---------------------------------------------------------- Kolb-List Digest Archive --- Total Messages Posted Tue 06/09/15: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:16 AM - Re: Prop Hub Extension? (B Young) 2. 07:11 AM - Re: Prop Hub Extension? (Jody Morgan) 3. 07:47 AM - Re: Prop Hub Extension? (jody morgan) 4. 11:45 AM - Re: Prop Hub Extension? (B Young) 5. 02:57 PM - Re: Prop Hub Extension? (kinne russ) 6. 03:16 PM - Re: Prop Hub Extension? (B Young) 7. 09:44 PM - Re: 447 prop (wakataka) ________________________________ Message 1 _____________________________________ Time: 06:16:57 AM PST US Subject: Re: Kolb-List: Prop Hub Extension? From: B Young Jody I have a mark3 with a 912. It mounted ok with enough clearance for the prop and ran ok.. but when I added a 3 inch prop extension I ended up with two benefits. 1. Ended up with 2 to 3 mph faster speed. 2. It cut the noise in the cabin enough to be worth the time and expense. I think rotax said that 4 inch extension was the maximum you could go. Hope this is helpful. Boyd Young. Mk3c. Utah On Jun 8, 2015 6:18 PM, "jody morgan" wrote: > > Hey All, >> >> Does the 912 need a prop hub extension when mounted to the M3C or M3X? >> Wanting to mount the Suzuki 1.3 with Raven Redrive on the M3X I'm >> building, but the Raven Redrive will not accept a prop hub extension. >> >> Trying to match the distance from the 912 to the prop without an >> extension to match the distance for the Suzuki, so if the 912 requires a >> prop hub extension when moounted to the M3X it would change my whole set up >> calculations or maybe eliminate the Suzuki with that Redrive. >> >> Tried to look it up in the archives but haven't got that figured out yet. >> >> If it does require a prop hub extension, how long of one does it need? >> >> Thanks in advance for any help. >> Jody >> >> >> >> >> >> ========== >> -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List >> ========== >> FORUMS - >> _blank">http://forums.matronics.com >> ========== >> b Site - >> -Matt Dralle, List Admin. >> target="_blank">http://www.matronics.com/contribution >> ========== >> >> >> >> > * > > > * > > ________________________________ Message 2 _____________________________________ Time: 07:11:29 AM PST US Subject: Re: Kolb-List: Prop Hub Extension? From: Jody Morgan Thanks Boyd Very helpful. Jody Sent from my iPhone On Jun 9, 2015, at 6:16 AM, B Young wrote: > Jody > > I have a mark3 with a 912. It mounted ok with enough clearance for the p rop and ran ok.. but when I added a 3 inch prop extension I ended up with t wo benefits. > 1. Ended up with 2 to 3 mph faster speed. > 2. It cut the noise in the cabin enough to be worth the time and expense. > I think rotax said that 4 inch extension was the maximum you could go. > Hope this is helpful. > Boyd Young. Mk3c. Utah > > On Jun 8, 2015 6:18 PM, "jody morgan" wrote: >> >>> Hey All, >>> >>> Does the 912 need a prop hub extension when mounted to the M3C or M3X? >>> Wanting to mount the Suzuki 1.3 with Raven Redrive on the M3X I'm buildi ng, but the Raven Redrive will not accept a prop hub extension. >>> >>> Trying to match the distance from the 912 to the prop without an extensi on to match the distance for the Suzuki, so if the 912 requires a prop hub e xtension when moounted to the M3X it would change my whole set up calculatio ns or maybe eliminate the Suzuki with that Redrive. >>> >>> Tried to look it up in the archives but haven't got that figured out yet .. >>> >>> If it does require a prop hub extension, how long of one does it need? >>> >>> Thanks in advance for any help. >>> Jody >>> >>> >>> >>> >>> >>> ========== >>> -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List >>> ========== >>> FORUMS - >>> _blank">http://forums.matronics.com >>> ========== >>> b Site - >>> -Matt Dralle, List Admin. >>> target="_blank">http://www.matronics.com/contribution >>> ========== >> >> >> >> get="_blank">http://www.matronics.com/Navigator?Kolb-List >> tp://forums.matronics.com >> _blank">http://www.matronics.com/contribution >> > > > ========================== ========= ========================== ========= ========================== ========= ========================== ========= > ________________________________ Message 3 _____________________________________ Time: 07:47:25 AM PST US Subject: Re: Kolb-List: Prop Hub Extension? From: jody morgan Boyd, What prop are you using? Jody On Tue, Jun 9, 2015 at 6:16 AM, B Young wrote: > Jody > > I have a mark3 with a 912. It mounted ok with enough clearance for the > prop and ran ok.. but when I added a 3 inch prop extension I ended up > with two benefits. > 1. Ended up with 2 to 3 mph faster speed. > 2. It cut the noise in the cabin enough to be worth the time and expense. > I think rotax said that 4 inch extension was the maximum you could go. > Hope this is helpful. > Boyd Young. Mk3c. Utah > On Jun 8, 2015 6:18 PM, "jody morgan" wrote: > >> >> Hey All, >>> >>> Does the 912 need a prop hub extension when mounted to the M3C or M3X? >>> Wanting to mount the Suzuki 1.3 with Raven Redrive on the M3X I'm >>> building, but the Raven Redrive will not accept a prop hub extension. >>> >>> Trying to match the distance from the 912 to the prop without an >>> extension to match the distance for the Suzuki, so if the 912 requires a >>> prop hub extension when moounted to the M3X it would change my whole set up >>> calculations or maybe eliminate the Suzuki with that Redrive. >>> >>> Tried to look it up in the archives but haven't got that figured out yet. >>> >>> If it does require a prop hub extension, how long of one does it need? >>> >>> Thanks in advance for any help. >>> Jody >>> >>> >>> >>> >>> >>> ========== >>> -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List >>> ========== >>> FORUMS - >>> _blank">http://forums.matronics.com >>> ========== >>> b Site - >>> -Matt Dralle, List Admin. >>> target="_blank">http://www.matronics.com/contribution >>> ========== >>> >>> >>> >>> >> * >> >> get="_blank">http://www.matronics.com/Navigator?Kolb-List >> tp://forums.matronics.com >> _blank">http://www.matronics.com/contribution >> >> * >> >> * > > > * > > ________________________________ Message 4 _____________________________________ Time: 11:45:06 AM PST US Subject: Re: Kolb-List: Prop Hub Extension? From: B Young 68 inch warp drive 3 blade... can't remember but I think it is pitched near 8 1/2. To 9deg. I am at 4200 feet sea level. Using the 80 hp 912 On Jun 9, 2015 8:49 AM, "jody morgan" wrote: > Boyd, > > What prop are you using? > > Jody > > On Tue, Jun 9, 2015 at 6:16 AM, B Young wrote: > >> Jody >> >> I have a mark3 with a 912. It mounted ok with enough clearance for the >> prop and ran ok.. but when I added a 3 inch prop extension I ended up >> with two benefits. >> 1. Ended up with 2 to 3 mph faster speed. >> 2. It cut the noise in the cabin enough to be worth the time and expense. >> I think rotax said that 4 inch extension was the maximum you could go. >> Hope this is helpful. >> Boyd Young. Mk3c. Utah >> On Jun 8, 2015 6:18 PM, "jody morgan" wrote: >> >>> >>> Hey All, >>>> >>>> Does the 912 need a prop hub extension when mounted to the M3C or M3X? >>>> Wanting to mount the Suzuki 1.3 with Raven Redrive on the M3X I'm >>>> building, but the Raven Redrive will not accept a prop hub extension. >>>> >>>> Trying to match the distance from the 912 to the prop without an >>>> extension to match the distance for the Suzuki, so if the 912 requires a >>>> prop hub extension when moounted to the M3X it would change my whole set up >>>> calculations or maybe eliminate the Suzuki with that Redrive. >>>> >>>> Tried to look it up in the archives but haven't got that figured out >>>> yet. >>>> >>>> If it does require a prop hub extension, how long of one does it need? >>>> >>>> Thanks in advance for any help. >>>> Jody >>>> >>>> >>>> >>>> >>>> >>>> ========== >>>> -List" target="_blank">http://www.matronics.com/Navigator?Kolb-List >>>> ========== >>>> FORUMS - >>>> _blank">http://forums.matronics.com >>>> ========== >>>> b Site - >>>> -Matt Dralle, List Admin. >>>> target="_blank">http://www.matronics.com/contribution >>>> ========== >>>> >>>> >>>> >>>> >>> * >>> >>> get="_blank">http://www.matronics.com/Navigator?Kolb-List >>> tp://forums.matronics.com >>> _blank">http://www.matronics.com/contribution >>> >>> * >>> >>> * >> >> get="_blank">http://www.matronics.com/Navigator?Kolb-List >> tp://forums.matronics.com >> _blank">http://www.matronics.com/contribution >> >> * >> >> > * > > > * > > ________________________________ Message 5 _____________________________________ Time: 02:57:40 PM PST US From: kinne russ Subject: Re: Kolb-List: Prop Hub Extension? Boyd If you have time can you tell me where you got your prop extension? Thanx Russ K > On Jun 9, 2015, at 9:16 AM, B Young wrote: > > Jody > > I have a mark3 with a 912. It mounted ok with enough clearance for the prop and ran ok.. but when I added a 3 inch prop extension I ended up with two benefits. > 1. Ended up with 2 to 3 mph faster speed. > 2. It cut the noise in the cabin enough to be worth the time and expense. > I think rotax said that 4 inch extension was the maximum you could go. > Hope this is helpful. > Boyd Young. Mk3c. Utah > ________________________________ Message 6 _____________________________________ Time: 03:16:12 PM PST US Subject: Re: Kolb-List: Prop Hub Extension? From: B Young It was discussed on the list and a member of the list offered to turn it on his lathe and do it for the cost of materials.... right now I can't think of his name,, but I haven't seen his name on the list for years. He asked what I wanted and I drew a scale drawing. He liked my drawing better than what he had seen. I think he made him one like he did for me. Boyd On Jun 9, 2015 3:59 PM, "kinne russ" wrote: > Boyd > If you have time can you tell me where you got your prop extension? > Thanx > Russ K > > On Jun 9, 2015, at 9:16 AM, B Young wrote: > > Jody > > I have a mark3 with a 912. It mounted ok with enough clearance for the > prop and ran ok.. but when I added a 3 inch prop extension I ended up > with two benefits. > 1. Ended up with 2 to 3 mph faster speed. > 2. It cut the noise in the cabin enough to be worth the time and expense. > I think rotax said that 4 inch extension was the maximum you could go. > Hope this is helpful. > Boyd Young. Mk3c. Utah > > > * > > > * > > ________________________________ Message 7 _____________________________________ Time: 09:44:22 PM PST US Subject: Kolb-List: Re: 447 prop From: "wakataka" I run a 66" Warp drive on a B box behind a 377. It's a very smooth and extremely durable prop. But the Warp Drive prop is heavy. It likely has a moment of inertia more than the B gearbox is rated for. That said, if you just keep the idle speed up around 2,000 rpm you can avoid the damaging resonance that occurs at low speeds. This is true with any prop on a Rotax 2 stroke. That chatter you hear a low idle speed is the knuckle joint attempting to absorb the resonant energy pulses between the prop and the engine. You don't want to be hearing that sound on a regular basis. Just set the idle speed up until it goes way. A fast idle may have you moving faster than you'd like on the taxiway, but it's much cheaper to replace brake pads than gearbox parts. And I've never had a forced landing due to worn out brake pads. -------- There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact. 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