DA-50
 

Living out in the middle of the Mojave desert, there are not a whole lot of fliers around. I am looking towards some people that have some experience with this engine (it's my first gas). Any comments on set-up, start up, and break in are welcome. (I am putting it on a 27% PA Edge {about 14LBS built)).
Thanks

RE: DA-50
 

It'll give you unlimited vertical. Run it in with a Master Airscrew True/Power Point 22x10, run 3-5 gallons of fuel with the recommended oil (lawnboy Ashless), then switch to synthetic of your choice, and switch prop to a Master Airscrew True/Power Point 24x8. When starting, do this" Don't touch needle setting from manufacturer, ignition on, choke on, throttle to half, flip til it coughs (noe it has fuel), then do: ignition on, choke off, throttle just above idle, and flip till it starts. Mount the prop so that you encounter resistance (compression) at the 2 oclock position, whe viewed from the front. Flip the prop on the tip, so you get your fingers out of the way when it fires. After the engine fires, let it idle for 1-2 minutes to warm up, then slowly advance the throttle to full throttle. If the engine hesitates or backfires or have to be nursed to higher rpm, turn the low needle out 1/8 turn and repeat. There is probably not much of a chance it is lean as it is new. When reaching full throttle, listen and if the engine reaches peak rpm, then drops in rpm the high is lean, richen the high needle 1/8 turn. Probably not much chance it is lean right now, but if rich at WOT, you will recognize the sound from the gloow engines. This is a great little engine, you couldn't have chosen a better first gas engine.
DKjens

RE: DA-50
 

Hey DK, since you seem to know a lot about the DA50 let me ask you this. I just bought a used one that came with the standard 3" standoffs. I was talking to some other guys that said that DA sells shorter ones. Do you by chance know exactly what length they come in? I gotta try to figure out how this baby's gonna get mounted in my new CapX.

RE: DA-50
 

tailspnr,
are you sure you need shorter standoffs? Do you have the Cap yet. I think DA sells them +/- 1/2", but better answer would come directly from DA. Any other stand-offs would be just fine too. I had a DA50 in a DiablotinXL. I decided to cut the firewall of and move it back to where by lengthening the stand-offs by about 1-1/2" the carburetor would breathe fine without a hole in the firewall. I would have had to do something to the firewall anyways, since the engine stuck out to far. Once you realize that you HAVE to cut into that nice new virgin ARF, even one from Chip Hyde ha ha, it is easy to mount these engines with rear carb., just think thrice, measure twice, and cut once he he. Good luck with the Cap, should be an awesome 3D machine.
DKjens

RE: DA-50
 

Yeah, Ive done the measurements and I will have to do something in order to fit the cowl. Eiter I use shorter standoffs with a hole in the firewall for the carb or I move the entire firewall back by an inch or so. I asked Chip and he said that he cut a hole in his firewall. He also mentioned that the lomger standoffs were sometimes hard to keep tight. I got a machinist buddy so I'll prolly just measure them to what I need and let him whip me out a set.

RE: DA-50
 

tailspnr - If you can't get exactly the size you want from DA, here is the website for Aerografix.

http://www.geocities.com/roger_forgu...l?949625721150

Roger Forgues is a modeler and he makes stand off spacers custom sized to order. He will take good care of you. I was very pleased with what he did for me. I cut my firewall to mount the carb inside. My needle valve ended up in the middle of the FW, but only had to make one adjustment on the engine new out of the box. Just didn't see the firewall issue until after I had ordered these. Had a bit more room, but not much for the cowling clearance. I have mine in a Pitts. You will like the DA. DKjens is right on about the engine. Good luck and hope this helps.

RE: DA-50
 

Thanks for the advice..Another question...
A guy told me in another forum that the 14LBS Pacific Aeromodel Edge is to light for a DA-50..(mfr engine is 42cc) does anybody know anything about this engine and plane combo?
Brett

RE: DA-50
 

Well now I guess that all depends on your intent with the plane. My CapX is suppossed to finish out at no more than 12.5lbs. This thing should hover at just above idle;):D;)

If your planning on any type of unlimited aerobatics or 3D then your DA50 is actually perfect for that plane. The person that told you that may just fly mild type aerobatics and doesnt yet appreciate the power to weight ratio of 2 to 1 or better;)

RE: DA-50
 

I have one in house for comparison testing. A great engine, it is turning 8.1k rpm on a 20 x 8 zinger. That's 300 better than the next more powerful engine the Bme 50. and 700 better than the new YW 48

RE: DA-50
 

Third Question..If I mount the tank on the CG, will that require a perry pump to get fuel to the carb? Or will thier be enough pressure for the tank from the exhuast?
Thanks again

RE: DA-50
 

Fourth Question...how big of a fuel tank does this engine need (15min). Is about a 500cc about right? or can a guy get away with a 380cc? What do most of consider a normal size fuel tank for the DA-50?
Brett

RE: DA-50
 

I consider a 20-24 oz tank about right for a 50cc gas engine...

RE: DA-50
 

Brett, to answer your third question. The carburetor on the DA50R, and 99% of gas engines, has a pump built in, DO NOT RUN MUFFLER PRESSURE TO THE TANK. We all try to mount the tank on CG on gas planes. To answer your fourth question. The DA uses significantly more fuel during the rich run in period. I got 10 minutes on 16oz, but when fully run in and leaned out, 16oz will easily last 15 minutes, unless you're racing. To be on the safe side, install a 20 oz tank, and keep flite times to 10 minutes in the beginning and check fuel levels after flights.
DKjens

RE: DA-50
 

Hey, I know where Terrebonne is. My family lives in the area. You'll like going with a good gas engine and being at a couple thousand foot elevation and warm summertime temps you'll like the extra power too. I'd go 20oz on the tank. I have a G62 on one plane with a 24oz tank and get 20min+ flights depending on throttle with plenty left when I land. Just because you put in a bigger tank doesn't mean you have to fill all the way up.

RE: DA-50
 

Thanks for the input...so 20oz tank...no pressure tap. will do. They send one with the muffler (pressure tap). How come?

RE: DA-50
 

The tap could be for smoke... Also -- you need to run the vent line up and over the tank, and then down the backside of the tank out the bottom of the fuselage. There is an old thread with pictures about running the vent line for a pumper carb that you should be able find by searching this forum...

RE: DA-50
 

What size drill bit to ream the prop?

RE: DA-50
 

DKjens,

You mentioned the Master Airscrew True/Power Point prop in a 24X8 size. I looked on the MAS web site and did not see this propeller listed. Where did you find the 24X8 prop? Also, what catagory is the True/Power Point prop?

Thanks,

Craig