This is an interesting combo. Please let us know how it goes.

I have now run the DL through 8 gallons of gas and it's performing very well. It starts easy has tones of power and it has never flamed out.

I switched to Red Line Two Stroke Racing Synthetic Oil, after 5 gallons. On the bottle it says that you can mix it between 16:1 to 100:1 I’m mixing it at 80:1

Is anybody else using this oil ?? How is the engine holding up??

Earlier today I switched to a Xoar 23x8 sword prop as well.

The Xoar 22x8 was turning 7200 and pulling 25 lbs of thrust @ 1200 ASL and 74 F
The Xoar 23x8 is turning 6700 and pulling 26¼ lbs of thrust @ 1200 ASL and 74 F

Is 6700 too low of an RPM for this engine ??

My RC Guys Pitts with the DL50 and 22x8 Xoar combo is a little bit faster, but the 23x8 has way better up lines. With the 22x8 the DL50 accelerates a bit faster as well. Another thing I notice is that what I thought to be engine exhaust noise with the 22x8 turned out to be prop noise. The plane is noticeably more quite with the 23x8.

All in all I like the 23x8 better on the DL50 and hoping that 6700 is OK for an RPM.

Bound_4_Hell
You can never have enough power, as you can always throttle back.

Does anyone make a prop jig for drilling the props for the DL 50.

PSP makes a good one. Any drill guide made for a DA 50 will work.

Same as DA 50 jig. Available from all sorts of places. I like the one from PSP Products.

I hopw this isn't a dumb question but what is prop noise?

Rotational velocity at the tips, usually. Depends on prop design, tip shape, thickness, rigidity of blade, etc. Chart of tip speeds on my website, link from main page. As velocity approaches .7 mach (very easy on 23" + props these days) the prop begins turning so fast that the blades' tips remain in turbulent air which begins a process called "cavitation". Cavitation of a prop means it is no longer "pulling" against the air, but just spinning. This creates a bizarre and very loud noise, usually, that some call "ripping".

"Ripping" is actually when a prop is nearly fully-cavitated at the tips because the rpms are such that the tips actually go supersonic, exceeding mach 1 velocity.

Generally, it is not recommended.

But it sounds really cool

Here is a link to a video. About a quarter the way into the movie he does some high speed passes and you can hear the prop ripping.

http://www.youtube.com/watch?v=aAH8BDr33ys

The drill guide for the DL are the same as a DA, we normally have them in stock but are sold out, we do have engines in stock 50cc only. We will have drill guides back in stock in about two weeks.
Tom
Valley View RC

To quote myself, "RIPPING means the tips have entered the TRANSONIC regime, not that they are supersonic. The air also doesn't travel exclusively in a chordwise flow, but also travels spirally outward from the hub to the tip (slightly). The tips of a 28" prop will actually go SUPERSONIC around 8000 rpm.

Beyond this point the propellor airfoil decreases in efficiency by increasing the occurrence of vortical "shedding" at the tip and wake and also the flow separates from the high-pressure surface, causing the shearing of air along the span of the blade, which increases the noise of the prop.


The "P-Tip" and scimitar props attempt to decrease these factors and result in some noise reduction if designed correctly.

I have had my Dl for quite some time about 8 months and never ran it. I fired it up today and ran about 3 tanks or 80 minutes through it, it ran great but vibrates
alot. Is the vibration normal and will it get better? Isure hope so because I have been giving my buddy a hard time with his DA. I am going to run it again tomorrow
and finish the 2 hours then I will tweek it. I am running the lawnboy 32:1 and a menz 22x8 prop. I am getting 7400 so I richened it back to about 6K. The 22x8 menz
doesn't seem to be enough load so I will put a 23x8 on her after I finish the 2 hours. If I can get rid of the vibration this will be one sweet puppy.

Jeff

What is that prop noise when you are hovering and you start sliding down? We all call that ripping because of the sound it makes.

Gas engines tend to vibrate more than most engines. Make sure you ballance your prop, not just the blades but the hub also.

It is a big no no to run the engine rich as much as you are doing, it will carbon up the plug and ring will fast. Tune the high speed needle back to where it was and keep the rpm down for a few tank fulls.

AND - proper leaning of needles can address a LOT of vibration. Mine thumped like a Harley until I leaned the low end. Both the 50 and the 100 seem to like "leaner" needles on the low end than one would think.

Ive got one (DL) setup in the Comp-Arf 2.12 (new version of the 2x2, has slightly more wing area, bigger throws and can tunnel) with an MTW75 can, very good combo and out of site performace. Use it for IMAC. Good combo

Thanks and good info. What is the total dry weight with your setup, and wing area?

My 50 will be here wednesday and it is almost as good as the wait for my little girl to get herewell mabye not that good but i can't wait to mount it up. I have a GP 330 that is lacking just the engine. I can't wait fly this plane. I bought a pitts muffler and have a 23A vess to go o it. The guys at the field fly DA, 3W, BCMA, and Zenoah. And they can't wait to see how this puppy runs. Will give flight reports when i have them.

Got heap pics/info on another thread on F Giants, do a search on FG for Comp Arf 2.12 Extra.

Dry weight is 7.2kg with dual lion batt setup & mtw can. Hitec Digitals Not sure about wing area off top of my head, but is on Comp-Arf website.

But wont go into here, bitoff topic. PM me for links if you want them . Cheers!

Well,it"s time to order my 2nd Dl 50.Last week I"ve ordered my new flagship[sm=wink_smile.gif]
http://www.hangar-9.com/Products/Def...ent=Yak5489%22
I hope this new Yak will love this powermill.Will see.

Georgee

I ran my DL 50 another 40 minutes today leaned it out and it hit over 8k richened it bac to 7440 and tuned the low end. The engine runs great
and has great transition. I pulled the plug it it is a light tan in color. Is anyone else running the Menz props? If so what rpms are you getting?
The engine has smoothed out somewhat. I am checking the balance on the prop again and balancing the new ones.
Can't wait to get her in the air.


Jeff

WHAT kinda snot...err I mean prop are you runnin on that thang. 8k is a little tight... dont yah think? Best I got on mine so fer is 7250 on a Vess 22A.

The menz has too light a load If they make a 23 X 8 that is what you need to run or get a Vess 22B. You need to tune the engine in for optimum performance and that prop just isn't going to get it. I would think the max RPM i would want to see on the ground would be in the range of 7000 to 7300 because it will unload in the air.

I have to disagree I run my DL in the 7700 range on the ground (on a pipe) unloads in the air and runs great, two stroke engines make power through RPM these engines are made to run in the 12-14 thousand RPM range look at any chain saw and check the RPM, I know everone is going to say this is not a chain saw engine, true but all these small engines came from industral roots. Just my .02

Using a JXF 22 X 10 or a 23 X 8 gives you around 7200 RPM's, I do not like to run these engines much more than that. If they are running 7200 on the ground they are turning much more in the air. Just my 2 cents worth.
Tom
Valley View RC