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Search: Posts Made By: OldFart1
Showing results 1 to 25 of 118
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Forum: Gas Engines
03-29-2010, 04:04 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

FINALLY had a chance to put a tach on my RCGF 26cc (P-47D)

Best RPM is 7800, with an APC 16x10
Forum: Gas Engines
10-19-2009, 03:56 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Finally got a chance to peak the 26cc. Got a best of 7800 RPM with the 16x10 APC
Forum: Gas Engines
08-21-2009, 12:03 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I'm not going to get 165 mph out of my 1/7 P-47D either, but I'm not willing to settle for the "1/7th rule 62 mph either - looks silly at that speed. My F6F Hellcat is up around 120, looks much...
Forum: Gas Engines
08-21-2009, 11:39 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Whichever one is the one used in Wind Tunnel tests. If you google "froude number wind tunnel" you'll have reading material for lunchtime :)
Forum: Gas Engines
08-21-2009, 10:41 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

eddp goes in to the basics here:
http://www.rcgroups.com/forums/showthread.php?t=5221

Here's a link to a chart:
http://www.mnbigbirds.com/ScaleFactorsPage.htm

1/7 I know by heart - .378...
Forum: Gas Engines
08-20-2009, 04:31 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

A lot of it depends on which "camp" you're in for "scale speed". Some folks just divide the speed of the "real thing" by the scale factor - fine if you want a warbird that flies like a Slow Stick
...
Forum: Gas Engines
08-19-2009, 02:12 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Shane - that may be part of my problem. I'm flying the WM 1/7 scale P-47 (IIRC you were on that thread), so I'm dragging around another 5" of wing compared to your H9 P-47, plus (2) retract servos,...
Forum: Gas Engines
08-19-2009, 12:41 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I'm a fellow Scot , I hear you!

It may get better as I get more fuel through her. Right now, the best speed I've found with the APC 16x10. My buddy has the identical plane/motor with the 16x8,...
Forum: Gas Engines
08-19-2009, 12:31 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

_sigh_, I see where you're going....

YES, the RCGF 26 is less expensive! (and mine didn't come with stand-off's, moot point). But I'd have been a bit happier with it if it was equal to a 120...
Forum: Gas Engines
08-19-2009, 12:21 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

About $350
Forum: Gas Engines
08-19-2009, 11:40 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

It would all depend on your definition of "pulls really well". In 3D, it may "pull" just fine. On a warbird, I can tell you that the RCGF 26cc compared to the Evo 26cc is night and day different -...
Forum: Gas Engines
08-12-2009, 11:10 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Considering pretty much everything ModelTech offers comes in substantially heavier than advertised, I'd have a 45cc waiting after the maiden :)
Forum: Gas Engines
07-15-2009, 11:03 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I haven't switched from the "lawnboy" type oil yet, but as far as speed (not thrust) the 16x10 APC is the fastest prop I've run on my 26cc (1/7 P-47). The 18x6 was both a dog and a fuel hog - the...
Forum: Gas Engines
06-09-2009, 02:55 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I'd take a 16x8 and 16x10 to the field, see which one you like. A lot of it will depend on flying style - are you looking for 3D or Sport performance? I have my RCGF 26 in a 1/7 scale P-47D, the...
Forum: Gas Engines
05-14-2009, 03:09 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I'll fiddle with it. Fortunately, there's another buddy at the field with the same plane and engine - so we can double up on the comparative testing.
Forum: Gas Engines
05-14-2009, 02:46 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Karol, I tried the 18x6W (Henry's recommendation), 16x8 and 16x10 - the 16x10 was by far the fastest of the lot. I'll probably A/B between the 16x10 and 16x8 next trip out and reverify - plus...
Forum: Gas Engines
05-14-2009, 11:26 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Karol, I'm currently running an APC 16x10 on the 26cc

Chad - the YS120 is running less prop (loves the 16x8 APC), the aircraft (F6F) is about a pound lighter - and the speed difference is night...
Forum: Gas Engines
05-14-2009, 10:50 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I'm waiting to get a few more tanks through the P-47 (and a few more landings!), then I'll experiment with better props. It was advertised as a "1.20/4 stroke" aircraft, and I can tell you that...
Forum: Gas Engines
05-14-2009, 10:44 AM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I hear you there Andy. I have the Nitro (CMP) F6F Hellcat, it's an "OK" bird - but certainly not going to win any prizes for Scale.
Forum: Gas Engines
05-13-2009, 05:29 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Dunno - and Henry's site isn't responding. I guess I could live with a pair of Saito 72's if I had to (have one already - but it's promised to a Twist 40)
Forum: Gas Engines
05-13-2009, 05:07 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Sam, power as in speed or thrust? Speed - I've found the APC 16x10 to be by far the fastest prop on my WM 1/7 P-47 (haven't switched to wood yet)

Speaking of warbirds, could I shoe horn a pair...
Forum: Gas Engines
05-09-2009, 10:31 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

I have a 1/4 scale Cub (H9 Supercub, with a G26). It's worth being good the rest of the year for :)
Forum: Gas Engines
04-29-2009, 03:21 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

Henry originally told me 18x8 also - couldn't get to run anywhere near 7200, my P-47 was dog slow (and guzzled fuel) with that prop. I'm running a 16x10 now, my buddy Gary runs a 16x8 - I'm quite a...
Forum: Gas Engines
04-14-2009, 04:08 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

What he said :)

And the "thrustiest" prop isn't usually the "fastest" prop!
Forum: Gas Engines
04-14-2009, 03:34 PM
Replies: 6,847
Views: 920,046
Posted By OldFart1

RE: RCGF Engines

At least 14 oz. My P-47's not completely broken in, but I get about 14 minutes or so on the 26cc/16x10. IIRC, I have either a 14 or 16 oz tank.

...
Showing results 1 to 25 of 118
 
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