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n981ms(at)yahoo.com
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 Posted: Fri Apr 06, 2007 3:44 am Post subject: IO240 prop |
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Jeff,
Did you ever settle on a new prop. Last time we discused it I think you were still whittling away the Skystar prop. If you decided on one, I would be interested in what you think of its performance. With the hot weather on its way I may be in the market for more of a climb prop. (I am still running the Skystar prop.) Anybody else with IO240 prop data is welcome to chime in.
Maxwell
Maxwell Duke
S6/IO240/Phase II Flight Testing
The fish are biting.
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n85ae
Joined: 14 Mar 2007
Posts: 403
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| Posted: Fri Apr 06, 2007 7:21 am Post subject: Re: IO240 prop |
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I'm using a 74" x 56 Sensenich. I'm pretty happy with it. The next best combo was the original Skystar which I chopped 3/4" off the tips. If
I built another I would use this same 74", then trim the tips to get the
rpm to the happy point.
I'm pretty well convince that there is no magic bullet, best advice to
any IO-240 owner is look for 2300-2350 rpm static at full power. Lower
and you aren't getting full power, as the engine likes to rev.
I am also pretty sure that having the airfilter right on the throttle
body is a big mistake, and that if you look into induction tuning that
the air filter right on the throttle body gives you a super high (i.e.
unreachable induction resonance). So to get max power, at 2300
probably adding about 18" of tubing beween the filter and the throttle
body would probably show some improvement. I ran a bunch of
calculations in MS Excell a couple years ago, and was pretty well
convinced there's power to be found by doing this. Just have not had
time to play with it yet.
Skeptical? Come visit, and I'll let you ride my motorcycle with and without
the induction system connected. You would be amazed how much torque
is lost by just disconnecting a few inches of tubing from the throttle bodies.
It is a LOT. Torque is key to turning a prop for takeoff, so worth trying
I think.
Regards,
Jeff Hays
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n981ms(at)yahoo.com
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n981ms(at)yahoo.com
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| Posted: Fri Apr 06, 2007 2:13 pm Post subject: IO240 prop |
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Thanks for the info. Do you have any climb vs cruise data with the 74x56?
Maxwell
n85ae <n85ae(at)yahoo.com> wrote:
[quote]--> Kitfox-List message posted by: "n85ae"
I'm using a 74" x 56 Sensenich. I'm pretty happy with it. The next best combo was the original Skystar which I chopped 3/4" off the tips. If
I built another I would use this same 74", then trim the tips to get the
rpm to the happy point.
I'm pretty well convince that there is no magic bullet, best advice to
any IO-240 owner is look for 2300-2350 rpm static at full power. Lower
and you aren't getting full power, as the engine likes to rev.
I am also pretty sure that having the airfilter right on the throttle
body is a big mistake, and that if you look into induction tuning that
the air filter right on the throttle body gives you a super high (i.e.
unreachable induction resonance). So to get max power, at 2300
probably adding about 18" of tubing beween the filter and the throttle
body would probably show some improvement. I ran a bunch of
calculations in MS Excell a couple years ago, and was pretty well
convinced there's power to be found by doing this. Just have not had
time to play with it yet.
Skeptical? Come visit, and I'll let you ride my motorcycle with and without
the induction system connected. You would be amazed how much torque
is lost by just disconnecting a few inches of tubing from the throttle bodies.
It is a LOT. Torque is key to turning a prop for takeoff, so worth trying
I think.
Regards,
Jeff Hays
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n85ae
Joined: 14 Mar 2007
Posts: 403
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| Posted: Mon Apr 09, 2007 7:18 am Post subject: Re: IO240 prop |
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Cruise is about the same with all the props I have tried. I think that the
drag increases so much at speeds greater than 120, that basically the
prop becomes irrelevant.
Solo, in cold weather I probably get around 150 ft. takeoff (give or take).
Rate of climb in winter weather is generally around 14-1500 fpm, on the
very rare occasion I can get close to 2000 fpm. When the weather is
warmer I normally see around 11-1200 fpm. Hot weather, and heavy
climb sucks as much with any of the props.
If you're running the Skystar prop W74EK-2-58 I think chopping 3/4" off
each tip will get the best bang for the buck. I think my 74" performs a tad
better, but not worth the $1K unless, you just like spending money. The
3/4" trim on the W74EK-2-58 does a lot for performance, and I know at
least one other who's running that and would concur.
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but my Rocket should be flying by the end of summer. The prop on 24ZM was a very good performer (I think it still has the same one) and was made by Clark Lydeck at Performance Propeller.
