About Airplanes & Rockets

Kirt Blattenberger, Webmaster - Airplanes and Rockets
Kirt Blattenberger
Carpe Diem!
(Seize the Day!)

Even during the busiest times of my life I have endeavored to maintain some form of model building activity. This site has been created to help me chronicle my journey through a lifelong involvement in model aviation, which all began in Mayo, MD. There is a lot of good information and there are lot of pictures throughout the website that you will probably find useful, and might even bring back some old memories from your own days of yore. The website began life around 1996 as an EarthLink screen name of ModelAirplanes, and quickly grew to where more server space ...

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Copyright 1996 - 2016
Webmaster:
Kirt Blattenberger
BSEE - KB3UON
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Modeling Resources

Academy of Model Aeronautics (AMA) - Airplanes and Rockets
Academy of Model Aeronautics

Tower Hobbies logo - Airplanes and Rockets
Tower Hobbies

Horizon Hobby logo - Airplanes and Rockets
Horizon Hobby

Brodak Manufacturing - Airplanes and Rockets
Brodak Mfg.

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Great Planes Nylon Control Horn Flaw

Great Planes medium control horn manufacturing flaw - Kirt Blattenberger

I have written to Great Planes about what I believe is a manufacturing flaw in their medium size nylon control horns, but get no response from them other than to mail the parts to them. I believe the backing plate has a mirror image molding such that in order for the plate to be aligned properly with the main control horn holes, the plate would have to be installed upside-down. That places the reinforcement bumps down into the control surface, which deforms the surface. The pictures to the left should make clear what I am talking about.

Great Planes medium control horn manufacturing flaw - Kirt BlattenbergerThe control horn on the left in both the upper and lower images has the backing plate installed with the reinforcement bumps facing away from the control surface - the proper method. However, this forces the backing plate to be skewed in alignment relative to the main control horn part. The control horn to the right in the upper and lower images show that the only way to obtain proper alignment is to install the backing plate with the reinforcement bumps facing into the control surface. Doing so crushes the surface, and if the balsa is very hard or plywood is in the control horn mounting area, the backing plate ends up sitting on the bumps. This is clearly not the way it should be.

Other size GP control horns do not exhibit this problem. It is totally unbelievable that I first contacted them about three years ago and they still ship them like this. If you have seen the same thing and believe the parts are molded improperly, please send me an e-mail at the above address. I will collect the opinions and send them to Great Planes.