Warp Drive Prop Service Bulletin for HP Hubs - Zenith Aircraft Builders and Flyers2024-03-29T12:20:33Zhttps://zenith.aero/forum/topics/warp-drive-prop-service-bulletin-for-hp-hubs?commentId=2606393%3AComment%3A649057&x=1&feed=yes&xn_auth=noHi Gil
you may not have to ad…tag:zenith.aero,2018-10-10:2606393:Comment:6490572018-10-10T17:55:50.030ZDavid Krakowskyhttps://zenith.aero/profile/DavidKrakowsky
<p>Hi Gil</p>
<p>you may not have to adjust the pitch at all.</p>
<p>Retorquing the mounting bolts does not loosen the blade </p>
<p>pitch setting. </p>
<p>if the plane performs well the pitch might be correct.</p>
<p>how can you tell? I’m not sure of the max rpm of your engine,</p>
<p>if its 2700 rpm, what rpm’s do you see at maximum power in cruise</p>
<p>properly leaned?</p>
<p>if you are at the max rpm for your engine in top cruise you are ok.</p>
<p>if you want higher top end at the…</p>
<p>Hi Gil</p>
<p>you may not have to adjust the pitch at all.</p>
<p>Retorquing the mounting bolts does not loosen the blade </p>
<p>pitch setting. </p>
<p>if the plane performs well the pitch might be correct.</p>
<p>how can you tell? I’m not sure of the max rpm of your engine,</p>
<p>if its 2700 rpm, what rpm’s do you see at maximum power in cruise</p>
<p>properly leaned?</p>
<p>if you are at the max rpm for your engine in top cruise you are ok.</p>
<p>if you want higher top end at the expense of climb you can increase the pitch very</p>
<p>slightly, I usually use 1/4 degree increments. So measure your pitch, if you are at 10.5 you can try</p>
<p>10.75. If you are looking for more climb, reduce the pitch 1/4 degree </p>
<p>test fly the plane and if you find your sweet spot, that’s it.</p>
<p>the higher your cruise speed the lower your climb rate and vice versa.</p>
<p>my Continental 0-200 likes between 10.25 and 10.75 degrees</p>
<p>since you have more power with a 0-235 your numbers may be different than mine, I would expect you could </p>
<p>dial in more pitch than mine.</p>
<p>but like I said if you are happy with your cruise and climb, it’s not necessary to adjust it at all.</p>
<p>I would suggest taking the hub off your plane and clean the surfaces of the hub and crank hub.</p>
<p>i found some corrosion which is not unusual when you have dissimilar metals in contact with each other.</p>
<p>i removed the corrosion and treated the surfaces with corrosion x</p>
<p>Dave</p> I heard back from Warp Drive…tag:zenith.aero,2018-10-10:2606393:Comment:6490542018-10-10T15:37:08.976ZGil DeVaulthttps://zenith.aero/profile/GilDeVault
<p>I heard back from Warp Drive and I have the older hub, so all I need to do is check my torque on the mounting bolts. I bought a protractor and they told me on the 0-235 I should be between 9 and 12 degrees for 2300 RPM. My static RPM is about 2400 rpm so I'm not sure if I should increase the pitch or any idea what to expect if I do. It is all uncharted territory for me.</p>
<p></p>
<p>Gil. </p>
<p>I heard back from Warp Drive and I have the older hub, so all I need to do is check my torque on the mounting bolts. I bought a protractor and they told me on the 0-235 I should be between 9 and 12 degrees for 2300 RPM. My static RPM is about 2400 rpm so I'm not sure if I should increase the pitch or any idea what to expect if I do. It is all uncharted territory for me.</p>
<p></p>
<p>Gil. </p> Hi Gil
I have had both a wood…tag:zenith.aero,2018-10-09:2606393:Comment:6487992018-10-09T14:27:11.408ZDavid Krakowskyhttps://zenith.aero/profile/DavidKrakowsky
<p>Hi Gil</p>
<p>I have had both a wood prop, Sensinich two blade 68x57</p>
<p>and the warp drive three blade 68 inch tapered blades.</p>
<p>Yes, technically the two blade is slightly more efficient, but you lose</p>
<p>the ability to fine tune the prop to your airframe and engine. You can </p>
<p>set the prop to a cruise prop or a climb prop and anywhere in between.</p>
<p>i can certainly tell you the three blade is a lot smoother. My oil filler access</p>
<p>door used to vibrate a lot with…</p>
<p>Hi Gil</p>
<p>I have had both a wood prop, Sensinich two blade 68x57</p>
<p>and the warp drive three blade 68 inch tapered blades.</p>
<p>Yes, technically the two blade is slightly more efficient, but you lose</p>
<p>the ability to fine tune the prop to your airframe and engine. You can </p>
<p>set the prop to a cruise prop or a climb prop and anywhere in between.</p>
<p>i can certainly tell you the three blade is a lot smoother. My oil filler access</p>
<p>door used to vibrate a lot with the two blade prop, which had been dynamically balanced.</p>
<p>with the three blade warp drive no vibrations at all and it has not</p>
<p>been dynamically balanced.</p>
<p>So that’s why I prefer the warp drive, my Sensinich is hanging on the wall as decoration.</p>
<p>Dave</p> I don't want to influence any…tag:zenith.aero,2018-10-09:2606393:Comment:6486302018-10-09T14:18:26.196ZJoe Spencerhttps://zenith.aero/profile/JoeSpencer
<p>I don't want to influence anybody and think everybody oughta do the 15 hour inspection.</p>
<p></p>
<p>The info I got was that 2 out of hundreds have cracked. The hub looks to me like it might be susceptible to overtorquing. My Craftsman torque wrench is technique sensitive and will go beyond the desired setting if not held just so and it's not always very noticeable. I wonder how many more are out there like that. And we all know that some of us can tear up an anvil so that may be a factor…</p>
<p>I don't want to influence anybody and think everybody oughta do the 15 hour inspection.</p>
<p></p>
<p>The info I got was that 2 out of hundreds have cracked. The hub looks to me like it might be susceptible to overtorquing. My Craftsman torque wrench is technique sensitive and will go beyond the desired setting if not held just so and it's not always very noticeable. I wonder how many more are out there like that. And we all know that some of us can tear up an anvil so that may be a factor in the 2 that failed. The answer I was looking for was that the failures aren't due to harmonics. If so that would have been a mandatory change to a different prop for me. I didn't know there was a mandatory torque check every 15 hours(did I really tell that?) and the only time I've ckd it was when I removed the prop for some reason. It's got 500 hours or so on it. All that seemed favorable to me when I was evaluating this SB. OTOH if you go online and search WD history there have been hub cracks and blade separations but all those have been corrected long ago. Search it for yourself, I was unaware and a little surprised. Maybe the engraving will actually cause another series of failures WD will know/correct in time.</p>
<p></p>
<p>WD has liability to think about; I understand.</p>
<p>I've been told.</p>
<p>Don't mind me, do the inspection.</p>
<p></p> I have everything on my shelf…tag:zenith.aero,2018-10-09:2606393:Comment:6486262018-10-09T13:13:40.837ZGil DeVaulthttps://zenith.aero/profile/GilDeVault
<p>I have everything on my shelf to install an Ed Serba 68/57 wood prop and Saber extension and bolts. Your right about cost, everything came out to a little over $1,200.00 dollars. Problem is, parts are for a Lycoming 0-235 C1B & my flying 601 has an L2C 0-235. They have different mounting hubs. First I will check and see if I can just change the hub on the engine. I'm told the two blade prop offers better performance, but that I don't know. </p>
<p>I have everything on my shelf to install an Ed Serba 68/57 wood prop and Saber extension and bolts. Your right about cost, everything came out to a little over $1,200.00 dollars. Problem is, parts are for a Lycoming 0-235 C1B & my flying 601 has an L2C 0-235. They have different mounting hubs. First I will check and see if I can just change the hub on the engine. I'm told the two blade prop offers better performance, but that I don't know. </p> Dave
Well said. Notice in my…tag:zenith.aero,2018-10-09:2606393:Comment:6487142018-10-09T03:50:47.989ZDel Cloweshttps://zenith.aero/profile/DelClowes
<p>Dave</p>
<p>Well said. Notice in my reply to Joe I diden't claim that my prop is torqued @ 10-15 hrs. only that WarpDrive instructed to do so. Mine has been flying for four years and is great. </p>
<p>You are spot on "fly the crap out of it".</p>
<p>Del </p>
<p>Dave</p>
<p>Well said. Notice in my reply to Joe I diden't claim that my prop is torqued @ 10-15 hrs. only that WarpDrive instructed to do so. Mine has been flying for four years and is great. </p>
<p>You are spot on "fly the crap out of it".</p>
<p>Del </p> Hi Gil
I think if you took a…tag:zenith.aero,2018-10-09:2606393:Comment:6487802018-10-09T02:58:10.478ZDavid Krakowskyhttps://zenith.aero/profile/DavidKrakowsky
<p>Hi Gil</p>
<p>I think if you took a survey you would find that no one who has a warp drive prop the torques their </p>
<p>props every 15 hours. I do mine at the annual condition inspection.</p>
<p>The manufacturer makes those recommendations to Cover their asses.</p>
<p>props are expensive and once you price a few I think you might change your mind.</p>
<p>Sensinich provides the original wood prop on my AMD built 601XLB, runs about $1,000 plus the spinner and hardware. Figure about…</p>
<p>Hi Gil</p>
<p>I think if you took a survey you would find that no one who has a warp drive prop the torques their </p>
<p>props every 15 hours. I do mine at the annual condition inspection.</p>
<p>The manufacturer makes those recommendations to Cover their asses.</p>
<p>props are expensive and once you price a few I think you might change your mind.</p>
<p>Sensinich provides the original wood prop on my AMD built 601XLB, runs about $1,000 plus the spinner and hardware. Figure about $1500. </p>
<p>The composite Sensinich runs about $3000.</p>
<p>i really wouldn’t worry about it if you have the non service bulletin hub like</p>
<p>i do. </p>
<p>Just fly the crap out of it.</p>
<p>Dave</p>
<p></p> I understand the 15 hour bolt…tag:zenith.aero,2018-10-09:2606393:Comment:6485432018-10-09T02:45:31.927ZGil DeVaulthttps://zenith.aero/profile/GilDeVault
<p>I understand the 15 hour bolt torque check is called for regardless of the Warp Drive prop hub you have. My spinner is held on with a lot of screws, and the prop bolts are all safety wired. I am not disputing the fact this should be done every 15 hours, I just don't care for it and I will look for a different option for my 601. Maybe there isn't a better option, but I will check and see what all my options are. </p>
<p>I understand the 15 hour bolt torque check is called for regardless of the Warp Drive prop hub you have. My spinner is held on with a lot of screws, and the prop bolts are all safety wired. I am not disputing the fact this should be done every 15 hours, I just don't care for it and I will look for a different option for my 601. Maybe there isn't a better option, but I will check and see what all my options are. </p> Joe; …tag:zenith.aero,2018-10-09:2606393:Comment:6487762018-10-09T00:40:28.478ZDel Cloweshttps://zenith.aero/profile/DelClowes
<p>Joe; I also talked with Darryl and have the same understanding as you. My hub is an early model (no engraving) that has had no problems. The instructions from WarpDrive do however stipulate retorque every 10-15 hrs. Kind of a good time to check the hub condition. </p>
<p>Del Clowes</p>
<p>Joe; I also talked with Darryl and have the same understanding as you. My hub is an early model (no engraving) that has had no problems. The instructions from WarpDrive do however stipulate retorque every 10-15 hrs. Kind of a good time to check the hub condition. </p>
<p>Del Clowes</p> Hi guys
There's some confusio…tag:zenith.aero,2018-10-08:2606393:Comment:6486812018-10-08T15:15:51.653ZJoe Spencerhttps://zenith.aero/profile/JoeSpencer
<p>Hi guys</p>
<p>There's some confusion with this SB. I read it a couple times and didn't see that the SB says the replacement hub eliminates the 15 hour inspection. The inference is definitely there but nowhere do I see it stated(did I miss it?). I also don't see any statement that Item 5 under "if no crack is found" on p3 doesn't apply if the new hub is purchased. I do see an offer for a new hub for 150 but no statement in that offer that relates it to the 15 hour required inspection being…</p>
<p>Hi guys</p>
<p>There's some confusion with this SB. I read it a couple times and didn't see that the SB says the replacement hub eliminates the 15 hour inspection. The inference is definitely there but nowhere do I see it stated(did I miss it?). I also don't see any statement that Item 5 under "if no crack is found" on p3 doesn't apply if the new hub is purchased. I do see an offer for a new hub for 150 but no statement in that offer that relates it to the 15 hour required inspection being eliminated.</p>
<p>So I called Darryl again and asked and what I understand is that the 15 hour inspection requirement stands(even with the new hub) until further notice from Warp Drive. I also understand that the 2 cracked hubs are not related to a harmonic balance problem in the engine(s)/prop combination that we have.</p>
<p>Don't take my word for it confirm it to suit yourselves but I see some of you look to be thinking you're out from under the inspection if you spend the 150. That's not how I understand it.</p>
<p>Joe Spencer</p>
<p></p>