I need a prop and some suggestions! - Zenith Aircraft Builders and Flyers2024-03-29T02:05:10Zhttps://zenith.aero/forum/topics/i-need-a-prop-and-some-suggestions?commentId=2606393%3AComment%3A695282&feed=yes&xn_auth=noHi Geo,
The prop arrived yest…tag:zenith.aero,2019-10-11:2606393:Comment:6954792019-10-11T13:21:41.039ZJohn McGlynnhttps://zenith.aero/profile/JohnMcGlynn345
Hi Geo,<br />
The prop arrived yesterday after 3 months. I think I ordered it around August 8. I called Aircraft Spruce yesterday for an update and they promised a call back. Normally I give Aircraft Spruce a 5 on orders but this one was a 3 at best. I’ll keep you posted.
Hi Geo,<br />
The prop arrived yesterday after 3 months. I think I ordered it around August 8. I called Aircraft Spruce yesterday for an update and they promised a call back. Normally I give Aircraft Spruce a 5 on orders but this one was a 3 at best. I’ll keep you posted. John,
I am interested in thi…tag:zenith.aero,2019-10-10:2606393:Comment:6952462019-10-10T14:58:32.034Zgeo. keyes, jr.https://zenith.aero/profile/georgeekeyesjr
<p>John,</p>
<p></p>
<p>I am interested in this set-up as well. </p>
<p></p>
<p>my Jabiru 3300 has a 1/4" hub only. No torque lugs, and no prop extender. Did you get any information regarding the final attachment, fit-up and bolts to be used, from Jabiru? DUC? Aircraftspruce? Also, did you go with the Swirl-2, 3-blade, or 2-blade?</p>
<p></p>
<p>I am excited to see your progress. it seems like a very good choice.</p>
<p></p>
<p>Best,</p>
<p>geo.</p>
<p>John,</p>
<p></p>
<p>I am interested in this set-up as well. </p>
<p></p>
<p>my Jabiru 3300 has a 1/4" hub only. No torque lugs, and no prop extender. Did you get any information regarding the final attachment, fit-up and bolts to be used, from Jabiru? DUC? Aircraftspruce? Also, did you go with the Swirl-2, 3-blade, or 2-blade?</p>
<p></p>
<p>I am excited to see your progress. it seems like a very good choice.</p>
<p></p>
<p>Best,</p>
<p>geo.</p> I am building a RANS S-19 wit…tag:zenith.aero,2019-10-08:2606393:Comment:6952822019-10-08T17:16:21.357ZJohn McGlynnhttps://zenith.aero/profile/JohnMcGlynn345
<p>I am building a RANS S-19 with a JABIRU 3300A. I ordered a French DUC SWIRL (<a href="http://www.duc-helices.com/?lang=2" target="_blank">http://www.duc-helices.com/?lang=2</a>) prop from Aircraft Spruce. The US distributor is in Sebring FL and it is being shipped this week. Initially it was a real price performer but there was a price increase of about $450 bringing the cost to about $1600. Delivery was upwards of 2 months. Stay tuned!</p>
<p>I am building a RANS S-19 with a JABIRU 3300A. I ordered a French DUC SWIRL (<a href="http://www.duc-helices.com/?lang=2" target="_blank">http://www.duc-helices.com/?lang=2</a>) prop from Aircraft Spruce. The US distributor is in Sebring FL and it is being shipped this week. Initially it was a real price performer but there was a price increase of about $450 bringing the cost to about $1600. Delivery was upwards of 2 months. Stay tuned!</p> Since the wood is fixed-pitch…tag:zenith.aero,2019-08-08:2606393:Comment:6871612019-08-08T15:17:13.841ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>Since the wood is fixed-pitch, it's obviously a compromise between climb and cruise - a good "all around" prop. However, it's no contest vs the carbon fiber, since it is ground adjustable - you can set the pitch for either extreme or somewhere in-between.</p>
<p></p>
<p>John</p>
<p>Since the wood is fixed-pitch, it's obviously a compromise between climb and cruise - a good "all around" prop. However, it's no contest vs the carbon fiber, since it is ground adjustable - you can set the pitch for either extreme or somewhere in-between.</p>
<p></p>
<p>John</p> John, I have a wood prop I am…tag:zenith.aero,2019-08-08:2606393:Comment:6871582019-08-08T14:09:22.307ZJoe Scheibingerhttps://zenith.aero/profile/JoeScheibinger
<p>John, I have a wood prop I am going to sell but it's for the 650 with a Jabaru. Seeing that you have flown behind the wood prop and the carbon fiber prop, which one did you feel was better for performance?</p>
<p></p>
<p>John, I have a wood prop I am going to sell but it's for the 650 with a Jabaru. Seeing that you have flown behind the wood prop and the carbon fiber prop, which one did you feel was better for performance?</p>
<p></p> Here's a pic of the new cowl…tag:zenith.aero,2019-08-08:2606393:Comment:6871552019-08-08T13:07:56.812ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>Here's a pic of the new cowl design (photo taken May, 2014 - I don't know if there has been another design change since) It's supposed to prevent turbulence, especially at high angles of attack, from interfering with the exhausting cowl air and provide a better exhaust air path from the oil cooler:</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3414052813?profile=original" rel="noopener" target="_blank"><img class="align-full" src="https://storage.ning.com/topology/rest/1.0/file/get/3414052813?profile=RESIZE_710x" width="375"></img></a></p>
<p>The new design looks much more efficient with…</p>
<p>Here's a pic of the new cowl design (photo taken May, 2014 - I don't know if there has been another design change since) It's supposed to prevent turbulence, especially at high angles of attack, from interfering with the exhausting cowl air and provide a better exhaust air path from the oil cooler:</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/3414052813?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/3414052813?profile=RESIZE_710x" width="375" class="align-full"/></a></p>
<p>The new design looks much more efficient with less drag - I have the original cowl design and flush-riveted a 2" aluminum extension on the lip:</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/2170984178?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/2170984178?profile=RESIZE_710x" width="375" class="align-full"/></a></p>
<p>As far as the carb/airbox duct, I originally used SCAT but had uneven EGT's. I switched to a 90 degree bend smooth-bore radiator hose with a "straightener" between the hose and the carb. This resulted in more balanced EGT's. Pete at Jab USA gave me the "straightener." It was a section of aluminum tube with 4 internal vanes 90 degrees apart to smooth and straighten the airflow ... I don't know if Arion has them or not, but it wouldn't be too hard to fabricate one.</p>
<p></p>
<p>John</p> Hi Joe,
I've run a Sensenich…tag:zenith.aero,2019-08-08:2606393:Comment:6870242019-08-08T12:48:24.213ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>Hi Joe,</p>
<p></p>
<p>I've run a <a href="http://www.sensenich.com/shop/aircraft/2-blade-jabiru-3300-ground-adjustable-propeller/" rel="noopener" target="_blank">Sensenich carbon fiber ground adjustable prop</a> for about 300 hrs and have been very pleased with it. This prop is specifically designed for the Jab 3300. Each blade is molded in one piece with a hollow internal cavity so it is very light and strong. About the only criticism I have is that the pin/cylinder system that…</p>
<p>Hi Joe,</p>
<p></p>
<p>I've run a <a href="http://www.sensenich.com/shop/aircraft/2-blade-jabiru-3300-ground-adjustable-propeller/" target="_blank" rel="noopener">Sensenich carbon fiber ground adjustable prop</a> for about 300 hrs and have been very pleased with it. This prop is specifically designed for the Jab 3300. Each blade is molded in one piece with a hollow internal cavity so it is very light and strong. About the only criticism I have is that the pin/cylinder system that simultaneously adjusts the pitch of both blades is not precise enough to suit me - I turn the blades to the approximate pitch and then use a digital protractor to fine-tune the pitch (13 degrees for best cruise on my STOL 750) separately on each blade. It pays off since I was able to do a DynaVibe prop/engine balance and got it down to 0.03 ips !!! (< 0.1 ips is considered "good" and < 0.07 ips is supposedly below the limits of human perception of vibration).</p>
<p></p>
<p>While this prop isn't exactly cheap (I bought a slightly used prop fresh from a factory refurbishment, so it was same-as-new for a fantastically low price!), it has been superseded by an even more expensive model "for some applications." I "think" however, the prop I have is still the appropriate one for the STOL 750, so thankfully it is less-expensive! </p>
<p></p>
<p>If you have any questions, don't hesitate to call Sensenich. They'll usually put your call right through to an engineer or technician and are very patient answering questions and even willing to fabricate custom parts such as prop spacers, drive lugs, etc.</p>
<p></p>
<p>BTW, <a href="https://www.cumminspinners.com/" target="_blank" rel="noopener">Cummins Spinners</a> makes a beautiful aluminum spinner for this prop. Not exactly cheap, but it is a bolt-on and go part and saves hours of finishing and painting a fiberglass spinner. I bought my first Cummins spinner for my Sensenich wood prop from Jabiru USA (don't know if Arion, the new Jab dealer, has them or not) but bought the second Cummins spinner for the carbon fiber prop directly from Cummins for less $$, even though they're in Australia!</p>
<p></p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/2171015711?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/2171015711?profile=RESIZE_710x" width="375" class="align-full"/></a></p>
<p></p>
<p>BTW, there's nothing wrong with the Sensenich W68CK36 that is the base model for the FWF kit from Jabiru USA. Certainly not adjustable (but much less expensive, especially used!), but since it is wood, it is inherently smooth and certainly beautiful to look at! :>) Here's my original prop (just sold it this week!) with a Cummins spinner:</p>
<p><a href="https://storage.ning.com/topology/rest/1.0/file/get/2060759418?profile=original" target="_blank" rel="noopener"><img src="https://storage.ning.com/topology/rest/1.0/file/get/2060759418?profile=RESIZE_710x" width="375" class="align-full"/></a></p>
<p></p>
<p>John</p>
<p>N750A</p> Joe,
SCAT hose.
geo.tag:zenith.aero,2019-08-07:2606393:Comment:6870612019-08-07T18:53:35.298Zgeo. keyes, jr.https://zenith.aero/profile/georgeekeyesjr
<p>Joe,</p>
<p>SCAT hose.</p>
<p>geo.</p>
<p>Joe,</p>
<p>SCAT hose.</p>
<p>geo.</p> Geo, thanks for the advise. W…tag:zenith.aero,2019-08-07:2606393:Comment:6867262019-08-07T16:28:23.672ZJoe Scheibingerhttps://zenith.aero/profile/JoeScheibinger
<p>Geo, thanks for the advise. What kind of hose did you use between the airbox and the carburetor? I was thinking a cut down radiator hose with a 90 degree bend but their must be a better way! </p>
<p>Geo, thanks for the advise. What kind of hose did you use between the airbox and the carburetor? I was thinking a cut down radiator hose with a 90 degree bend but their must be a better way! </p> Joe,
i have that engine w a…tag:zenith.aero,2019-08-07:2606393:Comment:6869152019-08-07T16:01:34.817Zgeo. keyes, jr.https://zenith.aero/profile/georgeekeyesjr
<p>Joe,</p>
<p></p>
<p>i have that engine w a Sensenich Wooden Climb Prop... i would go w the Whirlwind Ground Adjustable as well. </p>
<p></p>
<p>Jabiru should answer your question regarding diameter, i.e. directly coupled and max engine rpm... tip speed being so critical. they have done prop studies w their 'approved' vendors... from what i've read.</p>
<p></p>
<p>they run perfectly and smooth... always watch for head/valve deterioration by removing the valve covers frequently... all valves…</p>
<p>Joe,</p>
<p></p>
<p>i have that engine w a Sensenich Wooden Climb Prop... i would go w the Whirlwind Ground Adjustable as well. </p>
<p></p>
<p>Jabiru should answer your question regarding diameter, i.e. directly coupled and max engine rpm... tip speed being so critical. they have done prop studies w their 'approved' vendors... from what i've read.</p>
<p></p>
<p>they run perfectly and smooth... always watch for head/valve deterioration by removing the valve covers frequently... all valves should look exactly the same without dark/hot... this will indicate problems way early. Also, i've read they have a newer cowl for the oil cooler. i'd be interested in photos of that... </p>
<p></p>
<p>Your install looks great so far! Keep us posted for future installers.</p>
<p></p>
<p>geo.</p>