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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: Chris McMillin on August 07, 2012, 10:03:26 PM

Title: Which of these 1/2A engines is better stock?
Post by: 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...

Title: Re: Which of these 1/2A engines is better stock?
Post by: ChrisSarnowski 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

Title: Re: Which of these 1/2A engines is better stock?
Post by: Joey Mathison 9806 on August 10, 2012, 09:17:07 PM

cs would be the make of the proto record holder.

Title: Re: Which of these 1/2A engines is better stock?
Post by: ChrisSarnowski on August 11, 2012, 04:49:38 AM

Was just going by what I had read....

-Chris

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

Title: Re: Which of these 1/2A engines is better stock?
Post by: Joey Mathison 9806 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.

Title: Re: Which of these 1/2A engines is better stock?
Post by: PaulGibeault 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...

Title: Re: Which of these 1/2A engines is better stock?
Post by: john e. holliday 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. 

Title: Re: Which of these 1/2A engines is better stock?
Post by: Chris McMillin on August 15, 2012, 03:10:49 PM

Thanks guys for the usable info.
Chris...

Title: Re: Which of these 1/2A engines is better stock?
Post by: Michael Alurac 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.

Title: Re: Which of these 1/2A engines is better stock?
Post by: Bill Hughes 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

Title: Re: Which of these 1/2A engines is better stock?
Post by: Michael Alurac 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.

Title: Re: Which of these 1/2A engines is better stock?
Post by: Bill Hughes on November 05, 2012, 04:33:06 AM

Thanks for the information. I will send him off an email right now.
Bill Hughes

Title: Re: Which of these 1/2A engines is better stock?
Post by: ALBERTO CABALLERO 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