MZ 34 Initial Run Up

Well I finally started the engine!!!!!!!!  My theory of engine mounting was correct!!! The vibration was absolutely minimal. This is so much less than a 277 Rotax!!  Once the engine is running above 1400 rpm, which is only 598 prop rpm, the engine smoothed right out. I am spending the rest of the week end breaking in the engine. Next week end could be the first taxi test. I am uploading a video The theory was explained in this blog post   http://www.blogger.com/blogger.g?blogID=25566109025005725#editor/target=post;postID=7281790481309410657

My Friend Yuki has a 277 mounted in a FP303, and the vibration is so bad, his instruments are failing. This thing is really running smooth. so later in the day I added the cowl. I was getting worried that the engine would not cool properly because of the cowl baffling. So my Buddy Ed and I installed the cowl and spinner and ran her up. The engine definitely cooled better, but the cowl is seeing high temps after shut down. Some of the paint near the exhaust pipe started to blister. I need to add header wrap to the pipe, and aluminum foil insulation to the inner surface of the cowl, and a heat shield between the exhaust and the fabric. Sounds like tomorrows job.



I added the foil and header wrap. Should be smooth sailing this week end. i plan on running the engine in for 5 hours before I attempt to fly. I bet my neighbors will be thrilled!!!

insulation

I used 3m automotive trim adhesive to bond the insulation. Aircraft Spruce sell this product.

header wrap installed

this should take care of the need for a thermal barrier against the fabric. There is a lot of air flowing there and during the run up there weren't any issues.

and finally here is a video of the second run up with the cowl in place. I'm pretty proud how well centered the spinner is