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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Sun Nov 07, 2010 8:06 am Post subject: 4 blades to 2 |
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I just couldn't put Zulu Delta away for the winter after the unsuccessful experiment with 4 blade Power Fin without trying it as a 2 blade. Just a little bit of work to remove 2 blades and reassemble, so why not. If nothing else it will keep me from having to drain so much fuel from the tanks when I do finally put her up on blocks. Anyway, it took three tries to crank enough pitch back into the prop for a total of over 3 degrees change from 4 blade to 2, and I was still a little off in that the engine can turn 6200 RPM at WOT. I prefer the low end of the RPM / peak HP curve with the engine turning 5900 to 6000 RPM, but interpolating from the performance I got from the last setting it would be a push to find the difference between the 3 blade WD and the PF with 2. Add the smoothness that the 3 blade provides and the nod goes to the WD.
There was quite the wind shear this morning even at 7:30 a.m. I got 18 to 20 mph ground speed going into the wind and 103 to 106 downwind. This at only 1000' when Weather Underground and the field wind sock were reporting wind at the surface at 14 to 16.
It all made for a fun approach. I held on to my altitude right to the runway threshold, pulled the throttle back to idle and kept the ASI at 50. I landed not quite half way down the runway. Kind of interesting holding the airplane in an almost level attitude while coming down on an approach angle of 45 degrees. I don't think I rolled 80 feet after touchdown before I had to add throttle to keep the plane moving forward.
Rick Girard
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
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slyck(at)frontiernet.net
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| Posted: Sun Nov 07, 2010 8:40 am Post subject: 4 blades to 2 |
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Rick, I went through a similar experiment: WD vs Powerfin. I ended up with parts for four props, 2 & 3 blade 70" WD,2 & 3 blade 65" PF. The first on the plane, even before it was legal, was the 3 blade WD. I soon found that was too much prop.
Next was the 3 blade PF which worked ok but seemed to lock you into a narrow speed band. Then I tried two blades on the PF
and that was insufficient prop for the engine. Last was two blade WD and I doubt more performance could be coaxed out of the suzuki than that setup.
As a plus I have backup equipment should I ding one and something to hang on the wall.
BB
parked for the winter.
BTW, my "rum rum" phenomenon seems to have gone away. Either hearing loss (quite possible as I have reverse slope loss in one ear
and normal geezer loss in the other) -or a new, different brand cog belt run at more tension.
On 7, Nov 2010, at 11:04 AM, Richard Girard wrote:
[quote]I just couldn't put Zulu Delta away for the winter after the unsuccessful experiment with 4 blade Power Fin without trying it as a 2 blade. Just a little bit of work to remove 2 blades and reassemble, so why not. If nothing else it will keep me from having to drain so much fuel from the tanks when I do finally put her up on blocks. Anyway, it took three tries to crank enough pitch back into the prop for a total of over 3 degrees change from 4 blade to 2, and I was still a little off in that the engine can turn 6200 RPM at WOT. I prefer the low end of the RPM / peak HP curve with the engine turning 5900 to 6000 RPM, but interpolating from the performance I got from the last setting it would be a push to find the difference between the 3 blade WD and the PF with 2. Add the smoothness that the 3 blade provides and the nod goes to the WD.
There was quite the wind shear this morning even at 7:30 a.m. I got 18 to 20 mph ground speed going into the wind and 103 to 106 downwind. This at only 1000' when Weather Underground and the field wind sock were reporting wind at the surface at 14 to 16.
It all made for a fun approach. I held on to my altitude right to the runway threshold, pulled the throttle back to idle and kept the ASI at 50. I landed not quite half way down the runway. Kind of interesting holding the airplane in an almost level attitude while coming down on an approach angle of 45 degrees. I don't think I rolled 80 feet after touchdown before I had to add throttle to keep the plane moving forward.
Rick Girard
--
Zulu Delta
Kolb Mk IIIC
582 Gray head
4.00 C gearbox
3 blade WD
Thanks, Homer GBYM
It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.
- G.K. Chesterton
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