for a spell. Is the cook starting soon.?
Hope your well
Paul
  
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Brad
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Re: Helicopter cook up.
Reply #15 - Nov 9th, 2018 at 4:18pm
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I'll give it a whirl.  I'm in  Smiley
  

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strat-o
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Re: Helicopter cook up.
Reply #14 - Nov 9th, 2018 at 4:11pm
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Hi Ray, what about the feasibility of modifying this design to run a 4 or 5 multi-blade rotor?  I assume the two bladed rotor is going to be more efficient but wonder what your experience has been with more blades in terms of comparative flight times.

Marlin
  
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