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  #1  
Old 06-23-2020, 10:22 PM
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Saber25 Saber25 is offline
 
Join Date: Dec 2010
Location: Colorado
Posts: 225
Default Optimum engine

My good friend and meticulous builder is assembling an RV9-A for his son who's in his forties. This airplane will include all the bells and whistles, padded interior, auto-pilot and latest in panel technology. I've been following the progress since my friend is in the hangar next to me I've concluded this baby is going to be a bit on the chubby side when completed. The son is having an 0-320 Lyc with a fixed pitch Sensenich installed.

What say you RV9-A drivers... is this installation optimum or what is the normal?

Thanks for replies and guidance.

Cheers, Hans
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  #2  
Old 06-24-2020, 01:04 AM
Bevan Bevan is offline
 
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Location: BC
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If it doesnít have fuel injection, electronic ignition and a CS prop, it doesnít have all the bells and whistles. Flame suit is on!

Bevan
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O-360-A1F6 (parallel valve) 180HP
Dual P-mags
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  #3  
Old 06-24-2020, 06:12 AM
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Saber25 Saber25 is offline
 
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I was thinking in terms of performance and possible resale at some time. I've got a bare bones RV4 so my 0-320/FP performance for the past 31 years is quite satisfying. The RV9-A with this same engine/prop combination may not be the best solution considering the investment firewall aft that's being planned. Surely some of the 9-A's can chime in as to their experience.

Thanks for any user input.
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"There's a big difference between a pilot and an aviator. One is a technician, the other is an artist in love with flight."
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  #4  
Old 06-24-2020, 07:12 AM
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PaulvS PaulvS is offline
 
Join Date: Aug 2019
Location: Western Australia
Posts: 237
Default No problem

O-320 is normal for the RV-9/A and Vans discourages anything bigger. The prototype flew with an O-235 so an O-320 should be plenty for typical use.
I fly a -9A with a Sensenich FP and it is great. I don't think it needs a CSU, though it would help to slow down some for landing.
I'm sure your neighbour will be happy with it the way it is being buillt!
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Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
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  #5  
Old 06-24-2020, 08:02 AM
kaweeka kaweeka is offline
 
Join Date: May 2011
Location: Roseville
Posts: 368
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FWIW (and this is absolutely a personal opinion rather than objective) I prefer an injected engine if for no other reason than I regularly fly LOP. I feel the 320 is enough performance and would stay with Vans recommendations. Electronic ignition is a good option. The discussion of fixed vs. CS props are a bit more fluid, weight vs. cruise vs. climb vs. maintenance and are for those folks smarter than I.

Kind regards,
David
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Last edited by kaweeka : 06-24-2020 at 08:05 AM.
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  #6  
Old 06-24-2020, 10:22 AM
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rzbill rzbill is offline
 
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This reminds me of a cartoon in Sport Aviation from years ago that showed an R-985 mounted in a BD5. I think that was about optimum.
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RV-7A: Flying since April 15, 2012. 850 hrs
YIO-360-M1B, mags, CS, GRT EX and WS H1s & A/P, Navworx
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  #7  
Old 06-24-2020, 10:33 AM
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Saber25 Saber25 is offline
 
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Thanks guys, I'll pass the per plans recommendation to my friend. Good to hear from current owners of the 9A.
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Build 'em light, keep it simple

I'd rather fly than tinker.

"There's a big difference between a pilot and an aviator. One is a technician, the other is an artist in love with flight."
- Elrey B. Jeppesen,
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  #8  
Old 06-24-2020, 11:00 AM
tjo tjo is offline
 
Join Date: Dec 2009
Location: La Center,wa
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As with most everything, I think the correct answer is, "it depends." I am building a 9, so no direct experience yet beyond flying the factory demo plane, but a few thoughts that may help:
1) a 9, even a slightly heavy one, with an O-320 FP will perform just fine. Maybe that's good enough.
2) Just because the empty weight is slightly high, the gross, if you stay with the Vans recommended gross, is still the same.
3) There is very little cost difference between an O-320 and O-360
4) There is also very little weight difference between the two.
5) I see you are in Colorado. If high DA operations are part of the plan then a CS prop may need some consideration for short field performance.

Tim
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  #9  
Old 06-24-2020, 11:44 AM
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Plummit Plummit is offline
 
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Default IO-540

Would be nice, especially with a constant speed!

-Marc
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  #10  
Old 06-24-2020, 11:57 AM
Dave12 Dave12 is offline
 
Join Date: Oct 2010
Location: Elkton, Md.
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I have a 9A with some of the bells and whistles. Pmags,FI,CSP,165 hp io 320 and it rocks. But, Iím a flatlander. If I were in Colorado, Iíd want a 360 ci.. The CSP will climb better and slow down better which is nice. The IO will allow lop operations which pay good dividends. Hard to beat a 9.
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