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  #1  
Old 04-16-2017, 02:56 PM
salto salto is offline
 
Join Date: Apr 2015
Location: Wee Waa Australia
Posts: 212
Default MT Propeller recommendation

After supplying required information to MT in Germany here is their recommendation.
I was trying to get a four blade(cool factor only) after reading about the performance they are achieving (no real performance advantage)
They came back with 74in three blade.

Type: MTV-12-B/188-59f
+ Spinner Assy P-469-2
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  #2  
Old 04-16-2017, 04:23 PM
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mike newall mike newall is offline
 
Join Date: Jan 2005
Location: Yorkshire, England
Posts: 1,261
Default

RV14

IO-390

MTV-12-B/188-59f

Mmmmmmmmmmm

4 Blades are for the pure aero boys !
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  #3  
Old 04-16-2017, 08:11 PM
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johnbright johnbright is offline
 
Join Date: Aug 2010
Location: Newport News, Va
Posts: 66
Default Cowling

Does a three blade prop complicate cowling removal?
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  #4  
Old 04-16-2017, 08:27 PM
Driving '67 Driving '67 is offline
 
Join Date: Dec 2011
Location: Oakville, ON Canada
Posts: 137
Default

Love the look of the 3 blade prop! If you don't mind me asking, is there much of a price differential between the Hartzell and the MT prop. Any operational restrictions (ie certain rpm ranges)?

Thanks Jim
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  #5  
Old 04-16-2017, 09:55 PM
salto salto is offline
 
Join Date: Apr 2015
Location: Wee Waa Australia
Posts: 212
Default

Current quote I have for MT is 9,700 euros plus freight.
Don't have a price on other 3 blade props.
They state that it is 29lb lighter than an aluminium one. Not sure what that would do to weight and balance.
Don't have weight yet to do W&B.
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  #6  
Old 04-16-2017, 11:17 PM
Evolution10 Evolution10 is offline
 
Join Date: Jun 2014
Location: oregon
Posts: 86
Default

Yes, the 3 blade does complicate cowl removal (when my hub goes, I will go back to a 2 blade). It makes it very difficult to get off, especially if you have engine extras.
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  #7  
Old 04-16-2017, 11:38 PM
rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 6,513
Default

Quote:
Originally Posted by johnbright View Post
Does a three blade prop complicate cowling removal?
Yes it does (though there are mods that can be made to make it not too much more difficult)

Quote:
Originally Posted by salto View Post
They state that it is 29lb lighter than an aluminium one. Not sure what that would do to weight and balance.
Don't have weight yet to do W&B.
Pretty simple.... It will move the empty C.G. further aft than it it would be if a Hartzell prop. was used.
It is a pretty simple W&B calculation using the published W&B sample and the different weights for the different propellers to calculate what the difference would be.
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  #8  
Old 04-17-2017, 04:03 AM
salto salto is offline
 
Join Date: Apr 2015
Location: Wee Waa Australia
Posts: 212
Default

Yes agree Scott just not sure if it puts it past the aft balance line as I don't have the prop weight yet. Might be a no go just not sure yet.
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wings almost complete.
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  #9  
Old 04-17-2017, 08:33 PM
Chattin35 Chattin35 is offline
 
Join Date: Jul 2014
Location: Boise, ID
Posts: 179
Default Zero cool factor, but...

The most efficient prop will have 1 blade.
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  #10  
Old 04-18-2017, 01:33 AM
paul330 paul330 is offline
 
Join Date: Feb 2007
Location: Mpumalanga, South Africa
Posts: 928
Default

I have the 3-blade MT on my -10 and I can tell you it is super-smooth. Everyone who has flown behind a 2-blade prop comments. Also, there are no resonance issues so no limited RPM bands.

Yes, the bottom cowl removal is a little more difficult but not excruciatingly so. I assume the -14 has a similar arrangement. You just need to extend the gear slot and fit in a cover plate. With a tailwheel, I guess there wouldn't be an issue at all. Thinks - why didn't VANS produce a tailwheel version of the -10?

It is also, apparently, a few knots slower in the cruise, but another plus is that you get a couple of inches extra ground clearance.
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