Regluing the Super Mac

Kevin_Richey

Yamaha gyro...Oregon, USA
Joined
Nov 16, 2003
Messages
2,292
Location
Oregon, USA
Aircraft
Sport Copter gyroplane
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300+ gyroplane, 11 airplane, 1.5 PPC, AND... a ZILLION hours of flying in my dreams!
Dave: Glue holds the...intake manifold onto the case?
Is that to ensure no intake leaks (too lean)?
Hadn't heard MACs are glued" together!
 

Chris Burgess

GYRO-CFI
Joined
Oct 30, 2004
Messages
788
Location
Winter Garden FL 34787
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Many makes and models, prefer open frame, Sold my SnoBird Tandem
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3400+
Bill Parsons told me it was Devcon? Anyway a short story. The Super MAC crankcase cracked on our first Parson's in flight. The case split at a thin spot in the "shaving" and cracked one ear off a cylinder as well. The case was shaved just a little too much I guess. I was running the "poor thing" at full throttle back in those days (1987) with students over 200#, just a little over. A chunk of the Devcon below the carb reed-valves broke away from the case and went through the prop. Remarkable this happened in the pattern on downwind. The super MAC continued to run that way enough to get us safely on the ground. I couldn't believe it was still running like that. Just one of the many MAC's I pretty much destroyed. Bill had built up this first Super MAC.
 

dabkb2

Dave Bacon
Joined
Sep 26, 2005
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2,197
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Vista, Ca
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2 KB2 90Mac KB3 582
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289 hours
Dave: Glue holds the...intake manifold onto the case?
Is that to ensure no intake leaks (too lean)?
Hadn't heard MACs are glued" together!
How are things your way? On the super Mac the reed cage is bolted to the case. The glue is there to stop intake leaks. Yamabond works good.
 
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