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Old 01-25-2018, 12:44 PM
dlomheim dlomheim is offline
Join Date: Sep 2006
Location: (2OK2) OK City, OK
Posts: 370
Default Radial Conversions RV-3?

Question...are any of you all who are now building, considering a ROTEC radial engine installation by chance? It seems that that 150 hp engine would be a neat installation in a "3"; and works okay in an "8" but (IMO) could use a bit more power (turbo-normalize, etc.). The Radial Conversions RV-8R builder / owner (search on facebook) is now starting to develop "firewall forward" installation packages for RV's, so check it out if you're interested in a cool sounding a/c.

Doug Lomheim
RV-3A sold
RV-9A Mazda 13B, FWF
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Old 01-25-2018, 12:57 PM
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Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 11,823

I think the Radial -8 is pretty neat - I got to see it long before it flew, and then several times after - butthe firwwall on an -8 is much bigger than on a -3, and even at that, he had to make the firewall bigger. I think such an installation would be a wee bit of a monstrosity Doug - and have less horsepower than the IO-320 we’re flying.....
Paul F. Dye
Editor in Chief - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
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Old 01-25-2018, 01:05 PM
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pazmanyflyer pazmanyflyer is offline
Join Date: Jul 2007
Location: Litchfield Park, AZ
Posts: 876
Default Radial -6

There's this guy too!

Carlos in Arizona
EAA Chapter 538 President,
Wittman Tailwind W8 N53CH (built & sold)
Pazmany PL-1 N2029 (bought & sold)
RV7 - N537TC (reserved & building)
Emp, Wings & Fuse done - working on FWF

"The air is an extremely dangerous, jealous and exacting mistress. Once under the spell most lovers are faithful to the end, which is not always old age." - Winston Churchill
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Old 01-25-2018, 03:22 PM
Join Date: Mar 2008
Location: Seattle
Posts: 1,390

I have a Yak-55. I fly it for the AWESOME aerobatics. It has a radial engine, part of the reason it flies so well.
I have an RV-8 that I built. I would never want it with a radial engine. The airframe was designed for a Lycoming, and silly me...I installed a Mazda Turbo Rotary engine. It added about 5 YEARS to the build time, and about 70 pounds to the plane. The extra 30 horsepower was nice, but 16 flight hours later I realized that 'engine development' is a full time operation. The engine cowl must be removed on almost every flight to inspect EVERYTHING.
I expect a ROTEC or VERNER radial might not require as much inspection, but the airframe mods will take away much of the 'good' of an RV:
-Good visibility over the nose.
-Good speed ratio, low stall speed/high top speed.
-Good proportion - The light weight radial will be mounted too far forward on a long mount.
-Good progress during building - adding YEARS to a build is a big drag, I know.
One RV-3 has an Walter LOM inline 4.
Which looks good. I appreciate different engine configurations, but they should match the airframe. Look at the Boeing P-26 and Grumman Wildcat; great looking radial engine single seaters have round fuselages.
Still, I wouldn't want to discourage a creative builder. Perhaps it would be a winner!
Scott Emery
EAA 668340, chapter 326 & IAC chapter 67
RV-8 N89SE first flight 12/26/2013
Yak55M, and the wife has an RV-4
There is nothing-absolute nothing-half so much worth doing as simply messing around with Aeroplanes
(with apologies to Ratty)
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Old 01-28-2018, 11:05 AM
dlomheim dlomheim is offline
Join Date: Sep 2006
Location: (2OK2) OK City, OK
Posts: 370
Default Radial + RV-3

Originally Posted by Ironflight View Post
...I think such an installation would be a wee bit of a monstrosity Doug.....
You're probably right Paul...but that radial sound is pretty cool!
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Old 01-28-2018, 12:42 PM
David Paule David Paule is offline
Join Date: Dec 2009
Location: Boulder, CO
Posts: 3,759

For a while I had an Anzani radial and the thought did cross my mind.

It might not look too bad.... but the reliability would have been dreadful. Well, the performance, too....

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Old 01-28-2018, 02:22 PM
TS Flightlines TS Flightlines is offline
Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,224

We've been helping Brian at Radial Conversions on some FWF stuff. Quite a few things in development.

Scott in Maui----gotta love it!!!

Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC,
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Old 02-15-2018, 11:13 PM
CAVU Mark CAVU Mark is offline
Join Date: Dec 2014
Location: San Diego, CA
Posts: 92
Default Make mine a Zero

I Vans made a Zero I would put the Rotec in it and a the ZERO grin, no question. Love the sound of a radial.

RV-3 restored
Stearman - airworthy - first fight ferry to LA for DAR - March 27, 2019 Yeah! No squawks.
L3 building for San Diego Air and Space Museum
Helio Courier constructing
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Old 02-16-2018, 05:33 AM
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DanH DanH is offline
Join Date: Oct 2005
Location: 08A
Posts: 8,304

If you really want a radial -3, you might look at 7 or 9 cylinder Verner.
Dan Horton
Barrett IO-390
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