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Author Topic: Which of these 1/2A engines is better stock?  (Read 1499 times)

Offline Chris McMillin

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Which of these 1/2A engines is better stock?
« on: August 07, 2012, 10:03:26 PM »
I'm no engine guy but thought a little Speed would be fun, which of the .049's is a better runner for Proto, Fora or Profi? They are in stock here,
hobbyclub.com

Thanks, Chris...
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ChrisSarnowski

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Re: Which of these 1/2A engines is better stock?
« Reply #1 on: August 10, 2012, 08:25:39 PM »
I just picked up the Fora 049 a week ago, and hope to start running it this weekend.

Profi's aren't in stock yet. Looks like a week or so out.

Doug Galbreath has a modified Picco engine that holds the 1/2 proto record similar pricing as others. Doug does a bunch of work to make it legal for 1/2 proto.

http://www.flyinglines.org/picco.proto.html

-Chris
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Offline Joey Mathison 9806

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Re: Which of these 1/2A engines is better stock?
« Reply #2 on: August 10, 2012, 09:17:07 PM »
cs would be the make of the proto record holder.
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200 mph man ama#9806 joey mathison

ChrisSarnowski

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Re: Which of these 1/2A engines is better stock?
« Reply #3 on: August 11, 2012, 04:49:38 AM »
Was just going by what I had read....

-Chris

http://www.the-printer.net/DookCat.html

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Offline Joey Mathison 9806

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Re: Which of these 1/2A engines is better stock?
« Reply #4 on: August 11, 2012, 10:40:07 AM »
108.78 mph on 4/3/05 by Jerry Rocha in Merced CA i belive the fastest he has gone with the p-0 is 107 witch is still way faster than the rest of whats left of the pack.
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Offline PaulGibeault

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Re: Which of these 1/2A engines is better stock?
« Reply #5 on: August 15, 2012, 05:28:21 AM »
So far in the N.W....I've seen a few (most likely stock) Profi's & results have been around
80-85 mph proto.
The engine itself appears to need to rev very high. (perhaps 34-36,000 rpm) The biggest
setback to higher model speeds is the prop.  Props used so far (& I don't know the sizes)
rev like crazy but don't seem to go anywhere (faster than ~85mph).
But...for a stock engine they seem to run well enough...

I have yet to hear or see a Fora in 1/2A Protospeed. Maybe someone else has??

BTW, the C.S., G.Z, & Picco P-5 are not faster than this in stock condition. With proper
rework some can go a fair bit faster, but the question was "in stock condition".

Cheers, Paul


Quote from: Chris McMillin on August 07, 2012, 10:03:26 PM
I'm no engine guy but thought a little Speed would be fun, which of the .049's is a better runner for Proto, Fora or Profi? They are in stock here,
hobbyclub.com

Thanks, Chris...
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Offline john e. holliday

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Re: Which of these 1/2A engines is better stock?
« Reply #6 on: August 15, 2012, 08:37:33 AM »
This is where experimenting comes into play with props.  Yes someone say use so & so prop.   But, I think in the old day we started with a high pitch prop and started reducing diameter until speed fell off.  Then we cut a new prop with the previous diameter to see if speed came back.  I mean 9-14 props on an old McCoy Redhead .60.   I have some old wood props in the shop with even higher  pitch.  The pitch on a prop is like gears in a car.   The lower the pitch the faster it accelerates, but no top speed.   The higher the pitch the longer it takes to get to top speed. 
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John E. "DOC" Holliday
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Offline Chris McMillin

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Re: Which of these 1/2A engines is better stock?
« Reply #7 on: August 15, 2012, 03:10:49 PM »
Thanks guys for the usable info.
Chris...
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Offline Michael Alurac

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Re: Which of these 1/2A engines is better stock?
« Reply #8 on: November 01, 2012, 11:26:53 PM »
Giving the Doug Galbreath prepped Picco P-Zero a go in my 1/2 A Proto Bipe - The Dale Kirn Torquette. Break-in run at 29,500 with a 4.75 x 4 prop on suction as our club www.KOTRC.org Dale Kirn Memorial fun-fly event requires. Will report back on the P-Zeros performance as flight testing begins.

Rules are:
Stock Torquette per Dale's article
Maximum .061 displacement
Suction feed only
Lines and fuel to be provided by the club (30% Nitro, 42ft x .012in lines with handle)
Kits available from Tom Collier tcstunts@verizon.net for $20.
« Last Edit: November 09, 2012, 09:43:16 PM by Michael Alurac »
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Offline Bill Hughes

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Re: Which of these 1/2A engines is better stock?
« Reply #9 on: November 04, 2012, 01:55:17 PM »
How can I purchase one of those biplane proto kits? I do not know Tom Collier.
Bill Hughes
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Offline Michael Alurac

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Re: Which of these 1/2A engines is better stock?
« Reply #10 on: November 04, 2012, 08:20:23 PM »
Hi Bill, Tom's email is tcstunts@verizon.net. This is a short kit, you will need to make your own engine mounts & LG.
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Offline Bill Hughes

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Re: Which of these 1/2A engines is better stock?
« Reply #11 on: November 05, 2012, 04:33:06 AM »
Thanks for the information. I will send him off an email right now.
Bill Hughes
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Offline ALBERTO CABALLERO

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Re: Which of these 1/2A engines is better stock?
« Reply #12 on: November 07, 2012, 12:41:19 PM »
We have a new 1/2A engine FIRE PROFI .049 engine, Is ready for any top competition, and don't need any rework.

Alberto 
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