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jareds(at)verizon.net
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 Posted: Wed Feb 24, 2016 5:56 am Post subject: 912 Prop |
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Have my choice between props.
Just wondering which prop is best for a 912 and prefer speed over climb.
Is there some place to call that would know?
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peteohms
Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX
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| Posted: Wed Feb 24, 2016 9:54 am Post subject: 912 Prop |
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I use an IVO ground adjustable.
Pete
On 2/24/2016 7:55 AM, jareds wrote:
| Quote: | Have my choice between props.
Just wondering which prop is best for a 912 and prefer speed over climb.
Is there some place to call that would know?
|
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
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_________________
Pete
Leander, TX
Kitfox III, 912ul, Grove |
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Wed Feb 24, 2016 12:40 pm Post subject: 912 Prop |
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Jared,
You're showing some weird props there. The square tips look like they might have come off a drone. I'll say, in general, that the longer a prop is the more "efficient" it is because of lower induced drag. (Think: glider wings.) The limitation on length is: 1) dragging it on the ground; and 2) running the tips supersonic. In general, with a 912, the prop RPM is so low you don't have to worry about #2 because #1 limits. Big however for the 912 is the mass inertia limitation. Since inertia varies as the mass times distance from the hub squared you might hit it with a really long 2-blade.
Second consideration is number of blades. In general, the fewer the blades the more efficient the prop. (Less dirty air.) However, many say that shorter, multi-blade props climb better, whereas longer, fewer blade props cruise faster. Not sure why, but I suspect it's because people over-prop with multi-blade props and subsequently run them flatter, giving better climb performance. (Prop thrust varies as the RPM squared, diameter ^3.5, and square root of pitch. Citation)
As to brand, I've seen several prop comparisons on 912s and have never seen an appreciable performance difference between any. (Prop design was very nearly standardized by the time of the Wright brothers.) This excludes the radical trans-sonic stuff more recently designed, none of which applies to our vehicles.
On 2/24/2016 5:55 AM, jareds wrote:
| Quote: | Have my choice between props.
Just wondering which prop is best for a 912 and prefer speed over climb.
Is there some place to call that would know?
|
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
|
_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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