3M Mintor 170 questions

[Dean Pappas]

Hi Jim,
Wide Open Throttle.
Most workable 2-cycle setups, 'till now have needed pipes long enough to cure mid-range ills, that a 10 degree WOT dive causes richening, and even quitting!
It's a Control-Line piped Stunt setup.
Dean

-----Original Message-----
From: Woodward James R Civ 412 TW/DRP/ACQ [mailto:James.Woodward2 at edwards.af.mil]
Sent: Monday, May 05, 2003 3:44 PM
To: discussion at nsrca.org
Subject: RE: 3M Mintor 170 questions



Hi Dean,

 

I'm still sort of new.  Does W.O.T. = with out throttle?  On 45 degree downlines of medium length like the reverse Cuban eight from the top (Masters sequence), I'd say the motor just unloads some.  If it were lean, it might cut-out for a second when throttling up.  If it were rich, it might gurgle or give signs of loading up.  The 140 or 170 do neither.  They just increase in rpm as the throttle is increased.  

 

On the 140 setup (15% C.P., 2 OSA5), I needed to lean the low-end screw 1/8 turn during the 2nd tank on the ground.  This setting has held fine since, now with 1.5 gallons through it.  The engines will idle very low, however, I raise it to 2000 for takeoff and flight.  

 

Your technique is the first I've heard of like this.  So, once you get this one flight profile right, you find a prop that gets the torque you want?

 

Jim

 

 

Thanks for the response Jim,

That sounds right, though I just like more prop and more quiet.

When you dive W.O.T at about 15 degrees or so ( simulating using windup for extremely windy conditions) does the engine lean/richen/or just unload ? With the 17-13 on the 140, I shortened 'till the richening was gone. That was just under 1" gap from stock.

Dean

 

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