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08-29-2016, 05:17 AM
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Join Date: Aug 2016
Location: Perth
Posts: 7
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IO-390 2/3 Blade Fixed Pitch
Hi All
Does anybody know the logistics/availability of a 3 (preferred) or 2 Blade Fixed Pitch propeller for the IO-390 installed in RV-14?
I'd like to stay away from variable pitch and the associated components/complexity.
Thanks
Dan
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08-29-2016, 07:23 AM
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Join Date: Jul 2014
Location: Cincinnati, OH
Posts: 77
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I asked Van's about this a while back. They stated there will be no fixed pitch option for the RV-14a, with only this explanation: "the wide speed range argues for a constant speed prop."
The issue may be that the RV-14A is so overpowered compared to most spam cans one can think of, that one has to consider the possibility with fixed pitch prop of trouble slowing down on approach even with the throttle at idle.
I reluctantly concluded that, for me anyway, building what Van's designed is probably the preferable, albeit expensive, way to go, should I win the lottery.
-Paragon
Cincinnati, OH
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08-29-2016, 07:38 AM
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Join Date: Aug 2016
Location: Perth
Posts: 7
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Thanks Paragon for the informative response, I presumed this question must have been asked of Vans before, thanks again.
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08-29-2016, 09:32 AM
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Join Date: Jan 2005
Location: Hazlehurst, GA
Posts: 1,359
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Craig Catto
I'd talk to Craig Catto. He has forgotten more than most will ever know about FP props.
__________________
IHN,
2020 Dues Paid
Robby Knox
THEM: Why do you always carry a knife?
ME: I can't open a bag of chips with my Glock!
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08-29-2016, 12:59 PM
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Join Date: Jan 2005
Location: Twin Cities, MN
Posts: 1,565
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Quote:
Originally Posted by Paragon
I asked Van's about this a while back. They stated there will be no fixed pitch option for the RV-14a, with only this explanation: "the wide speed range argues for a constant speed prop."
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That doesn't make any sense. The RV-7 and RV-8, for example, have a wider speed range than the -14 yet have fixed pitch numbers quoted.
__________________
Brad Benson, Maplewood MN.
RV-6A N164BL, Flying since Nov 2012!
If you're not making mistakes, you're probably not making anything
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08-30-2016, 08:13 AM
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Join Date: Jun 2014
Location: Ottawa, ON, Canada
Posts: 353
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When I asked (in some other thread you may be able to find, th eone on RV-14 engine choices I think ...), the issue of CG was brought up as a potential challenge to putting a lighter FP prop on the nose, which would be especially true of a 2 blade ... you might be able to work around a 3 blade however ...
__________________
J.F.
Sling 4 empennage kit on order!
Future EAA 245 Member (Hopefully)
Current Piper Warrior PA-28-151 Owner/Pilot
Ottawa, Ontario, Canada
http://www.sling4.ninja
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08-30-2016, 09:03 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Welcome to VAF!
Daniel-----welcome aboard the good ship VAF 
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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09-03-2016, 10:15 PM
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Join Date: Aug 2016
Location: Perth
Posts: 7
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Thanks Mike for the welcome. And thanks to everyone else for the input. I had almost convinced myself that CS was going to be the only option. However It now looks like there might be a good 3 blade FP option. Its early days but will post details when they become available.
Cheers
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09-03-2016, 10:58 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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As already hinted at, a fixed pitch prop to handle the power would not be the problem. The weight of the prop and the C.G. problems it would cause, would be. A three blade would be heavier than a two blade but still way lighter than a constant speed.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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