I am putting the 2x8 on next I am aware that the load is not enough, hence the 23x8 I have a freind with the other d engine and with the same prop he is geting 6600 rpm. Funny huh.

Jeff

I am now running the xoar 22x8 on my da-50 and a slim line wrap around muffler i think it is called, i also have the hyde soft mount and turning up 7800 and running really great, my friend is looking into getting the dl-50 and i would also use the hyde mount and the slimline muffler with that as well, i have heard nothing bad at all about the dl-50 and would like to when i can afford it try one myself.

All my (3) DL's are on tuned pipes. Two on KS pipes @720mm from header to baffle and the other on ES composite tuned pipe. GO for the KS, much more durable and not such a 'peaky' response.

Cheers

W

forgot to mention...ES pipe is on a 12" header.

Guys,

I have a DL-50 for my first gasser, a 30% Extra 330L. Still in the assembly stage. THis is a long thread and I tried looking awhile and also tried the Search feature, but did not find an answer to my question...what size tubing (inside diameter) do you use on this engine? Funny how the instructions don't even recommend a size. I know it should be Tygon, but should it be 3/32", 1/8", or 5/32" inside diameter? I see Dubro offers those three sizes of Tygon. Thank you. Jon

Jon,

I'm using the DuBro Tygon, but I can't say for certain which size it is. I use it from a 50' (or 30'???) spool. I have some at work. I'll look and see what the label says and let you know tomorrow (unless somebody else answers you first).

Part of the problem is the way DuBro labels their tubing. 3' rolls are labeled X Large, 3/32", and 1/8". But the bulk rolls they sell are labeled differently; 50' Medium, 30' Large, and 25' 5/32". So you have six different names for, I assume, three different sizes (unless the 3' lengths are different diameters than the bulk rolls - who knows?).

Now that I think of it, I just use the Large that came on a 30' roll, but I'll confirm that tomorrow for you. Hopefully somebody else can answer for sure what you need to use.

Tim

You don't want the 5/32". Too big. Standard 1/8" brass tubing comes with most tanks and the 5/32" wouldn't fit properly. I use the 1/8" on both the DL 50 and the 100; no issues.

Howdy wavy777 I had a look at the KS Pipe site. They list a pipe for 45cc and 60cc, which one are you using?

Hey guys, i was wondering if i could place the ignition battery for my DL50 a few inches behind the rudder servo, it balances the yak perfect. Would there be any interferance with the reciever signal on the 2.4 system?

No.

Guys,

when I advance the throttle after extended down lines (when the throttle was at idle) the engine hesitates and sounds like it's going to quit before it "spools up" again. It always sounds like it's going to quit, but never has - just kinda unnerving.

My needles are set so at full-throttle it runs perfectly and at half-throttle or a little below it burbbles/four-strokes (if that has anything to do with it which I don't think it does).

Any suggestions?

Thanx BOB!!!
with a name like that U must be Italian!!!
me 2 I'm Vito

Tim, nearly always a "throttle up" hesitation is too lean a low needle. It is easy to miss the sweet spot, since the low end affects the high, you can be tweaking away and get the high "perfect", but the low is lean.
My "test" is to leave a fully-warmed up engine at it's sitting-still idle....if it gradually speeds up, the low end is lean, if it slows, it's rich. Very much like glow motors.

I try for a solid idle without variation, even if left at idle for 30 seconds or more, then advance (dump) throttle to full immediately. If your low end isn't right, you'll see it RIGHT there.

Thanks Bob,

I'll try that.

After I started my engine today I was making some adjustments in the Tx while my engine was sitting idling for at least two minutes. I didn't notice if the RPM was increasing or not, but it seemed to be running fine, but I'll try your test tomorrow. Interestingly, the idle always seems to increase from where it was when I first start the engine to a higher rpm after the engine has warmed (after a flight). I always have to bring down the throttle trim several clicks to bring down the idle rpm when it's time to come in for a landingthus, indicating it may be a little lean (as you suggested).

Some of that is normal, but too much creates what you're seeing.
Let us know what you find.

My experience has been that although the overall adjustments aren't critical or touchy, the "sweet spot" of overlap of low to high which gives the best idle and cleanest transition is pretty narrow. Probably less than 1/8 of a turn, total, between the two needles. Think "thin screwdriver blade tip thickness" adjustment increments, the closer you get.

Oh.
Don't forget that if you change your oil ratio, the adjustments you just got "perfect" will require re-tuning because of viscosity difference of flows inside the carb chambers.

Hello been reading up on some of this thread really thinking about one of these DL-50 's for my great planes S2c pitts been running a Super tigre 3250 with not much results works really well when its running !!And that is far and few between its been sitting in shop all summer with three flights on it just tired of fighting the engine. So would this engine do me justice the price seems right for my budget. with the 3250 my weight is 15pds I had a christen eagle with a Fuji 50 its weight was 20 pds it flew really heavy in the air and wasnt very comfortable to fly [ like tryin to fly a brick with wings ]!!!! Really dont want to go back to that kinda weight if possible.
Maddog

Drop in that DL 50 and enjoy the the crazy power to weight ratio you will have on that pitts. you will also save a pound or two over that Fuji and be able to swing a better prop like a vess.

I'm flying an RCGUYS 1/3 scale Pitts at 15#. with the DL50 and 22-8 XOAR. It will do more tricks than most pilots can handle, and will vertical out of sight.. You'll be happy with this combo.....

Maddog,

I've flown both the Pitts and the Eagle with US Engines 41 (I don't remember if that's the correct size for the US Engine), SuperTigres, Fujis. I liked the Eagle well enough with the Fuji and it didn't seem to fly heavy for me, but it definitely could have used more power.

I'm running a DL 50 in my Great Planes 27% Extra 330S ARF and I absolutely love the engine. Try a DL in your Pitts and I'm sure she will no longer be a hangar queen! You'll want to get a Pitts muffler. I got the J-Tech from DL USA when I got my engine, but I didn't like the way it was made (more of an appearance thing) and the part where it bolted onto the engine stuck out too far (but it would probably be okay in your Pitts cowl (more room than the Extra I bet). I got the Slimline muffler that is made for the DA and I like that muffler much better.

Best of luck!

The DL would work fine on that plane, I have a Christen Eagle II with the DL 50 and Ion battery pack with regulator total weight 18.2 and it flys well not heavy and it gave me unlimited vertical I do enjoy flying that plane,

Anybody has some pictures of a GP 1/3 Pitts Special with a DL-50? I would like to see this combo.

Thanks guys for all the feed back it sounds like a done deal then! Will be getting one and trying it But first Ill need to blow all the dust and cob webs off of her
Thanks Maddog

I use the DuBro No. 506 30' roll Tygon Large. Don't know which one that equates to in the 3' rolls, but I think it measures 1/8" (I inserted a piece of 1/8" brass tubing into the fuel tubing and it goes in with a bit of a "squeak," so I'd say it must be 1/8" I.D.).

I use the medium tygon and the reason why is the fuel line will swell a bit in the tank, i know this because i had a fuel line come off in flight. I also use the brass barbs solidered on the brass feed line in the tank

So many guy's run there engines on the ground for ten to fifteen minutes and it just is not cooling off, it needs to be in the air and worry about your RPM after it is broken in.