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Author Topic: .29 or .35?  (Read 1272 times)

Offline John Stiles

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.29 or .35?
« on: June 06, 2013, 06:00:32 AM »
I was once told how that a McCoy type 21 .29 was more powerful than the McCoy type 21 .35. Turns out they were correct. Now I've been told by at least a couple of enya afficianado's that the same is true with the Enya 5224 engines. Bearing in mind that they share basic parts, and either one fits my RM Imperial application; which one is gonna perform for me? I'm building as light as I can; and have access to both engines...several venturi sizes. Looking for the straight skinny. H^^
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John Stiles             Tulip, Ar.

Offline Paul Smith

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Re: .29 or .35?
« Reply #1 on: June 06, 2013, 06:08:53 AM »
I can't speak about this particular product.  However, I will say this about 35's downsized to 29.

There is some chance that they happened to hit on a better bore/stroke ratio on the 29 and it actually makes up for the reduced displacement.

Generally, 35's were the mainstream engine and 29's were a special low production run aimed at the old AMA Class B events.  In (my) theory, the short term special run of 29's got better quality control than the gigantic mass run of 35's.  I've run OS Max III. Enya, and Fuji 29's with good success comoared to 35's. 

If quality is equal, bigger is better, but quality isn't always equal.
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Offline Steve Thomas

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Re: .29 or .35?
« Reply #2 on: June 06, 2013, 07:44:31 AM »
I don't know about the other manufacturers, but in the case of Enya the .29 was intended for racing and the .35 for stunt. I believe both were rated at the same power output. 
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Offline Bill Little

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Re: .29 or .35?
« Reply #3 on: June 06, 2013, 10:56:38 AM »
Brother John,

For your purposes I would use the Enya .35.

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Offline dennis lipsett

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Re: .29 or .35?
« Reply #4 on: June 06, 2013, 11:16:54 AM »
Bill,

He has an Enya 29. Believe me it has more than enough to fly the model. After all they did use Fox 35's on them.

Dennis
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Offline Steve Helmick

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Re: .29 or .35?
« Reply #5 on: June 06, 2013, 05:47:37 PM »
For your purposes, I'd suggest the .45!~ The RMI is a big aeroplane, and more is always better than less, when it comes to torque and ability to swing a big prop.  H^^ Steve
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Offline John Stiles

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Re: .29 or .35?
« Reply #6 on: June 09, 2013, 06:06:48 AM »
Quote from: Steve Helmick on June 06, 2013, 05:47:37 PM
For your purposes, I'd suggest the .45!~ The RMI is a big aeroplane, and more is always better than less, when it comes to torque and ability to swing a big prop.  H^^ Steve
Believe me, I have reflected on that many hours as the build progresses. But like a dummy, I built the plane around the Enya .29. My first Imperial was a daunting experience, when I used a K&B .40 to create a rocket that never even rolled out on take-off...just jumped off the ground, made a couple of laps and disappeared into history on that fateful day. I found an Enya .35, but it turned out to have very little compression or I'd have done what Bill little suggested. Looks like I'm stuck now with the .29 unless I do surgery to the engine compartment.
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John Stiles             Tulip, Ar.

Offline John Stiles

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Re: .29 or .35?
« Reply #7 on: June 09, 2013, 06:09:51 AM »
Quote from: dennis lipsett on June 06, 2013, 11:16:54 AM
Bill,

He has an Enya 29. Believe me it has more than enough to fly the model. After all they did use Fox 35's on them.

Dennis
The box stated for .35 or .29 engines ;)
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John Stiles             Tulip, Ar.

Offline John Stiles

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Re: .29 or .35?
« Reply #8 on: June 09, 2013, 06:12:45 AM »
Quote from: Paul Smith on June 06, 2013, 06:08:53 AM
I can't speak about this particular product.  However, I will say this about 35's downsized to 29.

There is some chance that they happened to hit on a better bore/stroke ratio on the 29 and it actually makes up for the reduced displacement.

Generally, 35's were the mainstream engine and 29's were a special low production run aimed at the old AMA Class B events.  In (my) theory, the short term special run of 29's got better quality control than the gigantic mass run of 35's.  I've run OS Max III. Enya, and Fuji 29's with good success comoared to 35's. 

If quality is equal, bigger is better, but quality isn't always equal.
Lets hope this is the bottom line, in my case I have 2 virtually new .29s so if one is a dog, I have a second chance! ;D
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John Stiles             Tulip, Ar.

Offline Howard Rush

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Re: .29 or .35?
« Reply #9 on: June 09, 2013, 01:58:14 PM »
I'm no help, but this reminds me of buying my first big engine.  I had my eye on a Berkeley Navion kit.  The box listed the applicable engine ranges for free flight, RC, and CL.  .29 was common to all three, so I went off to the hobby shop with my lawnmowing money and got an OK .29, an machine whose only use was converting methanol to noise.

It reminds me of yet another .29 historical issue. Hey, Paul, who was the kid from Detroit who used a Supertigre .29 to win Jr. combat at the 1964 Nats? 
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Offline Balsa Butcher

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Re: .29 or .35?
« Reply #10 on: June 09, 2013, 02:13:39 PM »
I ran an Enya 29 (square venturi) in an All-American OTS for awhile. Replaced it with an Enya 35 5224. No difference in power but the 29 ran better. I think you will do fine with that choice.
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