About this Plan
Grmzpf. Control line Rat Racer model for 5 - 6.6 cc engines.
Quote: "A 36 inch wingspan control line Rat Racer for 5 - 6.6 cc engines. Designed and developed in the USA by Don Burke.
A LONG scientific dissertation could be written on the methods used to arrive at the design of GRMZPF (pronounced Grim-Zipf). However suffice it to say that it was evolved over a period of 8 years through the method of 95% trial and error and 5% brain power. Through most of the process it's worked on the premise that if it looks good, it'll fly! This, coupled with some disastrous experiences with 80 sq in bricks and some success with FAI Team Racers, has allowed me to evolve a config-uration that even the most inexperienced pilot can handle and look like a veteran.
I have built nine of this basic design airplane, changing only the wing and horizontal tailplane area to date. All, with one exception, were excellent flying models and have drawn praise from everyone who has flown them as well as piling up an exceptional record. The best performance to date was a 5:21 in a 140 lap race turned in by Dan Jones and Bernie Tautz at a contest near. Bakersfield, California, this past summer. Someone once said: it's what's up front that counts, and as far as the K&B .40 is concerned it has more power, right out of the box, than anyone has ever seen in this type of engine before.
Start construction with the hardwood parts, cut to length, mark the centre and taper the 3/8 sq main wing spar and 3/8 x 1/4 in leading edge to 1/8 thickness at the tips from a point 2 in each side of centre on what will be the top surface of the wing. Cut two pieces of 3/16 plywood..."
Grmzpf from Aeromodeller, August 1967.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsI'm sure I've seen other stuff on the Grmzpf.... Yes, I posted some things that I'd found, at https://www.rcgroups.com/forums/showthread.php?1530258-Control-Line-Team-Racer-plans-and-pictures/page7#post20111857
- another article
- pics including a version built as a Class B racer
Pertti M - 03/06/2022
Add a comment
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
© Outerzone, 2011-2022.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.