RCU Forums - View Single Post - 1/2A THRUST-O-METER
View Single Post
Old 02-26-2004, 03:24 PM
  #19  
combatpigg
Senior Member
My Feedback: (3)
 
combatpigg's Avatar
 
Join Date: Nov 2003
Location: arlington, WA
Posts: 19,891
Likes: 0
Received 0 Likes on 0 Posts
Default RE: 1/2A THRUST-O-METER

WELCOME TO TODAYS' DYNO REPORT! The engine tested was the WASP .061, on 30%, compression adjusted for best rpm and needle. Ran with a stock head, and through the muffler.

PROP RPM THRUST OZS COMMENTS

5-3 COX 20000 16.2 can't go wrong, plus it's variable pitch

4.75-4 COX 20800 14.4 oink

6-3 MAS 16300 16.8 mistaken for COX in previous tests

6-4 COX 16500 16.2 outdone by MASTER AIRSCREW

5.7-3 19200 16.8 hard to beat

5.5-2 22500 16.8 better for 3D, and throttle response

7-2 WOOD 15000 12.0 good for low idle, airbrake effect

The mysterious confusion about the earlier test results was my fault. Yesterday it looked like the COX 6-3, and 6-4 props were giving identical results. The fact is I don't have a COX 6-3, it's a MASTER AIRSCREW instead[:@]. Bear with me, we'll get the story straight. I started to do a .061 diesel comparison with an old AME last night, but the THRUSTOMETER claimed its' first victim. The rod snapped in half cleanly in the middle! It was going to be a honkin' run too! Stay tuned, I'll slap a diesel head on the WASP next and get some #s.