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Old Oct 13, 2014, 10:52 AM
Hurts so good!
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I need engine size help

Can you help me with engine sizes? Physical size actually.

I bought another vintage 1/2A racing airplane kit. It will be my next build since I am liking the physical size of these airplanes. Usually around 36" wingspan.

Anyhow, the kit box says .049-.06 engines. So my very first thought was Norvel .61?
Then I see there is a Norvel Big Mig .074?
Now if you are like me you are thinking WOW that's 3/4 of a whole cubic inch!!! What a whopper!! J/k

Well actually I was thinking, I wonder if the .061 and the .074 engines are the same physical size? I have never had a Norvel and know nothing about these 1/2A engines except that I like them :-)

Can you help me choose an engine for this old racer plane? In exchange, I would be more than happy to post pictures here as I build it.
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Old Oct 13, 2014, 12:03 PM
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Western KY
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Here you go:
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Old Oct 13, 2014, 12:21 PM
Hurts so good!
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Thank you for that Andrew. That answers that. Not the same size physically.
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Old Oct 13, 2014, 01:06 PM
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The Norvel .074 can handle a larger prop (6x4-7x3) without any problems, plus it throttles well and the weight penalty over the .061 is not much to talk about. So the .074 engine is thereby much better suited for most regular sport applications if one uses the throttle sensibly.

The .061 prefers props around 5x3, and although it will easily spin this at around 22krpm, it just doesn't suit all planes.

If your racer really is a "racer" with a thin symmetric wing and low drag fuselage etc, then the .061 will do fine of course. A wingspan of 36" is pretty large though, something around 27-28" is better suited I think, depending on the profile etc too.
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Old Oct 13, 2014, 01:12 PM
Hurts so good!
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I wonder which engine would be more suited to the Pilot Ricky Rat racer?
I don't have the kit (which appears as if it has full size plans) in my possession yet.
So my concern is the physical size of the engine due to the box stating .049 - .06
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Old Oct 13, 2014, 02:31 PM
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I built one of these way back when also. I used a TD.
I am sure a norvel AME revlite version .061 would be a hoot in it. or any of the current russian combat engines or the VA .049 Vll. If I had the kit the VA would be my first choice then the revlite. Thing was fast on a stock TD. The VA would for sure haul the mail in it.
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Old Oct 13, 2014, 02:33 PM
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Do you have a year date idea when the plane was designed or kit was made?

I would go with the .074 hands down do to span and SQ / IN.
This being your second pylon plane you will want some speed you can always throttle back but if you are tapped out on throttle you can only wish.
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Old Oct 13, 2014, 02:49 PM
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Thanks Toad. I will Google that VA engine you reference (and get that OS engine packaged up for you )
Amp, I don't have the kit yet but will soon enough. When I get it, I will look for any kind of date on the kit/plans. I've never had a Pilot kit before so don't know if they're dated anywhere.
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Old Oct 13, 2014, 03:03 PM
Sailaire brethren
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cox TD .061?
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Old Oct 13, 2014, 04:07 PM
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United States, UT, Eagle Mountain
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Cox didnt make a td .061
I used the .049/.051
The Norvel .074 would fly it too slow in my opinion. you want a higher rev'er, like the REVLITE .061 AME if going with norvel
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Old Oct 13, 2014, 06:32 PM
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Quote:
Originally Posted by toad007 View Post
you want a higher rev'er, like the REVLITE .061 AME if going with norvel
I'm pretty sure that's the choice I will make. Due to cost alone.
How do you tell the revlite ame from other Norvels? I ask because there a couple norvel .061 r/c engines on eBay right now
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Old Oct 13, 2014, 06:56 PM
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the revlite has a black/ dark brown cyl and the fins have a larger dia than the older silver colored ones
the ame version is the higher rpm version. so you want the revlite ame .8 or 1.0 (.049/.061)
they come in rc version with a carb or the c/l version.

Here is a link to my site with a few pics and info on it
www.toadsrc.com/engines.htm
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Old Oct 13, 2014, 08:51 PM
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You can easily separate the older versions from the newer models by color and fin diameter as noted above. A quick indicator is that the fins are notched for the cylinder hold down screws on the older AAN models; the Big Mig cylinders have no notches -- the screws pass through holes in the fins.

You cannot distinguish the Big Mig models from the AMEs on the R/C versions -- you must count the intake ports; 5 round ports for the Big Mig, 3 larger oblong ports for the AME.

On the C/L version, most Big Migs have the NV slanted back at about a 30 degree angle; AMEs have the NV mounted at 90 degrees to the crank.
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Old Oct 14, 2014, 07:08 AM
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Do you have any other info about the plane, such as wing area, wing profile and thickness, and recommended total weight?

Here are some typical values for "sport-planes" where I have used these engines;

.049-.061; Around 27-28" wingspan, 160-180 square inch wing area, total weight around 10-15 oz.

.074; Around 36-38" wingspan, 230-250 square inch wing area, total weight around 19-22oz.
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Old Oct 14, 2014, 08:05 AM
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I will have more info when the model arrives
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