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General control line discussion => Open Forum => Topic started by: Bootlegger on February 05, 2019, 08:05:18 AM

Title: surface deflication indicator
Post by: Bootlegger on February 05, 2019, 08:05:18 AM

  I picked up an old Model Builder and found the deflection indicator made by Tettra , does any one know if they are still in business?

  The magazine is August of '93..

             Thanks a lot...

Title: Re: surface deflication indicator
Post by: George Truett on February 05, 2019, 09:56:10 AM

I think Tettra is still in business because I still see their fuel tanks advertised at Central Hobbies.  I did not see the deflection indicator listed but they show this one: https://www.centralhobbies.com/cat3.php?cat=14&subcat=98

Title: Re: surface deflication indicator
Post by: Tom Vieira on February 05, 2019, 10:09:11 AM

.....?

https://www.ebay.com/itm/GREAT-PLANES-ACCU-THROW-CONTROL-SURFACE-DEFLECTION-METER-HOBBY-FLYING/163282569416?epid=2288042839&hash=item26046648c8:g:S-YAAOSwy-5brYWn

Title: Re: surface deflication indicator
Post by: Perry Rose on February 05, 2019, 11:41:29 AM

Use a piece of paper taped to the fuse. or fin and pencil mark the limits. A protractor will tell the degrees. T.L.A.R. works best.

Title: Re: surface deflication indicator
Post by: Bootlegger on February 05, 2019, 11:43:02 AM

   Thanks guy's, gotta build one soooooon!!!

Title: Re: surface deflication indicator
Post by: Jim Carter on February 05, 2019, 01:57:55 PM

 :)  You must be a really goooood pilot!  I rarely have a plane last long enough to worry about "surface deflection" unless you're referring to the depth of the hole that's left!!  LL~ LL~

Title: Re: surface deflication indicator
Post by: Ken Culbertson on February 05, 2019, 03:11:43 PM

Unless you are trying to measure the differential or bias between the flaps and the elevator (in which case you will need 2), I kinda like Perry's method.  I stopped worrying about how much total control I have (as long as it looks like it is over 30 degrees) when I discovered that I was flying the entire pattern using about 15-20.

I have also come to the conclusion that equal movement of the controls on the ground does not always equate to equal movement in the air.  Now, my only control measurement before trim flights is to make sure the flap horn and bell crank are properly aligned.  The rest is eyeballed untill I see what she wants in the air.

Having said all that, I used to tape two paper thin yellow plastic school protractors that would slip into the flap/elevator gap with 2 Popsicle sticks stuck to the back to slip over the wing and stab and hold them at -0-.  Almost as accurate as the $25 @ professional ones but nowhere near as informative as one test flight.

Ken

Title: Re: surface deflication indicator
Post by: CircuitFlyer on February 05, 2019, 04:07:16 PM

I use a free app on my phone, lots to choose from.

Paul

Title: Re: surface deflication indicator
Post by: Howard Rush on February 05, 2019, 05:19:42 PM

I use something like this: https://www.amazon.com/Johnson-Level-Tool-1886-0000-Magnetic/dp/B00H7HVGES/ref=sr_1_29?ie=UTF8&qid=1549412272&sr=8-29&keywords=wixey

Title: Re: surface deflication indicator
Post by: bobsrc on February 06, 2019, 12:11:30 PM

Sig Mfg. has a deflection indicator that you can check out on their website.  www.sigmfg.com