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Very Hot Topic (More than 25 Replies) Helicopter cook up. (Read 9604 times)
Ray_K
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Re: Helicopter cook up.
Reply #54 - Jan 17th, 2019 at 4:27pm
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1-17-2019

I would like to see what you come up with Marlin.

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strat-o
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Re: Helicopter cook up.
Reply #53 - Jan 17th, 2019 at 12:04pm
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I've got a solution in mind for a Kaman design.  Will start on that.

Marlin
  
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Ray_K
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Re: Helicopter cook up.
Reply #52 - Jan 16th, 2019 at 3:42pm
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1-16-2019

I am redoing the tail assembly and pulley, a few bugs to work out, should be ready to try flights again by the weekend. I want to make sure this works before posting the plans for you guys.

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Ray_K
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Re: Helicopter cook up.
Reply #51 - Jan 15th, 2019 at 8:25pm
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1-15-2019

I might Bob, you never know.  Wink

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bigrip74
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Re: Helicopter cook up.
Reply #50 - Jan 15th, 2019 at 7:58pm
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Nice looking Piasecki I hope that you draw up a full bodied version also.

Bob
  

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Ray_K
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Re: Helicopter cook up.
Reply #49 - Jan 15th, 2019 at 3:50pm
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1-15-2019

Bob I did not post the plans yet, but will so you guy's can have a go at it, I need to make some corrections to it first, Tom I am still tinkering, I tried reducing the main rotor blade pitch but that did not help, I am going to make a way smaller tail rotor pulley, this one is 1/2" DIA, I will try 1/4" DIA and post results, I am drawing up a NO-Cal Piasecki Retriever Tandem helicopter for you guys to build, no pulleys, just 2 motor sticks, simple rotor hubs, fixed pitch, I should have the prototype built by the weekend and we shall see.

Cheers, Ray K.
  

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Sky9pilot
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Re: Helicopter cook up.
Reply #48 - Jan 15th, 2019 at 1:28pm
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Ray,
I'm in no way helicopter builder but was wondering if the angle of attack of the main rotor blades could be reduced thereby reducing the tork of the main rotors and still provide enough lift for flight.  Just a thought? 
I really like the original suggested model helicopter you made the prototype of.  Good looking model.  I look forward to more progress on this.  I'm looking forward to building a heli!
  

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bigrip74
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Re: Helicopter cook up.
Reply #47 - Jan 14th, 2019 at 9:35pm
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Ray, I did not look else where to see if you posted the plans yet.

Bob
  

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shipwreck
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Re: Helicopter cook up.
Reply #46 - Jan 14th, 2019 at 7:43pm
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Cool Ray
I'm finally getting some build time. Can't wait to see what ya come up with.
Paul
  
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Ray_K
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Re: Helicopter cook up.
Reply #45 - Jan 14th, 2019 at 7:31pm
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1-14-2019

As a side note when I remove the main rotor blades and run with just the tail wheel running there is plenty of force coming from the tail wheel to push the fuselage counter clockwise very quickly just not enough with the main rotor blades on, too much torque is being generated by the main rotors, again something I am going to have to tinker with, I want something that is going to work for you guy's the first time around without a lot of fiddling. I am thinking in the lines of a NO- Cal direct drive tandem helicopter.

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Ray_K
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Re: Helicopter cook up.
Reply #44 - Jan 14th, 2019 at 7:10pm
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1-14-2019

On this 500 model I can not increase the tail rotor DIA the tail assembly is in the way, I will try a smaller tail wheel pulley and see if this helps, if I add more blades it will increase the weight in the tail and more nose weight will be needed, the tail wheel blades are pitch adjustable, adding more pitch did not help, A Kaman is a good idea but again the rotors will clash if they are not synchronized, this would require gearing, pulleys will not work because of the outward angle of the rotors so pulley grooves will not line up because the pulleys attached to the main rotors will be at angles. I will tinker with the 500 to see what happens.

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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.

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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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