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
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| Subject: | Re: Prop Hub Extension? |
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" <jodymorgan@earthlink.net> 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
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>> ==========
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>> -Matt Dralle, List Admin.
>> target="_blank">http://www.matronics.com/contribution
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>>
>>
>>
>>
> *
>
>
> *
>
>
Message 2
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| Subject: | Re: Prop Hub Extension? |
Thanks Boyd
Very helpful.
Jody
Sent from my iPhone
On Jun 9, 2015, at 6:16 AM, B Young <byoungplumbing@gmail.com> 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" <jodymorgan@earthlink.net> 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
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| Subject: | Re: Prop Hub Extension? |
Boyd,
What prop are you using?
Jody
On Tue, Jun 9, 2015 at 6:16 AM, B Young <byoungplumbing@gmail.com> 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" <jodymorgan@earthlink.net> 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 <http://www.matronics.com/Navigator?Kolb-List>
>> tp://forums.matronics.com <http://forums.matronics.com>
>> _blank">http://www.matronics.com/contribution <http://www.matronics.com/contribution>
>>
>> *
>>
>> *
>
>
> *
>
>
Message 4
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| Subject: | Re: Prop Hub Extension? |
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" <jodymorgan@earthlink.net> wrote:
> Boyd,
>
> What prop are you using?
>
> Jody
>
> On Tue, Jun 9, 2015 at 6:16 AM, B Young <byoungplumbing@gmail.com> 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" <jodymorgan@earthlink.net> 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 <http://www.matronics.com/Navigator?Kolb-List>
>>> tp://forums.matronics.com <http://forums.matronics.com>
>>> _blank">http://www.matronics.com/contribution <http://www.matronics.com/contribution>
>>>
>>> *
>>>
>>> *
>>
>> get="_blank">http://www.matronics.com/Navigator?Kolb-List <http://www.matronics.com/Navigator?Kolb-List>
>> tp://forums.matronics.com <http://forums.matronics.com>
>> _blank">http://www.matronics.com/contribution <http://www.matronics.com/contribution>
>>
>> *
>>
>>
> *
>
>
> *
>
>
Message 5
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| Subject: | Re: 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 <byoungplumbing@gmail.com> 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
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| Subject: | Re: Prop Hub Extension? |
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" <russk50@gmail.com> 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 <byoungplumbing@gmail.com> 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
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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.
Mark Twain
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=443326#443326
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