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26cc gas prop size

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Old 06-29-2008, 01:32 PM
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Penuts
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Default 26cc gas prop size

I have a Extra 260 from cermark with a 26 SPE, I'm turning around 8 to 8200 with a 16/6 and
77 to 79 with a 16/8, I was just wondering which one would be better,I'm new to gas and i can use all the help i can get. Or should i use a different prop?
Any help would be appreciated.

Thank you
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Old 06-29-2008, 03:11 PM
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mikeboyd
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Default RE: 26cc gas prop size

I think 8200 is a little fast for a gas engine, I have run both an Evolution Wood 18X6 and APC 18 X 6W on My XY 26, and both seem to turn between 6800 to 7200. I am flying it on a GB Wild Stick and it is a hoot to fly. Seems to be about the same as a 120 4S, as far as vertical. I tried both a 16X8 and 16X10, but seemed to get better performance from the 18 inch props. Hope this helps.
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Old 06-29-2008, 09:25 PM
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skip1320
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Default RE: 26cc gas prop size

8200 would be good with 16/8 apc might get more once broken in,around 13lbs thrust,how much does the plane weight all up dry,good luck!
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Old 06-30-2008, 12:23 AM
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Default RE: 26cc gas prop size

The plane weighs out ready to fly at 9pounds 12 oz. less fuel.
I thought that was a little heavy.I added no weight to it at all just the batterys and engine.
Moved the batterys to the rear of the plane to get the correct cg and thats it.With the light 2.4 receiver i thought it would be lighter than that.The only thing i did was to add some ca and some
triangler stock and epoxy around the fire wall.

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Old 06-30-2008, 06:18 AM
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Default RE: 26cc gas prop size

The plane i am flying now weights 9.12,little bit more w/area though,if you get 8200 w16/8 you will be fine,not balistic buy any means but fun,good luck!
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Old 06-30-2008, 07:17 AM
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Default RE: 26cc gas prop size

I have a G26 turning a APC 18-6W @ 7800-7900 rpm. That is a good performer, but a even better performing prop is a Zinger Pro 18-6 wood. It tachs out about the same on the ground as the APC but it seems to pull a little harder once in the air. Also it is quite a bit lighter.

I have this engine on a Ultra Stick Lite. It is a great combination!!! I have no idea what the weight of the plane is though.

Ryan
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Old 06-30-2008, 09:53 AM
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Default RE: 26cc gas prop size

an APC 17x6.
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Old 06-30-2008, 01:37 PM
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Default RE: 26cc gas prop size

Mejzlik 18X6 Carbon - Zenoah G26 w/better exhaust, WT540, and added CH EI - 9200-9400. I'm measuring over 20lbs thrust.

Edited to add: The Zenoah's max torque is at 9000 and the max HP is at 12,000 so it needs a prop that lets it spin a bit.
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Old 06-30-2008, 11:21 PM
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Default RE: 26cc gas prop size

Thanks guys,
As of right now im turning 8000 with a 16/6 but i will try a 17 as soon as i can get one,It flys great for me but it really needs more power. I really dont care for the spe engine just does not put out the power like they claim it does.

Here's a pic of the plane anyways.
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Old 07-01-2008, 01:04 PM
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Default RE: 26cc gas prop size


ORIGINAL: Penuts

Thanks guys,
As of right now im turning 8000 with a 16/6 but i will try a 17 as soon as i can get one,It flys great for me but it really needs more power. I really dont care for the spe engine just does not put out the power like they claim it does.

Here's a pic of the plane anyways.
Most gas engines take awhile before they break in and start making real power. Don't loose heart, just burn a bunch of gas with the correct oils in it, and you will be rewarded.

DA recommends that the first couple of gallons you use petrol based lubes such as Lawnboy ashless mixed around 32:1. This will throw allot of black soot on your plane, but helps seat the rings to the liner and loosen things up a bit. Once you notice that the engine is coming around and putting out more power after the first two to three gallons, then you can switch to Amsoil Sabre 100:1. In the hot summer heat, here in Texas, I usually mix the Sabre oil to about 65:1 to get the extra lubrication in cowled engines. Once you switch, you will notice a pronounced difference in performance, but don't rush the process.

If you start with Amsoil, you may never seat the rings, since it is such a superior lubricant, so don't try to break the engine in with it.

I had to run nearly four gallons of Lawnboy "syrup" through my Fuji 64 before it started to break in enough to switch to Amsoil, but once I mad the switch, everyone remarked at how much power the engine gained.

Hang in there, gas engine do need allot of correct break-in, but they don't cost an arm and leg to fly eithers.

Happy Landings,
Mike Boyd
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Old 07-02-2008, 11:58 AM
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Default RE: 26cc gas prop size

Excellent advice Mike has there. I use Pennzoil Two Stroke Air Cooled oil for break in and Redline Two Stroke Racing or Motul 800 after break in.
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