aspeed

Did you get the XLS, or is it someone else's? I have been getting a bit better than that with no pipe. Maybe the pipe is too long/short. I made a head that really perked it up. I used the MA 7-5" prop. at over 20,000. Either head is hard on plugs. I had been thinking of getting/making a header and pipe for mine, but heard they are weak cranks.

Pond Skipper

Hi Alan,
Yes all these are mine just breaking them in and with some run ups for base line reads.They all need more break in time. Since it's cold out and wet today was a good day for some research and fun with some engine that needed running up. I don't have a pressure line tap yet and had to cover up the exhaust
with rolled up towel exhaust to reduce noise using two hand towels and 1 full size towel. It Also helped to capture oil spray. Might be good for a few hundred rpm gain for each test.

A Master Airscrew has a much thinner blade at the hub, more constant cord props with an even leading edge. I dont have a MA 8x5 to compare nor the modified head. What did you do set yours up for a turbo plug?

Do need to trim down the header pipe its too long at 4.25" I have read for the MACS header 3" to 3.5" for rpm in the low 20's. I am still running bit richer than needed due to this being day 1 run ups.

The engine can run with 8x6 props I'm sure it stresses the crank few bad boinks into the dirt could cause trouble along with a heavy or draggy plane. Perhaps high rpm and high G maneuvers could wang the crank over time along with over heating too many times. Typical props 7x 4 or 5 or 6 or 7 and 8x 3 or 4 or 5 or 6 per the manual.

Plane 1
The ASP .12 has had a full break in hence so many prop tests. I plan to build a plane for the V12RR and do flight testinginsuring the servos are getting the job done no glitches with the ASP before bolting on the extra power and risking the GS engine.

Plane 2
Another goal is build a plane for the bigger case / weight of the XLS .15 that can handle the FX 25 at
some point for more speed.

Plane 3
Also need a general size plane to run the OS 26 and Saito 30 4cyl engines.

aspeed

I had to make the turbo plug head from scratch. It was good for 2,500 rpm or so though. Another guy did it and quickly broke the crank. Those combat guys usually like little props though. A larger prop may be fine. I made a bunch of blank heads, and then finished them off separately for each motor. Way over an hour each, and then running, and shimming etc. I think there were over 14 blanks. Made one for the AP .09 and .15, TTiger .15 or .10, which was a useless motor, and LA .15, Norvel .15, LA .25 which made little extra.... The little TTiger .07 head worked well in 2 out of three motors.

Pond Skipper

2.5k is a great performance gain Alan, perhaps increased compression in conjunction with the additional rpm
may have stressed the crank, that and flying combat is rough on the engines. I figure if I prop around the max
recommendations from the manuals then unload in the air should be safe enough using the pipe.

aspeed

You should be OK under 23,000 rpm. At least the motors are cheap. Kind of hard to find lately. The blue head .15 and .25 are the worlds best kept secret. I think the article that I read about the guy that broke his crank had the crankpin shear off on the test flight. Often that is because the rod to crankpin clearance is too tight, and it siezes, which shears it off. The clearance seems too big sometimes, and that could be bad too, so it is a crapshoot. I think .002" to .003" is where you want to be. .003" would seem pretty sloppy.

Pond Skipper

I have been quite pleased with the ASP .12 shows good promise as it was originally made for cars.
Curious what's under the hood to help it make the rpm required for cars, I wanted to look at the sleeve.
To my surprised they have the 3 transfer ports open from the ground up. This is the only engine on
hand cut through all the way seems like a simple solution for big gulps of air and fuel.

aspeed

The .09 and .15 are the same design, but the .09 does not get milled right through. The Fora .049 is similar to the AP.09, but the bottom of the cut is curved somehow. The .09 sleeve is shown here beside the .15 motor which has the finned head, the .09 is a smaller dia. and has no fins or anodizing. The .15 is really just a .135. They both responded fairly well to a turbo head, but not as much as the blue head one. The LA .15 did not respond very well compared to these making me think that OS spends more time developing their motors.

Pond Skipper

The new micro size video cam came in all up weight 10.4g has a lithium battery and requires a micro SD card.
I will try a 1G card and see what 2MP 640 x 480 30fps will use up duration wise then decide on the right card for the
job I will need enough vid time to test out 2 to 3 props is all on any given outing. 10.4g with SD card mounted.
I have done a brief test at home works fine and sound is good. Will post a vid with in flight rpm data next day
at the field. This one's size and weight is low enough to use on a TD .010 size plane if desired.
On the box mine says Y2000 17.50 shipped.





Here is a vid of one similar:
https://www.youtube.com/watch?v=CgtTg62GDfs


for 9 bucks more you get

• Y3000 Mini Video Camera 8MP
• Video resolution: 1280 X 720@30fps.
• Picture mode: JPG.
• Picture resolution: 3264 X 2448.

http://www.ebay.com/itm/Y3000-Mini-V...sAAOSwNSxVJZ9o

combatpigg

My Feedback: (3)

Hopefully your onboard recorder will show some RPM is gained while flying downwind [and level].
I swear that I've heard rpm sag while flying upwind [and level], so it stands to reason that there would be some "unsagging" when you have the wind at your back.

aspeed

Ya, I wonder as well. I have a theory that downhill makes more difference than the wind. When flying control line on a very windy day I have noticed that you walk slower and faster. You can see the plane go much slower and then speed up. Naturally the lines curve in when slow, and it wants to go slack, so there are other elements to change results. The revs sound the same pretty much. The doppler effect is not noticeable from inside the circle. I noticed a Polaroid cube camera that looks interesting as well. I'll wait for Pond Skippers results anyway. It is getting too cold to fly here.