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"Prototype T.D. .010 c.1960"



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Cox Skycopter Free Flight Helicopter

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Thinking Cox Skycopter Free Flight Helicopter

Post  MauricioB on Sun Dec 03, 2017 10:28 pm

Hello, does anyone have the COX .020 SKYCOPTER FREE FLIGHT HELICOPTER ??
I'm interested in how the blades work.
I understand that each blade has a balance to give degrees to each blade that interact with the speed of rotation.
I would like to know how much each shovel measures, in width and length.
The degree of inclination, maximum and minimum of each blade.
There's nothing like that here and it would be a nice project later on.
All information will be welcome!

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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  batjac on Sun Dec 03, 2017 11:31 pm

Mauricio,  there are a few 1/2A free flight helicopters over on Outerzone that you can build:

This one is what actually first brought me to the CEF years ago: https://outerzone.co.uk/plan_details.asp?ID=3476


And others:
https://outerzone.co.uk/plan_details.asp?ID=5723
https://outerzone.co.uk/plan_details.asp?ID=6713
https://outerzone.co.uk/plan_details.asp?ID=6625
https://outerzone.co.uk/plan_details.asp?ID=3476

The Whirly Mark
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  Ken Cook on Mon Dec 04, 2017 4:13 am

The Cox Skycopter  was my fav Cox flying model. It worked and it worked too well. I lost many of them. I had probably around 10 of them and I now have one relatively new in the box. A very powerful flying heli which usually flew far too high and in these parts your not getting it back. It suffered a few issues such as the blades warping and the rotating portion would tend to give way on hard landings due to it's weight above the pivot. It's been in my garage for years and I've been meaning to dig it out. Ken
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  MauricioB on Mon Dec 04, 2017 5:12 am

batjac wrote:Mauricio,  there are a few 1/2A free flight helicopters over on Outerzone that you can build:

This one is what actually first brought me to the CEF years ago: https://outerzone.co.uk/plan_details.asp?ID=3476


And others:
https://outerzone.co.uk/plan_details.asp?ID=5723
https://outerzone.co.uk/plan_details.asp?ID=6713
https://outerzone.co.uk/plan_details.asp?ID=6625
https://outerzone.co.uk/plan_details.asp?ID=3476

The Whirly Mark

Hello, thanks for sharing this information, it is very useful when checking what can be done. I'll take those plans into account the moment I decide to do something ... thank you, friend!
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  MauricioB on Mon Dec 04, 2017 5:16 am

Ken Cook wrote:The Cox Skycopter  was my fav Cox flying model. It worked and it worked too well. I lost many of them. I had probably around 10 of them and I now have one relatively new in the box. A very powerful flying heli which usually flew far too high and in these parts your not getting it back. It suffered a few issues such as the blades warping and the rotating portion would tend to give way on hard landings due to it's weight above the pivot. It's been in my garage for years and I've been meaning to dig it out. Ken

10 of them? .. wow! ... cheers
Have any chance to take the trouble to photograph yours and tell me please the measures:
Total Length of Fuselage
Location of the rotor from the tail (measured)
Length and width of the blades.
Diameter of the blades.
Total weight of the model.
Maybe for a future project that information would suit me ... it is not necessary now, only when it is convenient to do so.
Thank you!
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  roddie on Mon Dec 04, 2017 9:57 am

Hi Mauricio, I never had a Cox helicopter.. but I can provide some photos to help see the models' design and angle of the rotor-blades.

Cox Sky Copter;






Cox also made .049 powered examples..

Cox Sky Jumper;





Cox Sky Ranger;






Cox Attack Cobra video; (FUNNY KID!!)

https://www.youtube.com/watch?v=1_WNlBNYG7U







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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  Oldenginerod on Mon Dec 04, 2017 3:05 pm

Obviously the blades must flip flop from a positive attitude to a negative attitude once the engine cuts out so it can autorotate. Just can't quite get my head around how that happens.
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  dckrsn on Mon Dec 04, 2017 7:59 pm

Rod, I tried to photograph the business end of a blade that
would make sense, but no good. Anyway, the blade rocks
back and forth on the mount wire. There is also a weight
on the blade end to help maintain the proper pitch in climb.
I'll try to photograph again tomorrow, in daylight.
Bob
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  Oldenginerod on Mon Dec 04, 2017 11:55 pm

dckrsn wrote:Rod, I tried to photograph the business end of a blade that
would make sense, but no good. Anyway, the blade rocks
back and forth on the mount wire. There is also a weight
on the blade end to help maintain the proper pitch in climb.
I'll try to photograph again tomorrow, in daylight.
Bob

Thanks Bob. I'd sort of figured out that the blade must rock once the engine cuts out to give it the opposite attitude to when climbing. Otherwise it would need to change direction of rotation to auto-rotate for the decent. Without one in front of me, I just can't figure out how the counter-weight makes it swing from one angle to the other.
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  batjac on Mon Dec 25, 2017 12:06 am

Mauricio, here is a design that was just posted on Outerzone:



https://outerzone.co.uk/plan_details.asp?ID=9590


The Breaking News Mark
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  MauricioB on Fri Dec 29, 2017 12:18 am

batjac wrote:Mauricio, here is a design that was just posted on Outerzone
The Breaking News Mark

Thank you very much for providing this new information, I am still grouping information.
Thanks again! Thumbs Up
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  MauricioB on Fri Dec 29, 2017 12:28 am

MauricioB wrote:


Friends, is my perception wrong or do the big shovels spin with a negative step Shocked ??????
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  getback on Fri Dec 29, 2017 7:13 am

If you look close at the beginning he is using a starter spring and when rotors start turning they are going in the same direction / as the body does too when turned loose . Cold
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Thinking Re: Cox Skycopter Free Flight Helicopter

Post  batjac on Wed Jan 24, 2018 1:22 am

And another one just went up...

https://outerzone.co.uk/plan_details.asp?ID=9709



The Update Mark
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Thinking Re: Cox Skycopter Free Flight Helicopter

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