Airspeed and RPM vs Prop Pitch - Zenith Aircraft Builders and Flyers2024-03-28T21:42:29Zhttps://zenith.aero/forum/topics/airspeed-and-rpm-vs-prop-pitch?feed=yes&xn_auth=noStatic is 4800.tag:zenith.aero,2019-09-09:2606393:Comment:6913852019-09-09T17:47:24.888ZJim Davishttps://zenith.aero/profile/JimDavis449
Static is 4800.
Static is 4800. What was your static RPM?
tag:zenith.aero,2019-09-09:2606393:Comment:6914932019-09-09T15:18:14.793ZJonathan Fayhttps://zenith.aero/profile/JonathanFay
<p>What was your static RPM?</p>
<p></p>
<p>What was your static RPM?</p>
<p></p> The real reason is that the W…tag:zenith.aero,2019-09-09:2606393:Comment:6912002019-09-09T01:38:09.481ZJan Eggenfellnerhttps://zenith.aero/profile/JanEggenfellner
<p>The real reason is that the Whirlwind propeller does not set the pitch at the tip.</p>
<p>The real reason is that the Whirlwind propeller does not set the pitch at the tip.</p> My performance today. I feel…tag:zenith.aero,2019-07-17:2606393:Comment:6844832019-07-17T19:10:43.699ZJim Davishttps://zenith.aero/profile/JimDavis449
<p>My performance today. I feel good about this being my final prop pitch.</p>
<p></p>
<p>Zenith 650B</p>
<div><div class=""><div class="_1mf _1mj"><span> </span></div>
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<div class=""><div class="_1mf _1mj"><span>Viking 130 engine</span></div>
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<div class=""><div class="_1mf _1mj"><span>Whirlwind prop - pitch 25 degrees</span></div>
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<div class=""><div class="_1mf _1mj"><span>6500' MSL</span></div>
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<div class=""><div class="_1mf _1mj"><span>OAT =…</span></div>
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<p>My performance today. I feel good about this being my final prop pitch.</p>
<p></p>
<p>Zenith 650B</p>
<div><div class=""><div class="_1mf _1mj"><span> </span></div>
</div>
<div class=""><div class="_1mf _1mj"><span>Viking 130 engine</span></div>
</div>
<div class=""><div class="_1mf _1mj"><span>Whirlwind prop - pitch 25 degrees</span></div>
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<div class=""><div class="_1mf _1mj"><span>6500' MSL</span></div>
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<div class=""><div class="_1mf _1mj"><span>OAT = 66</span></div>
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<div class=""><div class="_1mf _1mj"><span>RPM:</span></div>
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<div class=""><div class="_1mf _1mj"><span>4800 = 100 KTAS</span></div>
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<div class=""><div class="_1mf _1mj"><span>5000 = 105 KTAS</span></div>
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<div class=""><div class="_1mf _1mj"><span>5200 = 112 KTAS</span></div>
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<div class=""><div class="_1mf _1mj"><span>5400 = Full Throttle = 120 KTAS</span></div>
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</div> Thanks Terry :-)
tag:zenith.aero,2019-07-15:2606393:Comment:6842602019-07-15T16:39:31.772ZJim Davishttps://zenith.aero/profile/JimDavis449
<p>Thanks Terry :-)</p>
<p></p>
<p></p>
<p>Thanks Terry :-)</p>
<p></p>
<p></p> Jim:
This last question is ea…tag:zenith.aero,2019-07-15:2606393:Comment:6842582019-07-15T16:27:01.548ZTerrence "Dr. Terry" Hallhttps://zenith.aero/profile/TerrenceHall
<p>Jim:</p>
<p>This last question is easy, 6-8 time fully tightened (I got this specifically from Nord-lock).</p>
<p>No experience with a 650, can’t Jan E be of any help?</p>
<p>Terry Hall</p>
<p>Jim:</p>
<p>This last question is easy, 6-8 time fully tightened (I got this specifically from Nord-lock).</p>
<p>No experience with a 650, can’t Jan E be of any help?</p>
<p>Terry Hall</p> I've been trying to find the…tag:zenith.aero,2019-07-15:2606393:Comment:6840442019-07-15T16:02:16.133ZJim Davishttps://zenith.aero/profile/JimDavis449
<p>I've been trying to find the sweet spot for my build too.</p>
<p></p>
<p>650B</p>
<p>Vikng 130</p>
<p>Whirlwind 68"</p>
<p></p>
<p>Initial - 23 degrees - leapt off ground and climbed great but hard to get over 115 MPH</p>
<p>2nd - 24 degrees - a little better but not much difference</p>
<p>3rd - 26 degrees - static/takeoff RPM = 4400 - wide open at cruise = 5100 RPM. 130 MPH. I kind of like this setting but takeoff performance is degrade a little and not sure if it puts too much stress on…</p>
<p>I've been trying to find the sweet spot for my build too.</p>
<p></p>
<p>650B</p>
<p>Vikng 130</p>
<p>Whirlwind 68"</p>
<p></p>
<p>Initial - 23 degrees - leapt off ground and climbed great but hard to get over 115 MPH</p>
<p>2nd - 24 degrees - a little better but not much difference</p>
<p>3rd - 26 degrees - static/takeoff RPM = 4400 - wide open at cruise = 5100 RPM. 130 MPH. I kind of like this setting but takeoff performance is degrade a little and not sure if it puts too much stress on engine.</p>
<p>4th - 25 degrees - static/takeoff RPM = 4800. Too bumpy to go wide open yesterday but definitely over 5300 rpm and about 122 MPH.</p>
<p></p>
<p>All at 2500' - 3500' MSL</p>
<p></p>
<p>Side question - how many times can you reuse the nord-lock washers before replacing?</p>
<p></p> Thanks for the explanation, I…tag:zenith.aero,2019-07-12:2606393:Comment:6837932019-07-12T22:14:44.834ZDavid Krakowskyhttps://zenith.aero/profile/DavidKrakowsky
<p>Thanks for the explanation, I have mine dialed in pretty well,</p>
<p>i was just surprised at the difference. Like you said the design of the prop </p>
<p>is the reason.</p>
<p>dave</p>
<p>Thanks for the explanation, I have mine dialed in pretty well,</p>
<p>i was just surprised at the difference. Like you said the design of the prop </p>
<p>is the reason.</p>
<p>dave</p> David:
The pitch will be diff…tag:zenith.aero,2019-07-12:2606393:Comment:6837902019-07-12T21:00:57.956ZTerrence "Dr. Terry" Hallhttps://zenith.aero/profile/TerrenceHall
<p>David:</p>
<p>The pitch will be different for different company propellers and whether you have a 750 STOL or a Cruzer.</p>
<p>The shape of the Warp drive is very different than the Whirlwind propeller.</p>
<p>The recommended pitch for 68 inch Whirlwind on Cruzer is approximately 21 degrees.</p>
<p>The recommended pitch for STOL is approximately 11-12 degrees (much lower).</p>
<p></p>
<p>Also the pitch can determine the max RPM.</p>
<p>If I set my pitch to 17 degrees, the max rpm is over…</p>
<p>David:</p>
<p>The pitch will be different for different company propellers and whether you have a 750 STOL or a Cruzer.</p>
<p>The shape of the Warp drive is very different than the Whirlwind propeller.</p>
<p>The recommended pitch for 68 inch Whirlwind on Cruzer is approximately 21 degrees.</p>
<p>The recommended pitch for STOL is approximately 11-12 degrees (much lower).</p>
<p></p>
<p>Also the pitch can determine the max RPM.</p>
<p>If I set my pitch to 17 degrees, the max rpm is over 6000 RPM (Cruzer with 68 inch Whirlwind).</p>
<p>If I set my pitch to 21 degrees, the max RPM is about 5200-5300 RPM.</p>
<p>Good luck. I can not impress the amount of anxiety on my first approach to propeller but in retrospect it was very easy,</p>
<p>Terry Hall</p>
<p></p>
<p></p>
<p></p> Just a curious question, I se…tag:zenith.aero,2019-07-12:2606393:Comment:6839652019-07-12T20:29:08.929ZDavid Krakowskyhttps://zenith.aero/profile/DavidKrakowsky
<p>Just a curious question, I see your degrees of prop pitch</p>
<p>are much higher than my three blade 68 inch warp drive.</p>
<p>can anyone explain the huge difference in prop pitch?</p>
<p>i am running 10-11 degrees while you are running almost twice that.</p>
<p>is it the design of the prop?</p>
<p>thanks</p>
<p>Dave</p>
<p>Just a curious question, I see your degrees of prop pitch</p>
<p>are much higher than my three blade 68 inch warp drive.</p>
<p>can anyone explain the huge difference in prop pitch?</p>
<p>i am running 10-11 degrees while you are running almost twice that.</p>
<p>is it the design of the prop?</p>
<p>thanks</p>
<p>Dave</p>