We did some pipe testing this week at ES composites shop. pictures added.

What were your results?

Sorry - that information is proprietary. <G>


Ed Cregger

I think it's fair to say that the results were:- less noise, similar smoke and a few more revs

great show, but where are the test results??????????????????????????????????????????? ???????????????
Proprietary, hogwash! then better be silent.

Looks good, Jeff. Did you beat 7560 on the Mej 22x8 (numbers from last time)?

That would be a very low 5.23 hp. Surely a DA50 can do better that that on a tuned pipe.

Main testing was on the DA 150 on greeves pipes.

mej. 32x10 open header 5600 rpm

9" to 11" header 5800 to 5900 rpm best transition 10.5" header at 5800 rpm...

mej. 28.5x12 three blade same same same....

DA 50 on ES pipe.... mej 23x10 10,000 rpm or something like that (just joking) 6800 i believe.... and deadly silent.

more importantly look at that beautiful test stand!!!!!

Nice stands.

I have a set of the ES carbon pipes for a 3w-106, similar to the black ones in the pictures. It would be nice if the pipes were short enough to exit before reaching the tailwheel of a 35%-40% plane. Perhaps a bit of an exaggeration but nobody makes a plane with a tunnel long enough for your pipes. By the time you add the header you have well over 4 feet of pipe!! I'm thinking of putting them on a full sized Baja Bug for stingers.

Thanks,
Here are the power curves of the two props you tested. I get almost 13 hp
The two are indeed almost the same. The 32"prop (engine 2) might be a tad lower revving.
Dick did a nice job, Chapeaux

Pat, shorter pipes won't cut it. In that case you need to use canisters, and live with the less available power. BTW , Pipes also increase fuel economy by stopping waste of fuel mixture blow-by.

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It was a joke, Pe. You know, funny, ha-ha...? <G>


Ed Cregger

Pe,

I understand what they do but the issue, if you want to call it that, is having a set of pipes that are inside the plane. If, and it's a real big if, I was ever to attend an IMAC meet as a competitor there would be a big hit on the scale appearence due to a pair of pipes running almost the full length of the plane under the fuselage. Now to build a plane from the ground up o accomodate the pipes would be another story but a large part of the internal structure would be lost to the pipes, and isolating the heat.

There has to be another way that maintains airframe cosmetics. These things are like hanging a pair of giant Peterbuilt intake cans on the side of a Mercedes.

How about a 2 stage NOZ?

Oops

Pe, remember this is about 1400 meters elevation, so it is closer to 4.8hp or so. Still, 30+ lb of thrust @ 56 knots and SILENCE is an excellent figure, and transition is far more important than peak power.

Jeff, your engine stands look great! What plane will get that DA-150? I really miss flying with you, Brian Copfer, and Dave Fox, and especially my pal Dick H. (I am Dr. Terry's son, now live 2500 miles away).

Pat, those pipes will surely be buried in the fuse. Jeff (Blaylock) is a highly-skilled IMAC competitor in the Unlimited class, and is a Contest Director, and wouldn't risk losing a contest by blowing the scale points. Also, judging by his signature line, Dick Hanson will have something to do with it. Building the pipes into the fuse just takes a bit of planning and thinking "outside the box". and some skill as a fabricator. Of course these are now in short supply! Also, get enough air flow past the pipes and throught the fuse and we shouldn't have any heat issues. Of course flying in some god-forsaken desert would necessitate other cooling methodology.

Pat,
They sure know how to integrate the pipes in the looks of motorbikes. If they could make them smaller, they would, but the physics won't be fooled.

@ Bterry,
Altitude will not change rpm for a certain prop, because the lower load will be compensated by the lower available oxygen for the combustion, power will be even lower though like you already stated.
4.52 horses, and 30.5 lbs thrust is what I calculate from your data at your altitude.