Much to my surprize my wife just brought me home a new World Models Cub-48 ARF. I have had world models ARF's before and love the kits. What I need to know from all of you which engine out of the two that I have will be the best one to use. I have an OS 40 FP that is like new and also an OS 46 FX that is like new. The 46 is on another plane right now but I have other engines to replace it. Which one of these engines do you guys recomend. The plane will be used for relaxed flying nothing fancy. I have several other planes all the way up to 1\4 scale and can fly pretty good. I always wanted a Cub so my wife thought it would be good to get me one. She's a keeper. Let me know about the engines.

Thanks Rick

I would run with the 40. I run mine with the 4 stroker 52 surpass and it will actually haul.

I love the WM cub J-3 48, good luck with yours.

Does it have a 1 piece or a 2 piece wing?


Regards
Gasser 350

Right now it has a two piece wing as I haven't started to put it together yet. I will leave the wing in two pieces and fly it like that first an see how it is. If I have trouble with it I will glue the wings together.

Rick

The WM Cub 48 is a good fly9ing plane that is hard for me to get off the ground. I am using a TT54 FS, and it just leaps in the air and stalls if I am not quick enough to get the nose down. We fly from grass and on the takeoff it tries to nose over due to the drag. Then when I correct with up elevator, it leaps and stalls. Never a dull moment with that thing. It will also snap on you if you have too much elevator throw. I would try underpowering it to make the takeoff a little slower and more scale. Another member had one of the regular WM CUbs and it was the same way. His went to the swap meet. I'm still flying mine. Really scoots with the 54 on it. It lands fine as long as you don't try to slow it down too much on final.

This is off topic, but I start out slow and slowly raise throttle. I also mostly fly off grass and keep the elevator pulled until she really starts to roll. I then gradually let off elevator slightly allowing the tail to come up. When she builds enough speed she takes off.

If I don't give any up elevator she'll nose over right away.

The OS 40 2 stokes have more hp than the 52 4 stroker. I would think you'd be fine with the 40.

Then again, I'm trying to put a 91 surpass where the max is 70 surpass in my WM PT-26 I just don't think the cubs needs any more power.

with my .52 surpass, she has great climbs, rolls, loops (tight too), inverted flight etc.

I think you'll be surprised...

Hi

I have the WM clipped cub also and a buddy has one. Mine is powered with a magnum .52, and his is a TT pro .46. Mine has plenty of power for the cub and scale speed at 1/3 to 1/2 throttle. His will how do I say this a HOVERING CUB? Well either engine will work but the .40 would be plenty of power.
I fly off matting so don't know about grass. I guess that's why I never had the nose over problem. I also ease into the takeoff roll to maintain tracking down the runway and have no problem. Others feel it is a groundlooping squirrel and just nail and take off ASAP. Again either way gets you in the air but I think the classic style looks better. Anyway its a another great little plane by WM.

Rick,

I have the WM Clipped wing also, you guessed it, the red one. I have a Magnum 52FS in mine and it has plenty of power.

I take off like Adam, gradual power increase until the tail is ready to lift off, then some up elevator. When I first started flying this model I would slam the throttle open and it would go down the runway bouncing from side to side. I would end up pulling up as it was racing back across the runway for the third time. But now I know how to launch it and I have a much more relaxed time in the air.

As for the engine, I prefer the FS on these types of birds. If you can get one I would and have fun flying.

I flew the Cub for the first time today. It flew great. I ended up putting the OS 40 FP 2 stroke on it. It was the only one of the three engines that I had avaliable that the LHS had a pitts muffler for. I could not justify buying a new 4 stroke engine when I have 5 or 6 engines laying on the shelf that are not being used. The 4 stroke will come later. It turns out that the FP is the perfect engine for this plane. It has plenty of power and flies scale like at about 1/3 throttle. I have other tail draggers so taking off was no problem. I just eased the throttle on and kept it tracking straight. I had to give it a lot of up elevator to get it off of the ground. The plane also required a lot of l right trim. I had to run it almost to the stop to get it to trim out. I flew around for about 15 minutes and then landed. When I inspected the plane I found the right wing twisted. I will try the heat gun and see if I can straighten it out. It needs washout from the servo out. The twist is very noticable when looking at the plane from in front of it. I wonder why I didn't see it before. The plane flew good anyway but needed alot of trim to fly straight. I will work the problems out and fly it again later this week.

Rick

Rick,

Glad you had a good first flight. I saw that a few others mention they had the same problem with their WM Cub wings. I went over mine well when I went to the LHS to pick it up. I'm sure you'll be able to get the twist out.

If you have to give it a lot of up to get off the ground I'd say maybe try a different prop. One that will put more air across the control surfaces.


:bananahea

For over 20 years I have watched cubs have ground looping problems and just sat on the side line wondering what was going on because I did not own a cub. 2 months ago I got a WM 48 clipped wing and for the first 20 flights it was perfect, straight down the run way, followed by a gentle up elevator take off.

Then one windy day I landed hard and bent the main gear and did (what I thought) a good job of bending them back. The next day I was in for a store for a SURPRISE as I advance the throttle vary smooth, she started tracking to the right off the run way I corrected with left rudder a ( classic over correct) the rudder lifted the right wing, and yes that's when the fun began,banged the ailerons and rudder to the right(more drag)in a panic Pulled up(over corrected) causing a right wing snap sheeeese as you can tell I had my hands full, talk about A SQUARELY takeoff, should have crashed but the RC God's thought it would be funner seeing me mess my SHORTS INSTEAD. :stupid:

Best advice I could give STAY OFF THE RUDDER and have the elevator on low rates for takeoff

I didn't have any problems on the takeoff roll. The plane tracked fairly straight I only had to give a little tap on the rudder to keep it straight on the runway. The tail lifted off really quick but the plane stayed on the ground. I had good speed and had to give a lot of up elevator to get it airborne. Once in the air I had to click in alot of up trim to get it to fly level. I also had to give it alot of right trim ( like all but two clicks) to get it to fly straight. I am using an airtronics RD 6000 computer radio in this plane and it has electronic trim switches which have alot of trim adjustment. Once trimmed out the plane flew great with no bad habits. I have never flown a Cub before but did alot of research on flying them so I was prepared for it to do some weird things. I flew around for about 15 minutes and landed with no problems. On the landing when the plane was about 1 foot off of the ground the left wing dipped and hit the runway but the plane landed on its wheels and no damage. The wing just tipped and touched the ground very gently. One of the other guys at the field came over to me and said the right wing leading edge was higher than the left. We took a close look at it and sure enough the wing was twisted with the leading edge up. I did not fly it again. I will try to get the twist out of it on Wed night by using a heat gun and twisting it back into shape. I have done this on other planes with success. Hope it works. I am looking forward to flying this plane alot as it will become one of my favorites. the other plane that I fly alot is a Sig 4*60 I love it also.

Rick

I have the Blue clipped wing 48. It originally had a new os 40fp and was a great flying plane. I have to dial down the rudder throw to about 70% when I take off of pavement because it does get crazy and then I start digging in wing tips. I really dislike the pavement landings because of the springy landing gear and any cross wind causes me to dig in a tip. I ran a 11x3 and a 10x4 on the 40fp and both kept it at a nice flying speed with extra torque to get off the grass fast. I built flaps into mine that go from the inside of the ailerons to about 1 inch from the fuse. This is a must have mod! You can do this helicopter style take offs that were the plane is still parallel with the ground but just climbs amazingly fast. Great for SLOW receiver landings too (saved my butt a few times on dead sticks as well). I then put a thunder tiger 46pro in it. I have about 10 flights on it and can say that it is more aerobatic like a clipped wing should be but I miss the good gas milage the 40 gave me. I haven't fully adjusted yet and have run out of fuel twice. I run a 11x4 on the 46. The big problem with the cub is the landing gear. When the plane is properly balanced the tail is really light when on the wheels. So it loves to nose over (had the tail completely come over once too in thick grass). The other night I just the dremel and cut new slots for the landing gear about 1/4" in front of the original locations. Add a little lite ply to the inside of the fuse for the new mounting screws and the plane still looks proportional. The bonus is I can tell there is more weight resting on that tailwheel now and hopefully that will correct the problem. Haven't tried it out yet but will soon.

I had the same problem with mine. I tried putting a 1/4in. shim under the rear gear wires to rotate the wheels forward a little. It didn't help much. I think the grass is the biggest problem. I went out one day last week right after the grass was cut on our field and had two perfect Cub-type take-offs. Before, I was flying on Sunday when the grass was cut on Friday. We have a kind of grass in the South called bahia that can grow an inch in one day. So with a little rain and some heat it was growing enough in two days to drag the wheels back and make it nose over. Cooler weather is coming and the grass will slow down. I'll try more tests then. :-)

I got out the heat gun and fixed the wing. This thing flies great now. It takes off with about 1/2 throttle. This plane flies really good. It is a little squirly on the ground during takeoff. You have to land this thing witn a little power on and fly it down to the runway. Once you figure it out it is a great flyer.

Rick