3W75 and Comp-Arf Extra 2.3

[Reza]

Hey Guys,

Happy New Year to you!
I have a Comp-Arf 2.3 Extra that currently has DA50 with KS1060 tuned pipe. I would say it has marginal power and certainly not over powered. I'm thinking about putting a 3W 75 rear carb but really don't know how that engine would perform. I have heard bad things and good things about 3W engine. If any one actually have the engine I'm talking about please let me know if you are happy or not? One of the things I heard is they are hard to break in and very temperamental! Does that mean many dead sticks before they break in? Also is there any one with the same plane and 3W 75 engine that can comment?

Here's a video of my Extra with Da50 in hover, you can see the slow pull.
www.gholamipour.com/rcplanes click on video number 18.

Thanks guys,
Reza

[Flyinrazrback]

I have had a couple 3w 75s. Both ran great, no problems. Likes a 25x10 or 26x10 prop after being broken in. I think would be a good choice for it. But, a very good choice I would think would be the mvvs 58, think it would be perfect for that plane. But, if you can get a 75 for a good price, it will definitely be ballistic with that motor.

[skyesdad]

I have a buddy with that combo in it and it has worked great for almost 3 years and razorback you are spot on with the prop 26x 10 perfect. That thing is awsome!!! it will snap on the upline foreverand the only engine problems he has had were from a air leak in the fuel dot

[bryan01601]

I would go with the 3w75us (side carb) I has the same plane with that motor in it and an awesome combo. I was going to put the rear carb in but would have had to cut 1/3 of the motor dome off of the bottom for the muffler to clear. The us version is still reed induction just a side carb.

[Bunky F. Knuckle]

3W 75 on a 2.3m Compy?? SURE!!! Go for it!!! I'm thinking of flying one for a video for the XFC, and I've seen this plane fly, and it has SICK power!!!! I think that he was only twisting a 24x10??? Still, gangs of power!!!

The 3W's are not really that difficult to break in. I think that people try to get too much from them too early, and that could be a cause for dead sticks? Leaning the engine out, not good, of course!!! Keep it rich, for 5 gals, then lean it out some! Personally, I use all synth. from the first start. 50:1, and leave it rich. No biggie!! That way, when 5 gals are thru, I just refill my can, and go 60:1 synth. and lean the engine out, until I get it up to 200F after a 15 minute flight, then I back it off just a smidge. I don't like going over 200F, but if the engine is happy there, I'll leave it. Now, the AIS and CS series of 3W's, the paint on the cyl's will fool you, a bit. I think I read somewhere on FC, before they shut it down, that guys are running them at 250F??? No problems at all!!!

Chris~

[RC Loco]

Reza,
I have a Comp-ARF 2.3 Extra and powered it with a 3W75US and all I can say is ...WOW!!!
This thing will go vertical for as long as you have the eyesight. The 3W75US is lighter than the
rear induction 75, so you may want to consider that as well. I have had a few 3W motors and have
had nothing but good experiences with them. My 3W75US is the TOC version and currently turning a 24-10 Mejzlik carbon prop.

[SEG]

I had one yes i said had one with a 3w 75 and it was awesome. tons of power up until i balled it up

[The Kid]

Untill eric balled it up i was there

[Reza]

Thanks very much Guys. I feel a lot more confident to do it now. I think as you mentioned side carb is better because I don't have to touch the motor dome. What about stand offs? Does 3W have 3" stand offs? Can I redrill the motor dome for 3W or I have to order another one? This is my first comp-arf and don't know much about them. The plane flys good but I have lots of coupling in knife edge. I have 9% mix and still it pulls to the landing gear!! Please let me know if you have a healthy 3W 75US for sale too. Thanks again for all your comments. You guys are great.

[3D-Seth]

I have that exact plane (2.3 Comp Arf Extra 330) and have the side mounted carb. It is the high performance 3W 75 and it is awesome!! Hover at less than half throttle turning a Menz 24x10 prop. Harriers inverted or upright, harrier rolls within a foot of mother earth - no problem. The plane still flies very light. I too have a mix for knife edge, roughly the same as you, maybe a little less. (Futaba) Waterfalls excellent and very predictable. I have max deflection on all surfaces and you have to do alot of dremel work and cutting to get the throws out of the hinges - no big deal though. Harrier landings are very smooth and predictable. Elevators with the best of them.
With a different program in my TX I have a setup for IMAC and it shines there too. I do not use the mix for point rolls or rolls, only knife edge. Just back all the deflection way down.
You will definatley love it and I would be very dissapointed if I had to go back to a 50.
I only had to cut the cowling out at the bottom and a little place on the side for the carb. (Not much though) . I do not have cans, just straight pipes but the extra weight would not hurt it at all. I have had absolutely no problems witht the 3W 75 and we are a DA family! (Knock on wood!)

Hope this helps!

Seth

[SEG]

	Quote: Originally Posted by The Kid
	Untill eric balled it up i was there

haha that was pretty funny wasnt it. it doesnt help when you give the wrong rudder in a TR about 3 ft up does it .

[Neogenesis]

I just watched the vid on your website, and from what I saw your pullout was good. It wasn't ballistic like a ucan with a saito 1.00 i the nose, but damn good. Personally I wouldn't touch your setup. It looked great to me. But by all means, I can understand the need for power. It's that added level of assurance.


Neo Out!!!!

[choppedlow]

I was thinking about that Forgous Reserch 80. That thing would haul, balls. I have the pipe and DA50, as well. Im putting the 2.6 Yak with a 100 DA together at the moment, and when that is done, I will swap then. After that, I want to put the DA50 in either a ModelAviation Yak, or a ChipHyde Vision 3D. Once you go gas, the rest smell of ass! BUT man, do I love that 2.3 Pretty smooth my friend.

[Reza]

	Quote: Originally Posted by Neogenesis
	I just watched the vid on your website, and from what I saw your pullout was good. It wasn't ballistic like a ucan with a saito 1.00 i the nose, but damn good. Personally I wouldn't touch your setup. It looked great to me. But by all means, I can understand the need for power. It's that added level of assurance. Neo Out!!!!

Thanks Neo. You are right about the extra assurance and that's what I'm looking for.

[Sly3D]

I'm looking into getting the 2.3 Extra 300 with a DLE-55 with a Greeves pipe. Would someone tell me if it's enough for that plane.