"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

What engine, what size?

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Old 01-07-2014, 11:24 AM
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shd3920
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Question What engine, what size?

I just acquired this 1/2a scale motor that did not come with an original box or manual or any specifics.
Measures 2" from tip of glow plug to bottom of motor, and 2 3/8" from tip of shaft to rear of motor. Muffler is a tiny 1 1/2" long.
The only marks are a AMA-10 stamp (seen clearly in the photos) on the left side, and a cross symbol stamp on the right side (see last photo)
If someone could please tell me the size and make and other specifics please help.

Thank you
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Old 01-07-2014, 11:35 AM
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Looks like a Norvel, 1cc, pre-revlite. These are very good engines
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Old 01-07-2014, 11:51 AM
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Someone wrote on the back of the motor in permanent ink "1.0 PY"
Does this mean anything?
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Old 01-07-2014, 11:53 AM
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Quote:
Originally Posted by Mr Cox View Post
Looks like a Norvel, 1cc, pre-revlite. These are very good engines
I was told it could be a .046 size, how close does that come to a 1cc size?
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Old 01-07-2014, 12:16 PM
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They came/come in two sizes, the .049 and .061, the way to see the difference is the marking on the case i.e. 1.0 for the 1cc.
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Old 01-07-2014, 01:14 PM
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Quote:
Originally Posted by Mr Cox View Post
They came/come in two sizes, the .049 and .061, the way to see the difference is the marking on the case i.e. 1.0 for the 1cc.
It is written on the back of the motor in permanent ink "1.0 PY"

Out of curiousity, how much more power does the .061 have?
And which would work better in a plane with a 35 inch wingspan that has a fully sheeted 1/32" skin fuselage?

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Old 01-07-2014, 01:49 PM
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That will be the 1.0cc engine then. On some engines the permanent writing is on the side of the case.

The weights of the two engines are the same, so if you are not doing dedicated .049 racing, then you are much better off with the .061 that you have. These also throttle well so the .061 is more useful.
From memory the .049 will spin a 5x3 prop around 20000rpm while the 0.061 will spin the same prop at around 23000rpm. These values are with 10% nitro and 20% all castor oil (recommended as these are plain bearing engines).

Depending on the plane, a 6x3 prop is about the largest prop they can handle, they really perform their best around +20krpm and for most cases I use a 5x4 (or the APC 5.7x3) prop on the .061 engine.
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Old 01-07-2014, 02:13 PM
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Quote:
Originally Posted by Mr Cox View Post
The weights of the two engines are the same, so if you are not doing dedicated .049 racing, then you are much better off with the .061 that you have. These also throttle well so the .061 is more useful.
Apparently it is the .049 I have. I was thinking if the .061 would be better I could try to locate one.

Quote:
Originally Posted by Mr Cox View Post
Depending on the plane, a 6x3 prop is about the largest prop they can handle, they really perform their best around +20krpm and for most cases I use a 5x4 (or the APC 5.7x3) prop on the .061 engine.
It will be a scratch built Live Wire Jr Champ. Wingspan of 35", fuselage length 25", bare model weight as per plans is 8oz, with .049 rc equipment is 18-24oz.

The plans call for a 1/16" sheeting for the full fuselage, and 1/16" sheeting for the wing center.
But I would like to strengthen that by using 1/32" instead.
So if I want to change the thickness I would need to use a .061 which I would need to look for.
If I want to use the .049 I have I need to build as per plans with the 1/16" sheeting. Correct???
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Old 01-07-2014, 02:48 PM
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Why do you think that you have the .049?

The case clearly says 1.0 as in 1.0cc which is equal to .061 cu inch.
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Old 01-07-2014, 04:13 PM
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I stand corrected.
If the 1.0cc equals .061, what cc is the .049? And does the PY stand for anything?


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Old 01-07-2014, 04:24 PM
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Quote:
Originally Posted by Mr Cox View Post
Why do you think that you have the .049?

The case clearly says 1.0 as in 1.0cc which is equal to .061 cu inch.
It is, indeed, an .061 . The casting indicates a 1cc displacement as does the writing on the engine (many times the writing would be on the bottom of the case below the mounting lugs). A .049 is indicated by a 0.8 displacement.

The engine is an early model AAN design --- this is indicated by notched fins on the cylinder. The indicator that it is an early AAN is the glued in carb body. Later carbs were retained with a thru-bolt.

It's possible that it is the higher performance AME, but not likely. While looking into the exhaust port, if you can count 5 round intake ports (two of the ports are located at the front and back of the cylinder), then it is a lower performance model; if you can count 3 large oblong ports, it is the higher performance model.

If you keep your model light, it will fly nicely with this engine. The Champ was designed to fly "on the wing" and does not need a powerhouse to be a good performer.

Last edited by Andrew; 01-07-2014 at 04:26 PM.
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Old 01-07-2014, 04:33 PM
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Quote:
Originally Posted by Andrew View Post
If you keep your model light, it will fly nicely with this engine. The Champ was designed to fly "on the wing" and does not need a powerhouse to be a good performer.
The Jr Champ plans indicate that the plane is made for a .049, with 1oz tank, and 9 gram servos. Thank you for all your help.
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Old 01-07-2014, 04:44 PM
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This ad states the Norvel .049 is 1.0 cc. Is that a mistake?
http://www.ebay.co.uk/itm/Norvel-AMD...-/111077108534

This ad reads as you stated. The .061 = 1.0 cc
http://www.ebay.com/itm/NIB-NORVEL-0...-/360785133601
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Old 01-07-2014, 04:52 PM
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Just found the answer myself, and you are 100% correct. I found in RCGroups it is stated (in part) . . .
"Earlier engines were marked with ink --- .8 cc is an .049; 1.0 cc is a .061."

I can not thank you enough.
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Old 01-07-2014, 06:05 PM
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Most everything you might want to know is found in the sticky at the top of this forum titled: NORVEL Engine FAQ
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Old 01-08-2014, 03:07 AM
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It is a Norvel. I'm looking at mine as I type this. Mine is a .049 control line version. It doesn't have a carb, just a needle valve. It has AMA-08 on the side. Mine is NIB with box and instructions.
Got it from an Estate sale.
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Old 01-08-2014, 08:30 AM
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1.0 PY is an AME .061, meaning that it is not a Big Mig with milder porting.


The engine is going to be powerful, but it's not going to like 6" props like those needed for a vintage airplane.
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Old 01-08-2014, 09:04 AM
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Quote:
Originally Posted by DeviousDave View Post
1.0 PY is an AME .061, meaning that it is not a Big Mig with milder porting.


The engine is going to be powerful, but it's not going to like 6" props like those needed for a vintage airplane.
What prop would you recommend???
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Old 01-08-2014, 09:52 AM
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My limited experience says the APC 5.7 X 3 for your application.
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Old 01-08-2014, 05:30 PM
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Quote:
Originally Posted by shd3920 View Post
What prop would you recommend???

Like Skaliwag says, the 5.7-3 is probably the best prop for your style of airframe, but the engine needs a 5-3 or similar load to get where it makes best power. It's going to run like a healthy TD .049 with that 5.7-3, so even though it won't be optimal it's going to be a rocketship.
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Old 01-09-2014, 11:46 AM
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If memory serves, the most popular props for other than racing was APC 6x2 or APC 5.7x3.

George
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Old 01-09-2014, 04:13 PM
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I have several of these. It is the second to last version of the AME .061 before the Revlite version. You can tell because of the carb and muffler. On earlier models the carb was rounded and later it was removable. If it were the .049 it would have 0.8 marked on it.

It's a very good little engine. As The others have said, it runs best with an APC 5.7x3 or APC 6x2. If you want to see what it can do in a plane, check out these videos.
AME .061 with an APC 6X2 in an Ultimate




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