---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Mon 11/14/11: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:06 AM - Re: Re: Sensnich ground adjustable prop on 912 (Gary Haley) 2. 09:48 AM - Re: Sensnich ground adjustable prop on 912 (Roger Lee) 3. 11:29 AM - Re: RotaxEngines-List Digest: No. of blades vs. prop diameter (John Goodings) 4. 02:59 PM - Re: Re: Sensnich ground adjustable prop on 912 (Gary Haley) 5. 06:43 PM - Re: Re: RotaxEngines-List Digest: No. of blades vs. prop diameter (FLYaDIVE) ________________________________ Message 1 _____________________________________ Time: 09:06:33 AM PST US From: "Gary Haley" Subject: Re: RotaxEngines-List: Re: Sensnich ground adjustable prop on 912 Roger, I have been following your posts for some time now on the Kolb list. I am an ex Kolb driver and now have a Highlander with a 912S "fuel injected" and a 74" Kiev. I've talked to Sensnich about a longer "up in the 70's" ground adjustable prop and they said they had one in development. Do you know anything about it? Gary Haley Dry Creek Airport, Cypress, TX (TS07) --- ssadiver1@yahoo.com wrote: From: "Roger Lee" Subject: RotaxEngines-List: Re: Sensnich ground adjustable prop on 912 Hi Chris, I am in the process of testing 5 Sensenich props for Sensenich and run a 68" 3 blade on my plane. I set all kinds of props up. Give me a call and I'll be happy to help you out. I can also help if you decide to purchase one. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=357745#357745 ________________________________ Message 2 _____________________________________ Time: 09:48:02 AM PST US Subject: RotaxEngines-List: Re: Sensnich ground adjustable prop on 912 From: "Roger Lee" Hi Gary, I have not seen a prop fro Sensenich in the 70's. I am currently testing a couple of 3 blades for them and a couple of 2 blades. Be careful about over propping with a 74+" prop. You have to have the torque and HP to turn it with an efficient pitch angle. You could get too long and have to reduce the pitch angle to a point to be a poor performer. You may also get to much inertia out at the tips for the 912 gearbox too. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=357835#357835 ________________________________ Message 3 _____________________________________ Time: 11:29:21 AM PST US From: John Goodings Subject: RotaxEngines-List: Re: RotaxEngines-List Digest: No. of blades vs. prop diameter We are currently using a 68" 3-blade GSC prop on our Zodiac 601HD with R912S. We are happy with it, but the ground clearance is not great for grass strips. I saw a recent reference to a Warp Drive 4-blade prop. If we went to a 4-blade prop, by how much would the prop diameter be reduced? John & Peter Goodings, C-FGPJ, CH601HD with R912S, Carp/Ottawa/Toronto. ________________________________ Message 4 _____________________________________ Time: 02:59:28 PM PST US From: "Gary Haley" Subject: Re: RotaxEngines-List: Re: Sensnich ground adjustable prop on 912 Roger, Thanks for the reply. I am happy with the Keiv and it's performance. I was just looking for a prop that could be changed easily. Gary --- ssadiver1@yahoo.com wrote: From: "Roger Lee" Subject: RotaxEngines-List: Re: Sensnich ground adjustable prop on 912 Hi Gary, I have not seen a prop fro Sensenich in the 70's. I am currently testing a couple of 3 blades for them and a couple of 2 blades. Be careful about over propping with a 74+" prop. You have to have the torque and HP to turn it with an efficient pitch angle. You could get too long and have to reduce the pitch angle to a point to be a poor performer. You may also get to much inertia out at the tips for the 912 gearbox too. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=357835#357835 ________________________________ Message 5 _____________________________________ Time: 06:43:31 PM PST US Subject: Re: RotaxEngines-List: Re: RotaxEngines-List Digest: No. of blades vs. prop diameter From: FLYaDIVE John: The rule of thumb for an aluminum prop is 2" per blade. So, reduce by 2" going from a 2 blade to a 3 blade and another 2" going to a 4 blade. NOW! The pitch INCREASES 1" above MAX when going from a 2 blade to a 3 blade... So, if you were at 60" of pitch on a 2 blade you go to a 61" on a three blade and then a 63" on a 4 blade. The other rule of thumb is: You will loose 50 RPM for every inch of increase pitch and gain 50 RPM for every inch of decrease in diameter. The ONLY final test is TEST - TEST - TEST. Barry On Mon, Nov 14, 2011 at 2:26 PM, John Goodings wrote: > > We are currently using a 68" 3-blade GSC prop on our Zodiac 601HD with > R912S. We are happy with it, but the ground clearance is not great for > grass strips. I saw a recent reference to a Warp Drive 4-blade prop. If > we went to a 4-blade prop, by how much would the prop diameter be reduced? > > John & Peter Goodings, C-FGPJ, CH601HD with R912S, Carp/Ottawa/Toronto. > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.