Trombone the Moki
06-28-2008, 03:35 PM
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Trombone the Moki
Guess what I’m going to do?
No, it doesn’t involve the nosey cat.
Moki/Mark 2.10, APC 16X16 Macs double quiet tuned pipe.
06-28-2008, 10:36 PM
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RE: Trombone the Moki
Well you all could be right, except is doesn’t do well on Dr. Pepper.
I was thinking of putting it on a Lanier Dominator 1500 http://www.lanierrc.com/airplanes/lana0241.html
or scratch build a giant Diamond Dust, but now I'm not so sure. For sure it wont be the Sundowner, been there done that.
The results were a bit disappointing, it only turned 8400 and I was hoping for 9000+.
Temperature was 88*F and I tried FAI, 5% and 10% with no difference between fuels worth noting.
There were unusual things of interest.
#1 On most model engines there is very little speed difference between wide open throttle and 95% open. This engine is very speed sensitive in regards to high throttle position, this leads me to think that the venturi is small and therefore the first limiting factor.
#2 The high speed needle is the most sensitive I have ever come across.
#3 The engine can Idle at 1700 RPM for 5 minutes or more and the throttle is stabbed it just jumps to full power with no hint of loading up.
#4 It refused to start with the back flip method. My arm was getting tired so I used my electric starter.
#5 The tuned pipe was best at almost full header length. (as pictured above)
I reinstalled the Slimline inverted pitts # 21265 and it yielded 7500 RPM
Past tests:
Bissom (Racer) Sundowner pitts 7800 RPM.
Short open header(engine invert and header pointed down) 8400 RPM.
All with the APC 16X16
I was thinking of putting it on a Lanier Dominator 1500 http://www.lanierrc.com/airplanes/lana0241.html
or scratch build a giant Diamond Dust, but now I'm not so sure. For sure it wont be the Sundowner, been there done that.
The results were a bit disappointing, it only turned 8400 and I was hoping for 9000+.
Temperature was 88*F and I tried FAI, 5% and 10% with no difference between fuels worth noting.
There were unusual things of interest.
#1 On most model engines there is very little speed difference between wide open throttle and 95% open. This engine is very speed sensitive in regards to high throttle position, this leads me to think that the venturi is small and therefore the first limiting factor.
#2 The high speed needle is the most sensitive I have ever come across.
#3 The engine can Idle at 1700 RPM for 5 minutes or more and the throttle is stabbed it just jumps to full power with no hint of loading up.
#4 It refused to start with the back flip method. My arm was getting tired so I used my electric starter.
#5 The tuned pipe was best at almost full header length. (as pictured above)
I reinstalled the Slimline inverted pitts # 21265 and it yielded 7500 RPM
Past tests:
Bissom (Racer) Sundowner pitts 7800 RPM.
Short open header(engine invert and header pointed down) 8400 RPM.
All with the APC 16X16
