SMALL - Telemetry SMALL - Radio
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Old Apr 25, 2015, 11:07 PM
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Got it... here are the links... note I've used ball joint connectors on all my builds where the angles are not true with the servo throws... thanks joeg

http://www.rcgroups.com/forums/showp...postcount=3924
http://www.rcgroups.com/forums/showp...postcount=3906
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Old Apr 26, 2015, 12:39 PM
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This may be a double reply. The first one didn't show. Gibjoe, ball links are a good idea. They help to relieve pressure on the servos.
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Old Apr 26, 2015, 12:45 PM
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Test from cell phone
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Old Apr 26, 2015, 05:23 PM
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Note also... if you check the pics in my previous link..you'll see that I used Du-Bro hard plastic swivel hinges for all my control surfaces... the "attached" foamy hinge arrangment that came with the kit is very very weak and will start to tear across the length when the control is under stress..
Using some swivel hinges insures a more friction free movement and is solid... I don't get any servo chatter at all with these hinges... just a suggestion.... also... if you can get a rudder servo hooked up thats all the better for you.... I loved my t47 and it flew great.... don't have any clips of it ..sorry to say.... joeg
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Old Apr 26, 2015, 08:47 PM
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Thanks for the suggestions gibjoe
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Old Apr 27, 2015, 07:18 PM
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One reason I NEVER link twin Elevator servos is that no two servos are exactly the same. Even the geometries of pushrods, horns etc are not identical usually.
This means it you drive both servo 'equally' the outcome is unlikely to be equal in Elevator Angle. And/or travel across the range.
Thus I always use individual RC Channels per servo, and then can fine tune them to track each Elevator perfectly. In some case using a TX Curve if it needs that.
I do the same for Flaps on Aircraft.

Most people are not going to recognise or know it is amiss.... they will just use Aileron (Roll) to correct any Elevator/Flap mismatch error.
But in worse cases it will be noted, and more annoying effort to correct yourself.

It also allows adding Taileron operation if you want to clean up the Roll axis, or have more authority. (Even if the full scale never had that - no one will know! lol)
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Old Apr 28, 2015, 01:44 AM
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I totally agree with PeterVRC ... IF talking about using servo reverser..... because they are notorious for stepped operation. Meaning one is stepped, while other is smooth and this can lead to mismatch through range until full deflection.

But an item that can work is use of a V tail mixer. Yes - this is stepped as well - but now BOTH servos are stepped and you only connect the elevator function.

Nigel
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Old Apr 28, 2015, 01:49 AM
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Hey, that is a pretty good idea!!
If you want to save a channel - though it is not quite as good as individual control still. But probably the best 'second tier' idea! I will have to try one out on something!
Probably even the T-45!!

Oh!... they also cost money! hehe
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Old May 10, 2015, 08:59 AM
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I finally replaced the original vertical stabilizer and rudder with a balsa wood one. I hope it is more durable than the delron. There should be a law against using that stuff in planes. I have limited space and it's too easy to touch these planes up against something.
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Old May 15, 2015, 08:57 PM
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Quote:
Originally Posted by oldsneakers View Post
I finally replaced the original vertical stabilizer and rudder with a balsa wood one. I hope it is more durable than the delron. There should be a law against using that stuff in planes. I have limited space and it's too easy to touch these planes up against something.
I agree those tail feathers are too flimsy, even reinforced with CF.. they're just itching to fail.
Grats on going with Balsa! I need to do the same when I build up my next Sapac/HK T-45.
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Old May 16, 2015, 02:26 AM
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As many already found out - Sapac T45 is old style foam ..... others have moved on from that years ago. Except Multiplex of course ....

The Lanyu T45 is much better foam than the Sapac but still suffers from stupid bits like paper thin nose cone ....

Sadly HK stopped selling the Lanyu version when it was passed to VolantexRC and price shot up ! It used to be $29.99 for the kit - an absolute steal at the price !

Nigel
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