Matronics Email Lists Forum Index Matronics Email Lists
BBS Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

912 Prop

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Kitfox-List
View previous topic :: View next topic  
Author Message
jareds(at)verizon.net
Guest





PostPosted: Wed Feb 24, 2016 5:56 am    Post subject: 912 Prop Reply with 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



propellars_001.jpg
 Description:
 Filesize:  521.59 KB
 Viewed:  734 Time(s)

propellars_001.jpg



propellars_002.jpg
 Description:
 Filesize:  518.02 KB
 Viewed:  734 Time(s)

propellars_002.jpg


Back to top
peteohms



Joined: 31 Oct 2007
Posts: 223
Location: Leander, TX

PostPosted: Wed Feb 24, 2016 9:54 am    Post subject: 912 Prop Reply with quote

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

_________________
Pete
Leander, TX
Kitfox III, 912ul, Grove
Back to top
View user's profile Send private message Send e-mail
Guy Buchanan
Site Admin


Joined: 16 Jul 2006
Posts: 1193
Location: Ramona, CA

PostPosted: Wed Feb 24, 2016 12:40 pm    Post subject: 912 Prop Reply with quote

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
K-IV 1200 / 912Uls / Warp / 500 hours and flying again.
Now a glider pilot too.
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Kitfox-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group