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  #11  
Old 10-22-2012, 01:38 AM
Yen Yen is offline
 
Join Date: May 2010
Location: Benaraby Queensland. Australia
Posts: 225
Default Jab 3300

The 3300 Jab will come with all the cooling shrouds necessary, also fuel plumbing and exhaust. I found fitting a Jab engine to the Corby I built to be far far easier than fitting the 0-320 Lycoming to the RV4 i am building. The cooling shrouds are a right pain in the butt. The fuel plumbing fouls the engine mount, exhaust anf firewall. The actual engine mounts look as if they ere designed to be difficult, had to turn the bolts to torque them up.
If you do go with the jab, don't use mogas, unless you are very sure of its quality. I had a detonation problem when I couldn't get avgas.
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  #12  
Old 10-22-2012, 03:23 AM
madhun madhun is offline
 
Join Date: Jun 2010
Location: Buderim, Queensland Australia
Posts: 153
Default

I'd be inclined to have a good read up on the issues surrounding Jabi engines, which I wasn't too familiar with prior to attending a recent RA-AUS fly in at Monto (QLD); there wasn't too many complimentary discussions regarding what I thought was a widely accepted engine.
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  #13  
Old 10-22-2012, 06:48 AM
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KatieB KatieB is offline
 
Join Date: Jun 2010
Location: Belton, MO
Posts: 1,145
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Quote:
Originally Posted by madhun View Post
I'd be inclined to have a good read up on the issues surrounding Jabi engines, which I wasn't too familiar with prior to attending a recent RA-AUS fly in at Monto (QLD); there wasn't too many complimentary discussions regarding what I thought was a widely accepted engine.
The "issues" are due to improperly designed cowlings. Jabiru USA figured this out a decade ago. Cooling a Jabiru in a fast airplane such as the RV-3 would be easy. The CG would be the biggest challenge because it's such a light engine.

Good luck, I think it would look awesome with a long, sleek nose. Like a mini-Rocket.
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  #14  
Old 10-22-2012, 10:22 AM
JDRhodes JDRhodes is offline
 
Join Date: Feb 2008
Location: Taylorsville, GA
Posts: 748
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Quote:
Originally Posted by Lucky Clover View Post
Having to build on tight budget. Can get a new jabiru with fwf for $24000
We spent $10K on a mid time FWF Lycoming WITH and prop and baffle and exhaust. And it fit right on the RV mount and inside the RV cowling with no engineering. Is it brand new? No, but I haven't given it a second thought since it went on, the CG was right from Day 1, and with 1,100 hours to TBO, it'll probably give 10-15 years of flying.

I wouldn't consider a $24,000 engine if I was "building on a tight budget." Especially not an "alternative" engine.
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  #15  
Old 10-22-2012, 10:42 AM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,358
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The Sonex props might be reasonable starting places.

The cooling can be dealt with. A friend flies the 3300 and has had oil cooling issues but not cylinder head issues.

The main issues will be the CG and the new cowling.

Dave
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  #16  
Old 10-22-2012, 12:58 PM
RV3b Pilot RV3b Pilot is offline
 
Join Date: Sep 2012
Location: New Ulm,MN
Posts: 5
Smile Engine weight

I have a RV3b with a Corvair engine in it and it is much lighter than a Lycoming so I did several things to make it work out:
1st I used a RV4 cowl which is longer and I fitted it to the RV3 fuselage as far forward as I could get it and have it fit good. Then I fitted the engine to the cowl, that is backwards as most will mount the engine and then the cowl.
Then I made sure that every heavy object was as far forward as I could get it, even my battery is against the firewall.
I wanted to turbo charge my engine so that added some weight.
I made my own propeller hub out of 3/8" thick solid steel.
I made my own motor mount and added extra heavy pipes and weld plates.
My Corvair engine is only 178 cubic inches and I cruise at 190 MPH at 7,500 MSL and being turbo charged it goes even faster up higher! It is very smooth because it is a 6 cylinder engine like the one you want to put in your aircraft.
My weight and balance was right on but my aircraft is heavy becasue I wanted all the heavy gauges and radio, GPS, etc... 852 pounds empty...
You can do it if you want to and it will work out if you take your time and plan carefully. It took me 10 years and just over 3,000 hours of build time, about a 1,000 or so of those hours where just getting the engine to fit! It will add about one year to your building time to go with something other than a Lycoming.
With a Lycoming you can just purchase the parts and bolt them on. With any other engine you make all the parts, exhaust, intake, motor, mounts, accessories, etc....
Right now I am flying off my 40 hours and have had several mechanical issues that are specific to my engine installation. Today I lost an alternator belt in flight and because everything is such fit in the back of the engine it takes me about 5 to 6 hours to put on a new belt.
But there is nothing like having a true experimental aircraft and have it fly.
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  #17  
Old 10-22-2012, 01:47 PM
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dicel87 dicel87 is offline
 
Join Date: Jan 2005
Location: Kansas City, MO
Posts: 182
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Can you post some pictures of your corvair powered RV? Sure sounds interesting and truly experimental. Congrats on seeing your hard work pay off.
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  #18  
Old 10-22-2012, 07:02 PM
Lucky Clover Lucky Clover is offline
 
Join Date: Sep 2012
Location: Portales, NM
Posts: 7
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Thank for all the great advice. It gives me a lot to think about. As for the tight budget I only have about $35,000 set aside for engine and avionics and the misc. costs of the project.
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  #19  
Old 10-22-2012, 07:14 PM
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YellerDaisy YellerDaisy is offline
 
Join Date: May 2012
Location: Mountain Southwest
Posts: 225
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Quote:
Originally Posted by Lucky Clover View Post
Thank for all the great advice. It gives me a lot to think about. As for the tight budget I only have about $35,000 set aside for engine and avionics and the misc. costs of the project.
Wowsers!! Apparently "tight" is another one of those subjective words. I don't have that much in my ENTIRE RV-3B (with +200 hours in her).

I've done the experimental engine thing (successfully) and I've done the aircraft engine thing. My only advice is to consider very, very carefully how you really want to spend your time because there is no comparison. Take your most pessimistic estimate, double it, and add 50%. Head scratching time adds up really quick!
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RV-4 - 160HP O-320 - Sensenich GA
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  #20  
Old 10-22-2012, 07:40 PM
David Paule David Paule is offline
 
Join Date: Dec 2009
Location: Boulder, CO
Posts: 5,358
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Quote:
Originally Posted by RV3b Pilot View Post
I have a RV3b with a Corvair engine in it....
Right now I am flying off my 40 hours....
Congratulations! That's very impressive. How about some photos and more description?

Thanks,
Dave
RV-3B, on rudder now
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