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Max-s .25 in a flite streak ARF

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Max-s .25 in a flite streak ARF

Old 12-23-2007, 03:17 AM
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Default Max-s .25 in a flite streak ARF

Hello all, I have been flying a flite streak ARF on 60ft lines with a FP .25 for power and it flys great, no shortage of power.

I just picked up a very nice max-s .25 baffled piston here on RCU for a song. I have another FS ARF in the box and was thinking of using this engine in it.

I am guessing this engine will not be as powerful as the schnurle ported FP I'm currently flying. I have not run the max-s yet, so I'm not sure of its power. I am going to try a APC 9.5X4.5 prop for the first flights.

Will I be safe to fly on the 60ft lines like the FP or should I go with 52ft lines first? I'm kind of a C/L rookie and would not like to put this plane into the dirt on its first flight because of a stupid mistake.

Anyone have any tips or suggestions for running this engine?

Thanks

Mike


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Old 12-23-2007, 03:19 AM
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Default RE: Max-s .25 in a flite streak ARF

Oh boy, those pics came out awful.........

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Old 12-23-2007, 02:42 PM
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Default RE: Max-s .25 in a flite streak ARF

Assuming you are going to use it as-is with the throttle open, it will have a bit less power than the FP. The Max-S was known to be a pretty powerful baffle engine and the Flite Streak was designed to fly with a baffle .19 to .35. That said, give it a try on the 60' lines. If it can't hack it, then decrease the line length.

Make sure the engine is broken in with a few short "heat-cycle" runs if it is new. Since it is iron/steel, you might consider using some castor in the fuel also.

BTW, some guys are flying the ARF Flite Streak with a FP .15.

George
Old 12-23-2007, 06:01 PM
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Default RE: Max-s .25 in a flite streak ARF

Yes, I'm going to pin the throttle wide open on this carb and go for it.

This engine has been run before, but not much from the looks of it. I have a case of fox "Dukes" fuel, 10% nitro and I spiked it to 24% ALL castor. This is what I've been running in my C/L engines. I use Omega for my R/C planes.

I would think the .15 FP would be the bare minimum for power. I prefer a little more than that just to be on the safe side, especially being that I am still a rank beginner.

Thanks for the advice George.

Mike
Old 12-23-2007, 08:12 PM
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Default RE: Max-s .25 in a flite streak ARF

I've flown a kit FS (30 years ago) with a Fox .25 from that era on 60' lines. That old Fox was a lot stronger than I ever expected it to be when I bought it.
Old 12-23-2007, 08:44 PM
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Default RE: Max-s .25 in a flite streak ARF

A baffle piston MAX .25 should fly a flite streak without any problem. The MAX .25 is a good 10 years newer in design than the MAX-S .35, and is darn near as powerful as the MAX-S .35. The MAX-S engines (.30, .35) were introduced in 1963, the MAX .20 and .25 didn't come along until the early '70s.

Back when I was at school, I had a friend who had one on a big flying wing (some old Aeroflyte kit, not sure what it was called). His .25 really hauled with a master airscrew 9x4 on it, I don't reckon it was much down in power compared to my MAX-S .35. I don't think the MAX .25 would do a 4-2 break though - better to run it at a nice fast slightly rich 2 stroke.

Incidentally, I am aware of a guy here in Oz who flys a full size flite streak successfully with the the .25s little brother, the MAX .20.

I really love those old baffle piston OS MAXes. They are sweet little engines - easy to start & tune.

cheers,
Colin
Old 12-24-2007, 12:09 AM
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Default RE: Max-s .25 in a flite streak ARF

Thanks, I'll have no worries about the performance of this engine then in the FS ARF.

BTW, I also have a few brand new MAX-S engines in .15, .20, .30 and two .35, all R/C. I also have one slightly used .35 C/L

I pick them up mostly at epay. The C/L versions are the hardest to find and win by far.
Old 12-27-2007, 06:29 AM
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Default RE: Max-s .25 in a flite streak ARF

You and I appear to be suffering from the same addiction :-)

Since getting back into C/L a couple of years ago, I have collected old OS MAX series engines from .10 to .60 inclusive.

1 x .10 FSR-S (one of only two schnuerle ported engines I own, the other is a Norvel)
2 x .15 (one C/L, one converted from R/C)
1 x MAX-III .15 (absolutely beautiful engine!)
1 x .20 (C/L version)
1 x .25 (R/C version, now converted)
2 x MAX-S .30 (one C/L, one NIB R/C, now converted to C/L)
2 x MAX-S .35 (both bought as C/L variants, one was my original 'big' engine bought NIB in 1981, the other 2nd hand from eBay)
1 x MAX .35 "big shaft". Transitional model between MAX-II and MAX-III .35, called a 'combatnik' in the US.
1 x MAX-H .40 (had a hard time getting the venturi for this, now converted and a wonderful engine)
1 x MAX-H .60 (still in R/C configuration - beautiful engine but not sure about using it for C/L)

I'm nearly as bad with Enyas as well. My wife has given up hope :-)

cheers,
Colin

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