RF Cafe Homepage

Search AAR WebsiteSearch Airplanes and Rockets Website

 Copyright 2007-2030

Articles & Plans

Airplanes | Rockets | Kits

Boats | Cars | Trains

Helicopters | Electronics


Host: Kirt Blattenberger

AMA 92498 | KB3UON

Sitemap | About AAR

Homepage Archive

Building & Flying 

Hints & Tips

Balsa | Airfoils

Silkspan & Dope

Engines & Motors

Air Modeling

C/L Capers | Ads

Model Rocketeer

Jetex | Cox | CO2

Personal Stuff

My Models | Radios


Astronomy | Peanuts

Suzy Homemaker

Parole Plaza | Photos

Just for Fun 

Comics & Humor

Crosswords | Stories

Vintage Magazine Articles 

American Modeler | Air Trails

American Aircraft Modeler

RC Modeler | Flying Aces

Boy's Life | Young Men

Saturday Evening Post

Pop Science | Pop Mechanics

Pop Electronics | Aero-Modeller

A Few Items for Sale

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.

Model Aviation Magazine, AMA - Airplanes and Rockets

About Airplanes & Rockets 

Kirt Blattenberger, Webmaster - Airplanes and RocketsKirt 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 ...

Copyright 1996 - 2030

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the Airplanes and Rockets website are hereby acknowledged.

Webmaster:                         Family Websites:

Kirt Blattenberger                 RF Cafe

BS Electrical Engineering       Equine Kingdom

Amateur Radio KB3UON

Model Aircraft Museum, AMA - Airplanes and Rockets