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Old 10-22-2006, 08:39 AM   #11
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Re:glow or gas

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Have you checked out popcan's string under 'Fixed Wing' where he put the new Zenoah g20EI in his Funtana X100? Seems to work OK. That airframe is 69.5" WS and 1108 Sq.In. area, at 73" WS you should have more wing area on the Giles - I tried to find out for sure on Great Planes site, but the Giles is discontinued & there are no specs. The all up weight, w/muffler and ign., of the little Zenoah is listed as 41oz, only 10oz more than the Saito 1.50 - prop recommendation is smaller. So it's a close call IMHO, it probably would be weak for 3D, but a good combo for sane aerobatic flight.
Robin Boomsma
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Hub City Radio Control Club
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Old 10-22-2006, 09:01 AM   #12
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OK I had forgoten about those new BME.90 gassers.

RobC has one for sale and he said it would fly the MAXXAIR 68" Velox fine for IMAC but not so good for 3D. I checked the specs and the Velox has only 980 sqin of WA so I would think this engine would be a good choice for the Giles.

Rob states 25 minute runs on 8 oz of gas so that nice small tank will help keep allup weight down becauswe if you used the Saito you would need at least 16oz to do 15 minutes on glow I suspect.

Good price from Rob right now to, about same as the Saito 100. Go for it.

Was you've had gas... you never go back!
Jim Daly
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Old 10-22-2006, 09:20 AM   #13
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I sold my GP Giles 202 to a fellow in my club. I was flying a YS140 in it and when i sold it to my friend he decided to go gas with it/ he put the Zenoa G23 in it. I was a little worried about haveing enough power but was plesantly serprized lots of power for IMAC and that was with the heave Flywheel and magneto sill on the motor.
What do you mean , I can land upside down
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Old 10-22-2006, 10:42 AM   #14
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Gas can be very successfully used under 80" but only if the airframe is built for it. Ultra-RC makes a very nice Giles that works very well with gassers. Large wing, super light = perfect. However, say a Funtana90 or something, I would stay away with gas and stick with glow. On your particular example I wouldn't consider gas.
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Old 10-22-2006, 10:53 AM   #15
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Flying a Sig Cap 231EX with a Q42 on batt ign. 72 in. WS. Flies decent.
Tried for my kamikazi pilots licence. Flunked the test.
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Old 10-22-2006, 10:59 AM   #16
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Originally Posted by Rob
I sold my GP Giles 202 to a fellow in my club. I was flying a YS140 in it and when i sold it to my friend he decided to go gas with it/ he put the Zenoa G23 in it. I was a little worried about haveing enough power but was plesantly serprized lots of power for IMAC and that was with the heave Flywheel and magneto sill on the motor.
I've read on some other sites where guys put Zenoah G26's on planes such as the Giles in question (ie: 1/4 scale caps, extras, etc) and they all said it was good power for IMAC type flying but not for 3D. It will work, the only problem is that you can not slow it down as much for landings. If you are looking for a 3D plane, a gas engine in this size plane would not work in my opinion.
Dave V.
Burlington Radio Control Modelers
Team Skycraft
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Old 10-22-2006, 12:01 PM   #17
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LOL, says the guy with a turbine!
Thank god Kerosene is cheaper than glow too hey wayne!
Yeah but when you land up wiping 3/4 of the glow fuel off the plane after every flight, you have to draw the line somewhere...

The sooner you fall behind, the more time you will have to catch up.
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Old 10-22-2006, 01:56 PM   #18
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I had a Maxair Velox with an Evolution 26cc gas/fully tuned pipe. The power was fantastic. The weight killed it. At first, I had a YS110 and it was a great combo...somewhat costly to run and messy but the power/wingloading was where it was supposed to be. I decided to experiment with the Evolution 26cc and I'm glad I did, but the airframe was just too small to perform the way it should have with the gas motor. That being said, I am very critical of my airframes as I would consider myself to be a very performance hungry what works for somebody else might not work for me. IMHO the 25cc gasers would be great on something like a Cessna, Citabria, Decathlon, Cub, or an Ultra Stick "lite" 120 (or something along that line) but not on a high performance IMAC style aerobat.

If your looking for top notch performance from a 70-75 inch ish airframe with a gas motor, it will be very hard to do with what is on the market right now. I have flown a few 100cc birds and a few 50cc birds so I have an idea of how a decent combo should perform.

Also i'm gonna go against the grain here and say that IMHO, it takes more power to do a "good" IMAC sequence than it does to 3D. With 3D, your anywheres from 1/3 throttle to 3/4 throttle (of course, different setups will vary) but with a good IMAC sequence, it definately helps if you have lots of power for the uplines....i.e so it doesn't get too out of shape after a snap or a few rolls. I am by no means an accomplished IMAC pilot..maybe some of you guys who compete in IMAC could chime in?

If you don't mind sacrificing performance for some added wieght, then go for it. If you are content doing rolls, small loops and intermediate aerobatics, then a good 25cc ish motor should make you happy.
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Old 10-22-2006, 05:23 PM   #19
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Smaller Planes on Gas

Yup, we've been flying Goldberg Sukhoi size (72") planes very successfully on clunkers (Quadras/US Engines) for a long time. They do well for sport flying, not so sure about comp.

Just about any round engine scale model will handle the gasser and do without the lead! Tex.
Tex Gehman, Winnipeg
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