H9's Sundowner

[P-51 Dave]

How fast do these go? Anyone clocked them?

[race101]

I have heard that the YS170 moves it along at 150 on straight and level.
The Moki 2.10 and similar around 135
The Saito 180 around 125-130

A DA 170 around 225


I just got my radar gun and will do an actual test on all our race planes, incl the SD with a Moki 2.10.

[teuchter]

imho can’t figure the DZ 170 would spin a prop near as high rpms as the Moki and the Saito
has about ‘O’ chance of pulling the SD anywhere near 130mph, will look forward to your results though.

[ggroyal1117]

Flew my H9 Sundowner F1 with the Evolution 26gx and matching tuned pipe. It flies great, the engine runs great, it just doesn't go real fast. I am getting around 9,000rpm with APC 16x8.
Will this engine improve after break-in? I chose the 26 because of the weight. I found some really good instructions on how to improve performance. Has anyone tried this setup?

http://tech.flygsw.org/evolution26review.htm

Thanks,

George G. Royal

[rcign]

It's completley legal...Smoky Yunick has nothing on our guys...By the rules, the YS can use any prop, any fuel...16 pitch and lots of nitro...
Talk about unintended consequences...

[videocruzer]

i used a garmin 60csx in mine.
146 mph before the stock saito 220 was fully run in.
30% nitro 16x14 and 7500 still rich.
on the 7th gallon on fuel the power really came on strong, but a valve retainer let go before i got a chance to mount the gps again.

YouTube - 08 Victoria Airshow

[dptp9lf]

Videocruzier,
Wow... awesome video.
I know the video showed your equipment but I had a hard time deciphering it.
Can you run that by me again?
Cheers,
Lyle

[teuchter]

Wow that’s some camera/video, loved the pop up and the shadow over the field..

[teuchter]

	Quote: Originally Posted by ggroyal1117
	Flew my H9 Sundowner F1 with the Evolution 26gx and matching tuned pipe. It flies great, the engine runs great, it just doesn't go real fast. I am getting around 9,000rpm with APC 16x8. Will this engine improve after break-in? I chose the 26 because of the weight. I found some really good instructions on how to improve performance. Has anyone tried this setup? http://tech.flygsw.org/evolution26review.htm Thanks, George G. Royal

Respectable rpms nice setup, and good find, interesting link, I have this ignition fitted on an MVVS 35, also with an adjustable magnet mount ring on the front crankcase and is a huuuuge improvement.

[videocruzer]

thanks
i used 2 micro 151 ccd cameras. 1 micro video switcher from hydro cam a 1w 2.4 video tx and a buddy was aiming the ground antenna at the plane. 14db gain patch antenna has a narrow beam pattern only 30 degrees.
as soon as i get some fuel threw the new 220 that they sent me.... the saito 220 does not like to idle under 2500 with a 16" prop, not enough mass. this video has my gps and on screen over lay on my something extra but will be in my sundowner and i have a new mount to bring the vibration down, i hope

YouTube - Something Extra

this video has my new camera in use. its the new 201.
if you could see the raw video is so clear its hard to believe its from a micro cam
check the shadow reflection in the pilots visor in the sundowner vid
this video i used a new 10mw 2.4 video tx
incase u r wondering i get my video break up when there are 2.4 rc systems that are on and close to my ground recording station and the rc 2.4 have shown no problems until they get closer then 10' to the video tx.
BTW

[videocruzer]

	Quote: Originally Posted by teuchter
	Respectable rpms nice setup, and good find, interesting link, I have this ignition fitted on an MVVS 35, also with an adjustable magnet mount ring on the front crankcase and is a huuuuge improvement.

looks like the engine is rated for up to 9500
if you are hitting 9000 on the ground (static) my bet is you are well over 9500 at speed, well past the hp and torque curve.
i have always used the 70% rule as a base line. 60-70% of max rpm(peek HP) is close to your max torque of the engine. this is only a starting point to find the best prop for a given flying style.

[mfuess]

	Quote: Originally Posted by ggroyal1117
	Flew my H9 Sundowner F1 with the Evolution 26gx and matching tuned pipe. It flies great, the engine runs great, it just doesn't go real fast. I am getting around 9,000rpm with APC 16x8. Will this engine improve after break-in? I chose the 26 because of the weight. I found some really good instructions on how to improve performance. Has anyone tried this setup? http://tech.flygsw.org/evolution26review.htm Thanks, George G. Royal

I see you found my site on the Evolution 26GT. While I can easily get over 10,000 RPM out of my 26 GT, it's definitely over-revving. I wouldn't recommend exceeding 9500 RPM. The reason is, the bottom needle bearing on the rod fails. I had this happen 4 times! What happens is the cage cracks and this causes a lot of wear on the backplate. I have successfully pushed a Zenoah G26 to 15,000 RPM without any problems at all. On a 16x8 Mejzlik you will see speeds of around 130/140 MPH. You can use the Evolution 26 tuned pipe and tune it to a Zenoah 26. We do have one Sundowner at our field powered with a stock Zenoah G26 EI. It's OK I suppose... but my Zenoah G20 powered CAP 10 simply smokes that Sundowner.

[Wayne's World]

i currently have a 16x8 apc on m y sundowner with a saito 180,its ok fast but was wondering about a 15x12 apc prop? any ideas? i just want the plane to be as fast as it can be with the saito 180 on it. thanks.

[mfuess]

	Quote: Originally Posted by Bryan185
	i currently have a 16x8 apc on m y sundowner with a saito 180,its ok fast but was wondering about a 15x12 apc prop? any ideas? i just want the plane to be as fast as it can be with the saito 180 on it. thanks.

All you can do is TRY IT. Although you might be better off trying an APC 16x10. Also, your Saito 1.80 will perform excellent running on 30% Nitro Heli Fuel. This will give you about an additional 1000 RPM. The problem with trying a 15x12 prop is, you will give up a lot of dynamic thrust. Especially in the turns and take-off performance.

[race101]

I would suggest you read the manual and find the engines reported optimum HP output at what RPM they suggest and then find the best prop that can turn that RPM with the best Diameter/Pitch set up. Higher RPM's dont mean a faster plane. And like Mike said, keep in mind your you are turning high "G's" and the exit of turns is key in pylon racing. The straights are very long with the SD's in USRA. So it may be benefitial to get a good prop to capture 1600' long straights and suffer a bit in the corners. Dont waste to much time turning, but dont give up speed in those long straights.

Tach it on ground and verify what yields you the best manufacturers RPM recomendations. Then simulate a race at 6 laps and see what gives you the best over all times. Get a radar gun or a telemetry system and use the data from that to see what prop produces the best times. Then report it so the rest of us dont have to spend the time and money


Racing requires time and money and it yields fruit worth both.
If this isnt an option, buy a bunch of props come to Ohio in June and see what everybody else is using and go from there.

Though i believe the front runners are using Moki's. Yes the YS170 is good, but didnt win in the desert last year. This year will be interesting to see what has been discovered.