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Manu's Avid C

36 posts in this topic

Posted

Working on trim : Ray allen servo with a 0$ switch coming from Peugeot 205 electric window switch, tested it, works perfectly, i do not have the level gauge but i assume a visual check neutral in preflight.

the servo will be inserted and bolted on a wood plate i made before covering

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the tab is an assembly of a piece of trailing edge riveted with a U sheet

 

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Posted

Looks good ,will there be a travel limit so if in the unlikely event of a stuck switch runaway you can still fly the plane?With the electric window switch,is the load limit built into the switch or is it somehow in the mechanism .This probably isn't an issue with the trim but I have often wondered if they could be used to control an ivo prop.

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Posted

the end of course is in servo , it stops automatically in the two directions

on the allen paper, they say put 1amp fuse on the line, that's all. btw ray allen switch is very near mine. it's mechanical switch inverter

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Posted

Brilliant work on the wings!  On the cowl bulge, I was contemplating making one, but find myself pulling a spark plug  or two to clear off oil almost every time I fly, as otherwise I have a hard time hand-starting the engine.  In my view this is the chief disadvantage of the inverted engine, at least burning premix.  I now am just going to leave that hole in my cowl to allow front-cylinder spark plug access without cowl removal.   I agree that the gap between flaperon leading edge and wing trailing edge is not optimal aerodynamically, but may be necessary for folding.  

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Posted (edited)

it takes time .. but .. finally trim is done :  with car glass switch, it works perfectly. i used rc plane connections and wire so i can easily disconnect trim from elevator and stab from fuselage.

the switch is on panel near the throttle command, so i can activate it with only a finger without pull hand from command. same for radio red button. allowing   to use them with no matter if pilot is left or right side 

 

 

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Edited by efil 01

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Posted

Very well done!  I look forward to your flight testing, with your improved wings, and this excellent trim installation!  I suspect that the standard Avid trim tab is bigger than it needs to be, so it will be very interesting to see if your "add-on" tab approach works adequately.  I have only a stick-force mitigation setup, similar to JimChuk's, which almost works, but there's no substitute for a real trim system..

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Posted (edited)

thx turbo, we already have talk here about trim:

the diff between real tab and stick force mitigation is in case of broken linkage , with tab you can keep control on flying.

 

Edited by efil 01

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Posted

Working on water lines. the water lines are made with inox bending tubing, it is miraculous how you can fit it anywhere you want, i recommend use this on our little plane, approx 20 euro per meter, i needed 2 meters

 

IMG_3408.thumb.jpg.664245a93ead090753639

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Posted

Love this idea for tubing! Anybody out there know where we can get that in the states?

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Posted (edited)

Good point on trim vs stick-force mitigation.  My concern regarding trim setup comes from realization that elevator is not balanced - all area is behind the hingeline.  If your trimtab is too small, deflection for landing approach trim may be large, or you may be unable to trim to final approach speed with CG fully forward.  Of course, more trimtab span is available if what you have is insufficient.  I expect that you will be o.k., as I believe the mark 4 tab is bigger than it needs to be.   If your setup is successful I might just do something similar.  

Edited by Turbo

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