NMPRA

Test flew a couple of new Sharks at Whittier today.

Super Shark. Made in USA

There is no magic set-up. There are very different combinations that can produce the same results. Example: A .191 & .020 engine running a higher pitch propeller could go sub-minute. A .198 & .024 engine could also go sub-minute. The pitch in any propeller is measured in inches which means for every...

I would like to correct many of you.
“ Motors have windings “

Now that we have over twenty pages of "set-up numbers" maybe it's time to look at why some numbers work better for some than others. Operating temperature is something that should be closely payed attention to. Von Der Hey

Yes, this is what works for me.

It's the height of the sleeve ports in relationship with the ports on the case that need to be properly aligned. If you raise the sleeve to .203 it doesn't do much good if you can't raise the exhaust manifold port in the case. Likewise with the intake and transfer ports. This sounds simple but there...

Hmmmm. I wonder if port alignment could affect the performance of the engine as much as the timing change does. Just maybe having the ports aligned as good as they can get along with the fit & seal location in its ultimate location could be a good formula for creating consistent and fast engines. Hi...

When I posted this information I was only trying to share the things that I fell that have helped increase the performance of the engine and airframe. Again this is only my opinion. I am a truck driver, not an engineer, scientist or genius. Good luck, Von Der Hey.

The theory on the front cross beam is a simple one. It gives much more glueing surface from the mount to the G10 board so that things don't vibrate loose after numerous flights. Also it does stiffen the front end even more when it's incoorporated into the front of the fuse. All of the hints that I h...

Here are a couple of photos of the mount I use. Also a solid test stand is a good idea to have. Never ever peak an engine on the test stand just to see what it will do. You will hurt it. Adding an additional 10% castor oil to the fuel really helps with the break-in process as well. All of this is no...

Aero Precision Machine makes the nut plate and an engine mount that I use which has five front hold down screws which mount to a G10 plate which in turn is all glued to the front of the fuse. Ask for the Von Der Hey mount. Von Der Hey.

This info is directed towards Kurt but would work for all. You can call up Mike @ APM and order the set-up that I use. .192 & .019 . Ask for no glue in the crank and the piston fit @ .280 to .290 Break it in just like Ray says and race it with a 7.4 X 7.5 After a few runs you should be leaving the g...

Well let me start with an apology for the sarcastic classification of all of you that are trying to figure out how to find that optimum set up for the Nelson Q-40 engine. I have to admit that the term "Scientist" would have been a little better. Never the less a degree wheel can give documentation o...