Posts: 11505
Joined: 2/25/2002 From: Central, CA, USA Status: offline
I think I got your intent on the last.
Where longevity is concerned I'd have to give the nod to the 3mm engine. The extra mass always converts to better heat management, and provides more support in the places where it's needed. The DL is lighter and perhaps a shade more rpm but I can't see any large benefits of the DL over the 3mm.
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If you can''''t fix it with a hammer, you have an electrical problem.
Posts: 3028
Joined: 5/22/2005 From: Bear,
DE, USA Status: offline
Pat the 22A is the wrong prop for that engine... you would have been a lot further ahead with the 23A or 23B. They are def. loud though.
on my WH 260 the difference between a PT, Xoar, and Vess 26A was night and day. Each had a substantial increase is raw thrust with the PT being the lowest and the difference between the Xoar and Vess double difference of the PT / Xoar. It was like putting a turbo on my 85.
Personally I went back to Mejzlik for noise reasons.. but if I was out for all out 3D I would put back a Vess any day though.
I have seen simialr results on my 60 but haven't tried a 23B.. I hear that is the prop for it.. but back comes that noise issue again.
Posts: 11505
Joined: 2/25/2002 From: Central, CA, USA Status: offline
MSC props are too loud for IMAC in most locations. Tremendous pull and slow speed performance for 3D, but not an IMAC prop.
Jake,
The poerformance of the Vess 22A was so pitiful that I doubt that I'll be inclined to try another. Back to their sizing. You don't have any usable size reference to baseline against other manufacturers. Just about every manufacturer make a 22-8 or 10 that is a good starting point with 50cc class engines. Had Vess elected to tell everyone that their props required that they be an inch larger than everyone elses to make similar performance it would save a lot of time and money in experimentation. Now you have the "A" and "B" nomenclature. Just what the hell does that refer to and how does it relate to anything?
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If you can''''t fix it with a hammer, you have an electrical problem.
Posts: 3028
Joined: 5/22/2005 From: Bear,
DE, USA Status: offline
Pat I hear ya on the naming convention.. doesnt quite make sense to me.
The issue is that the tips are so flat so the numbers are high. I just know with the T-52 being so powerful it will def like the 23 better. Honestly I think it would be worth your while to give it another shot for a 3D bird. I couldnt believe the difference until I played with it myself.
That being said the noise is an issue for most people.
My buddy went from ripping a Xoar 22x8 at full throttle to a 23B that pulled decent and wouldn't rip but what just plain loud all the time. When I fly his plane I usually take off at full snap to KE and then get off the throttle the rest of the time because it's too annoying
Posts: 11505
Joined: 2/25/2002 From: Central, CA, USA Status: offline
Noise is a perception thing. I don't find the MSC props that loud, but then again I usually have a fairly good muffler and little to no fuselage resonance. Because of the increased blade width an MSC swings at a lower rpm with more thrust than a narrower blade prop. Much worse is a cut down Zinger. There are times that I view IMAC regulations to be similar to a liberals political outlook . Everybody else has to toe the line since they already developed a rule that suited and fit where they were already at.
Fortunately I don't fly anyplace that has noise nazis running around with a db meter or that has neighbors close in. Aside from that I have a problem with some of those preaching the loudest about noise. Once they leave the flying field they turn on a 400 watt car stereo at 80% volume with a mega bass amplifier, while using loud exhaust systems on their vehicles. Some driving pick ups and sport utilities do the same thing but have aggressive tread tires on the vehicles that howl to high heaven. Then they use leaf blowers at home to clean up the yard. Same goes with many living close to a flying field....
< Message edited by Pat Roy -- 5/26/2008 5:06:07 PM >
_____________________________
If you can''''t fix it with a hammer, you have an electrical problem.
Finally got my plane in the air yesterday.......only 2 flights, my nerves wouldn't handle more - first big gasser....Tom the engine worked a dream, just a bit burbly in the low mid range. since it's only the third run on the engine, and first 2 in the air, I'm not too concerned. I'll adjust the idle about 1 screwdriver blade thickness leaner.
General opinion at the field is the plane is pleasantly quiet - I couldn't hear..my heart was pounding in my ears LOL
Didn't remember to tach the engine. Top end was plenty for straight up Stall turns as high as I wanted to go...landing was slow, tail down 3 pointers both times
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RE: New 53cc engine now ava... - 
