Author Topic: 1/4 Scale Ka3 Controls  (Read 874 times)

billscottni

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1/4 Scale Ka3 Controls
« on: February 08, 2020, 13:18:11 PM »
Finishing up my Island models 1/4 Scale Ka3 and wondering how people are controlling their ruddervators?

Pushrods
Snakes
Closed loop

Maybe wing servo's "in" the tails

What's the best option?

rogallo

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Re: 1/4 Scale Ka3 Controls
« Reply #1 on: February 08, 2020, 15:21:51 PM »
Snakes in a Plane!
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rogallo

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Re: 1/4 Scale Ka3 Controls
« Reply #2 on: February 08, 2020, 15:23:09 PM »
Bill, I am using snakes but they are a bit sloppy.  Mind you that is the 1/3 scale one
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Re: 1/4 Scale Ka3 Controls
« Reply #2 on: February 08, 2020, 15:23:09 PM »

billscottni

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Re: 1/4 Scale Ka3 Controls
« Reply #3 on: February 09, 2020, 12:10:41 PM »
Bill, I am using snakes but they are a bit sloppy.  Mind you that is the 1/3 scale one

Not a great fan of snakes unless they can be properly supported along their length, even then the trim can vary with temperature. Seriously considering putting 2 wing servo's in the tails for more direct control

rogallo

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Re: 1/4 Scale Ka3 Controls
« Reply #4 on: February 09, 2020, 12:31:16 PM »
Go for it, Fred said the model could do with a bit more weight for penetration.
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billscottni

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Re: 1/4 Scale Ka3 Controls
« Reply #5 on: February 09, 2020, 13:52:29 PM »
20 - 25g extra at rear is probably going to be 100 -150g at the nose so not too bad and control authority should be improved

erwan

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Re: 1/4 Scale Ka3 Controls
« Reply #6 on: February 19, 2020, 20:27:51 PM »
I use sullivan pushrod on mine.
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billscottni

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Re: 1/4 Scale Ka3 Controls
« Reply #7 on: February 20, 2020, 10:49:05 AM »
Thanks Erwan

gerryb

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Re: 1/4 Scale Ka3 Controls
« Reply #8 on: February 22, 2020, 23:30:19 PM »
Hi Bill,
I used Sullivan blue/yellow snakes in my 1/4 sc model and 'servo in tailplane' in my 1/3 sc model and they both work equally well as far as I'm concerned.
I have the snakes well supported along their length, so there's no slop or play to speak of.
I would suggest the red/yellow snakes are too flexible, while the black/yellow ones are too stiff for a fairly small model.
I can put up some photo in the next day or two if it would help.
 regards,
GerryB

Fred

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Re: 1/4 Scale Ka3 Controls
« Reply #9 on: February 23, 2020, 11:49:12 AM »
Hi Bill,

Same for me, Sullivan snakes :)
Works a treat, but nothing stop you putting servos in the tail like the 1/3 version one :)

I saw your message also ;)
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billscottni

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Re: 1/4 Scale Ka3 Controls
« Reply #10 on: February 23, 2020, 13:36:22 PM »
Thanks Fred. Now i'm completely undecided!! I'd convinced myself servo's in the tail was the ay to go, but it woul drequire some surgery on the already built tails. I have sullivan snakes in the garage, so may go that route

gerryb

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Re: 1/4 Scale Ka3 Controls
« Reply #11 on: February 24, 2020, 13:42:46 PM »
Hi Bill,
Some photos as promised....

gerryb

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Re: 1/4 Scale Ka3 Controls
« Reply #12 on: February 24, 2020, 13:46:29 PM »
Snakes cross over inside fuse to keep runs as straight as possible, the right hand servo operates the left hand V tail. GB