gwulle

I am a previous owner of the 50cc Yark,so I am familiar with your great quality. I am interested in the 50cc Extra and I have a OS300 Twin(49cc) that begs to go in this plane. I am not a 3D pilot and would like to know if you think the 300 Twin will do the job. I am almost certain it will fit in the cowl with no mods. What is the with of the cowl at the front? Any help would be greatly appreciated.

Gaines

Mark Dennis

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Gaines,
I have not heard of anyone trying this motor in any of our 50cc planes so I can not comment on how well it will work. The plane is being built at about 16.5 pounds with a DA 50 so if your motor can handle that weight you will be fine. I will get you the cowl size tomorrow.

reyn3545

A buddy of mine has an OS300 Twin that he put in the new Hangar 9 Sundowner.... its a rocket ship that sounds like a Harley. EXTREMELY fast, but he had to keep an uncomfortable amount of speed up or it would stall out. Even a final turn before landing had to be done under a good deal of power.

There should be plenty of room under the cowl for the motor. I don't know what the HP rating is on the OS300, but if it will pull a 17 pound plane, it will pull this one. You might have to get creative to get the exhaust out of the cowl area, but I'm sure it can be done.

gwulle

Thanks fellows for the reply. I have another 300Twin in a GP 1/3 Scale Christen Eagle and it flies great at 17.5 pounds. I made the exausts out of golf club shafts. The step-ups in the shaft act as power bands and it has a awesome sound to it. The engine has 4.0 BHP@7000 rpm's and is a 49cc engine. reyn3545,why was this gentleman having to keep the rpm's up in a turn for landing. Sounds like it wasn't pulling for some reason. Again thanks for the reply.

Gaines

reyn3545

Oh, it was pulling!! I think the wingspan was a little short for his flying style... he slowed it down for a final turn and approach, the low wing ran out of air, and it was pretty scary! The Sundowner doesn't have a huge wingspan, so you need some speed on it to keep lift.

This extra, on the other hand, will float as long as you want it to. Its without a doubt, the truest flying plane in my fleet. AW does a great job with the finish, and the airframe is smooth and exact. Very little if any adjustment required to control surfaces. If your motor will turn something like a 22x8, you should have a fun plane on your hands. It was designed for a 50 sized plane, so you may have to add some tail weight, but it should be a good flyer.

gwulle

I checked the weight of the DA-50R verses the 300twin and the twin comes in at 4lbs 5oz. verses 2.94 lbs for the DA-50. I did not realize the DA-50 was that much lighter. I do not know the AUW with the muffler and ignition,I'll have to figure that out. Thanks !

Gaines

reyn3545

Wow.. I didn't realize that OS was so heavy! Instead of a little lead, you might have to sit on the tail to balance it...but that would be fun too!

zope_pope

The Da will need the ignition and ignition battery though, the OS is ready to go. I think it would sound awesome. Post some videos!

Mokirock

what prop will you use?