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Very Hot Topic (More than 25 Replies) Helicopter cook up. (Read 13422 times)
strat-o
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Re: Helicopter cook up.
Reply #43 - Jan 14th, 2019 at 3:49pm
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If a new design seems the best solution, how about a Kaman configuration?  Like maybe a Husky or a K-max?  You would be able to run two rubber bands.  For rotor synchronization you might consider pulleys with the thread running in a figure 8?
  
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strat-o
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Re: Helicopter cook up.
Reply #42 - Jan 14th, 2019 at 3:35pm
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Would it be feasible to add a little more bite by making the tail rotor four-bladed and maybe increasing the diameter a bit?  Oh and maybe, possibly reducing the diameter of the tail rotor pulley?  I realize this is a moving target because as the tail rotor gets fed more power, the main rotor's power diminishes so you wind up chasing your tail to find a happy equilibrium.

Marlin
  
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Ray_K
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Re: Helicopter cook up.
Reply #41 - Jan 14th, 2019 at 3:02pm
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1-14-2019

Sorry guy's, this model was such a dismal failure, direct drive is not the way to go, so much power has to be used to get the rotors up to flying speed even thou this model only weighs 24 grams and so much torque is produced by the main rotors that the tail wheel rotor can not compensate for it so the model lifts off quickly and spirals right into the ground. I will have to come up with something else, I do have an idea but I will have to test this out first before offering it.

Cheers, Ray K.
  
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shipwreck
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Re: Helicopter cook up.
Reply #40 - Jan 6th, 2019 at 5:44pm
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Looks good Ray. Looking forward to building it.
Paul
  
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Ray_K
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Re: Helicopter cook up.
Reply #39 - Jan 3rd, 2019 at 5:04pm
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1-3-2019

Bob I will post plans here on Monday, we are having a cook up on this, this is a very easy model to build, I built mine in 3 days.

Cheers, Ray K.
  
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bigrip74
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Re: Helicopter cook up.
Reply #38 - Jan 3rd, 2019 at 4:15pm
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Ray, you make it look easy, but I know that it aint so.

Did you share the plans for this helicopter? If so I missed it or don't remember.

Bob
  

IF IT AINT BROKE DONT FIX IT!
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Ray_K
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Re: Helicopter cook up.
Reply #37 - Jan 3rd, 2019 at 3:32pm
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1-3-2019

Here are the main rotor blades, the wire loop you see on top of the main rotor hub is used to pin for stretch winding, don't forget to open this area in the tissue for access to the rubber motor hook.

Cheers, Ray K.
  

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Ray_K
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Re: Helicopter cook up.
Reply #36 - Jan 2nd, 2019 at 9:00pm
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1-2-2019

I just had to put a rocket launcher on mine, with main rotor blades on and balance weight total all up weight is just 24 grams, she is 18 inches long so she should have no issues flying.  Wink

Cheers, Ray K.
  
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Ray_K
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Re: Helicopter cook up.
Reply #35 - Jan 2nd, 2019 at 7:43pm
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1-2-2019

Main rotor pictures tomorrow.

Cheers, Ray K.
  
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Ray_K
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Re: Helicopter cook up.
Reply #34 - Jan 2nd, 2019 at 7:43pm
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1-2-2019

Finish tail fin assembly and cover, all tail fin parts are made from 1/32" balsa, then make tail rotor and tail rotor pulley assembly as per plans.
  

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Ray_K
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Re: Helicopter cook up.
Reply #33 - Jan 2nd, 2019 at 7:29pm
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1-2-2019

More tissue covering photos and structure details.
  

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Ray_K
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Re: Helicopter cook up.
Reply #32 - Jan 2nd, 2019 at 7:15pm
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1-2-2019

Finish any remaining cross members to complete fuselage structure and start covering, note some parts of fuselage are not covered.
  

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Ray_K
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Re: Helicopter cook up.
Reply #31 - Jan 2nd, 2019 at 7:10pm
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1-2-2019

Finish up motor stick assembly with 0.25 wire and main rotor hub, check pulley for wobble and install into fuselage at location shown.
  

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Ray_K
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Re: Helicopter cook up.
Reply #30 - Jan 2nd, 2019 at 7:04pm
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1-2-2018

Make tail fin, skis, pulleys and motor stick assembly, pulleys are made with a balsa core of 2 balsa disks per each pulley, 1 is 1/16" balsa and 1 is 1/32" balsa of the proper DIA shown on plans, the pulley faces are made out of 0.10 plastic styrene sheet 1/16" larger in DIA than the pulley cores. Each pulley core is faced with very fine sandpaper before pulley faces are glued on, bore of pulleys is 1/16" DIA and a 1/16" DIA aluminum tube is glued into the center of each pulley.
  

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Ray_K
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Re: Helicopter cook up.
Reply #29 - Jan 2nd, 2019 at 6:47pm
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1-2-2019

Make landing gear wire and attach to gear formers and start adding the rest of fuselage formers, cross members, and balsa sheeting to areas shown.
  

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