Webra 160; was: Mintor 1.70

[Jerry Budd]

That's pretty good, the best numbers I've heard yet for a 3M-170.

For comparison my Webra 160 turned the APC 17x12 at 8500 rpm at the 
Fresno Contest in June and then again in 104 degree heat at Riverside 
on the 4th of July.  That's not peak rpm but the flight setting which 
was a bit rich (new motor and all).  Magnum #1, YS plug, ES-2C140L90 
pipe set at 23-1/4" baffle to plug, stock 1.75" rise Mac's header, MC 
carb.  The motor is timed so that it doesn't come onto the pipe at 
all (i.e., NO pipe jump), and the throttle response is linear from 
idle to full power.  It's also ultra quiet on the ground (under 92 db 
at the Nats) and in the air.

Tony Frackowiak's running the same setup in an Alliance on Magnum 15% 
fuel and turning 8200-8400 (again set a bit rich).

I can't imagine what else anyone would want out of a motor.  It's 
essentially perfect.

Jerry


>My 1.70 hit 8200 rpm with 10% magnum, APC 17X12 regular, at the 
>Lubbock contest. It was hot and high, reports were that it was like 
>being at 7200 ft.
>
>
>
>Gray Fowler
>Principal Chemical Engineer
>Composites Engineering
>
><rcaerobob at cox.net>
>Sent by: discussion-request at nsrca.org
>
>08/11/2003 10:49 AM
>Please respond to discussion
>        
>         To:        discussion at nsrca.org
>         cc:        
>         Subject:        Re: Mintor 1.70
>
>
>
>HO-LY-COW !  That's a pretty beefy setup, for sure.  10% Nitro? 
> You're kiddin', right??
>
>Bob P.
>>
>>  From: "Wayne Galligan" <wgalligan at goodsonacura.com>
>>  Date: 2003/08/11 Mon AM 11:27:50 EDT
>>  To: <discussion at nsrca.org>
>>  Subject: Mintor 1.70
>>
>>  Just a few notes on my initial test and break-in on this engine. 
>> It has not been installed in my plane as of this writing but I 
>>cant wait.
>>
>>  3M 1.70 stock header
>>  10 % Magnum fuel
>>  Bluebird c.f. 2-stroke pipe  24.25" center of head to 1st baffle. 
>> Total length of exhaust center of head to end of pipe  31.5"
>>
>>  Test day 98 degrees and about 35%+ humidity
>>
>>  17x12N APC      high 8500rpm low 1600rpm
>>  17x13 std APC   high 8250rpm  low 1500rpm
>>
>>  This is after 5) 16oz tanks of breakin.  I broke it in just like 
>>the OS,  alternating rich to lean during first several tanks.
>>
>>  Wayne Galligan
>>
>>
>
>Bob Pastorello, El Reno, OK, USA
>rcaerobob at cox.net
>www.rcaerobats.net
>Just a few notes on my initial test and break-in on this engine.  It 
>has not been installed in my plane as of this writing but I cant 
>wait.
>
>3M 1.70 stock header
>10 % Magnum fuel
>Bluebird c.f. 2-stroke pipe  24.25" center of head to 1st baffle. 
> Total length of exhaust center of head to end of pipe  31.5"
>
>Test day 98 degrees and about 35%+ humidity
>
>17x12N APC      high 8500rpm low 1600rpm
>17x13 std APC   high 8250rpm  low 1500rpm
>
>This is after 5) 16oz tanks of breakin.  I broke it in just like the 
>OS,  alternating rich to lean during first several tanks.
>
>Wayne Galligan


-- 
___________
Jerry Budd
mailto:jbudd at qnet.com
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