Hi Paul and everybody
Merry Christmas

I finally dusted of the old VCR tapes and downloaded them onto my computer to make DVD's
and have up loaded some parts to YouTube
First Starts and First Flights ect.
http://www.youtube.com/watch?v=I4Zm7zRU3vs
http://www.youtube.com/watch?v=loEZcospzi8&feature=related
http://www.youtube.com/watch?v=YpXFRisteek&feature=channel
http://www.youtube.com/watch?v=cbxxTLtJZGM&feature=channel


Mark Kirkpatrick

MSK6 20B

Great work Mark. OK everybody give him five stars.
I am curious. How fast was the 13B? How fast was the 20B?
Any cooling problems? The muffler seems to be working well.

Paul Lamar

I never got the speed or ROC out of the plane with the 13B I had hoped for, but I also never got around to cleaning up the airframe, nose wheel pant and intersection fairings or a paint job. I'm also not sure just how efficient the Ivo prop is becauseof the way the blade is twisted. With the 13B the cruise was 160 mph. I haven't gotten agood comparison with the 20B. The first time I fire walled it was 5 hours into the test flight period and that was when the re-drive broke, but the airspeed was flying passed the 160 mph mark. That was three years ago about the same time the shop I worked at for 28 years shut down. A lack of funds has slowed progress on getting the plane back in the air.I was quite happy with the cooling on the 20B. All the test flying was done is Augustwith and air temp of 100 deg. plus, the worst I saw on the oil temp was 210 in a long climb and water temps around the same. In cruse they would run 180's. The plane is still uncomfortably loud. You have to fly with noise canceling headsets. The exhaust system consists of 3 1-3/4 headers tube 21 long into a collector and then a 2 ¼  tube running to a Flowmaster muffler mounted under the co-pilots feet. I was thinking of trying a fishmouth exit on the back of the muffler to see if that helped.


Mark Kirkpatrick

MSK6 20B
    

The 13B dynamic chamber was overrated for aircraft use. I tried to tell them but they did not understand it :)

What broke on the Ross PSRU?

The fish mouth will help but beef it up. Keep a close eye on the inside of the muffler with a Harbor Freight bore scope as something could melt in there and plug up the exit.
It has happened. Best to use mufflers with nothing inside them. One of the tricks is to
use a fairly large can with a air blast tube down the center to keep it cool.
       
Paul Lamar