Been staring at this kit arf in my living room for awile now. I have decided to build it and i want to fly it very soon. From looking at all the threads on the flip the plane sounds heavy and it is definatly big for a 40 size what is the best engine for great power? a 61fx too heavy? a .91 saito? anyone used a 70 surpass?

YS 63 would be the best choice. 70 Surpass would not be enough power. Saito 91 should be fine if it fits.

mine balanced out right on the money with a webra 50. and the weight is 5.3lbs.

Rossi 53, baby!

If you are talking serious 3D, you do not want to put a .60 size 2 stroke or .90 size 4 stroker in there. To much weight penalty, and therefore to high of a wing loading.
I am not saying that the plane couldn't use a 61FX, but you can get power also through a different way.
I had a OS 50SX with regular muffler (baffle removed) on mine, and it was lacking that extra bit of escape power on certain maneuvers or hovering. After trying all kind of different props, I still wasn't happy and decided that I needed a different exhaust system. The problem you have with this plane is that not many tuned exhausts will fit it due to the wing (Ultrathrust muffler won't fit for example). I did find however the perfect pipe (I believe) in the Mini Rossi tuned pipe available from Morris. It now has so much power, that it really shoots out of a hover, and you have to slow it down. Really ! Unbelievable power increase. The neat thing is that you can tilt the muffler up and down, so wing clearance is no problem. Midrange is also not a problem with this setup, and the engine doesn't jump on the pipe to soon.
My perfect combo for the Flip is: OS50SX + APC 12x4 prop + Rossi tuned pipe !
Just my $0.02

I have to agree with what Tex posted.

I am using a 50 SX-H, heli version. Prop choice depends on what you want the plane to do.

A 60 would make the plane too nose heavy.

If a stroker is what you are looking at, do the YS 63.

Plane builds in hours, not days, so you better make up your mind QUICK

i bought a .50sx just not at the LHS.
What is the weight of that tuned pipe? lots of times those big tuned pipe systems arent Any lighter than just going with a bigger motor (.61fx)

I go with ys 63's on all my planes of that size. I swing a 14 x 4 W APC and get 10 lbs of thrust. It is a great engine.

is it will be good with os46fx, for a realy good 3d?

I just bult a pizazz and I have a 61 sf and a 50 fx.Which do you guys think would be the best.I think the 61, but it is 5.5 oz heavyer than the 50

hmmm...... looks like you didn't understand my earlier reply !
The pizazz is even smaller then the flip. I would never ever put the heavier 60 on there. The 50SX should be more then enough for the pizazz !

Meeko: I don't really think the 46fx will be enough without a tuned pipe or muffler. I know there are people flying them with 46's but I doubt they are doing serious 3D with the Flip or have the escape power needed (for low hovering for example).

It is so funny how opinions differ. I don't think you could ever get 10 people to agree on anything, in this hobby especially.

I'm using the YS 63 on mine. Didn't even consider anything else.

Jim

First flights today with the os 50sx proved this plane is a winner. Except the landing gear with came right out on first smooth landing there was virtually no glue holding the plate in. Waterfalls are excellent, hovering is easy. Harriers are not quite what i expected but the 50sx has plenty of power for my 5.1 pound flip.
Its turning a APC 12-4 prop 13,500 rpms engine rich only 2 tanks through it. Got 4 flights on the flip before my field glue job on the landing gear plate gave out too

I have always thought a pipe was for high RPMS(pylon racing and such). For a fun-fly/3D plane, I thought you wanted mid-range. Are you guys just tuning the pipe for the mid-range? If so does the top end suffer? I'm putting together a Flip with a YS63 and then a GP UC3D, but not sure of engine for the UC3D!
Thanks guys

Doug

The Rossi tuned pipe setup is a real winner. Only problem may be those who have noise restrictions at their fields... I had a TT Pro-46 on my Knife ARF. Marginal hovering and pull out (could pull out vertically, but very slow). Put the Rossi pipe on and I was hovering at 1/3-1/2 throttle and it shot out of a hover like a rocket.

Made a single flight this morning with it, with an oS46FX and APC 12.5x3.75 prop. I don't like it (I have about 10 flights total with this engine). I had the same engine on my Madness before and it was fine. Seems like the Flip is more CG sentitive than the Madness and having the tank in the front make the variation too big to enjoy. The hovering is tough to hold at the beginning of the flight when the tank is full, then it gets easier and easier as time and fuel goes by. By the end, it is relatively easy but then, you are playing with fire since the tank is almost empty.

I want to change to a YS63 and place the tank on the center to reduce the CG variation. The OS46 is out!!

Ben

After you switch to the YS 63 you will wonder why you did not before. Doing it for tank location is only a bonus. The ys has superior throttle response and fuel consistency. I can hover my 5 LBS OMP all day long at about three clicks above idle. Be sure to use the APC 14 x 4 W. A 12 " will allow the engine to over RPM. Too high of RPM will damage the motor. Real 3D flying does not need a tremendous amount of RPM, you need low end torque and thrust. I can hold my 5 lb omp's nose up at about 3,000 rpm. This is at about 1/8 throttle. You will have 7/8 throttle left to power out of a boo boo. At this throttle the motor is quiet, smooth and easy to handle. A two stoker has to develop more rpm's to gain the same thrust. It will be more jerky. Don't get caught in the RPM and HP game. For real 3D flying you need thrust. With the ys 63 and the 14 x 4 you will have a 2 to 1 thrust to weight ratio. That is the key to good 3D. A two stroke will not deliver that much thrust (low end) on a plane this size.

remcl,
I have to give a good AMEN! to that.

Jim

Doug, the OS 50SX on my flip doesn't jump on the pipe until about 3/4 of throttle, and that means that I still have a good midrange and idle and therefore no problems with that. I only use full throttle to climb vertical, or escape out of some sort of mishap !
Can't say anything about the UCD, since I have never had one or flown one.

put another 10 flights on the flip today. Its been very windy here so i havent been able to test the flips harrier ability but it sure hovers great and the 50sx it just sweet. Every time ive tried a YS motor i always sell it ALL ys engines are heeeeeeeavy!!!!!!!!!!! dont matter how much power they put out their too darn heavy for my taste.

what u guys say about rossi 53 ??
430gr 2.8hp @ 18000 rpm

(i can't buy ys in my country)

Oh Yes, that Rossi will humble the OS 50 SX.

I had a rossi 53 with tuned pipe on my OMP. The horse power seems impressive, but it is at 18,000 rpm. Great for racing, but not for 3D. Also the rossie likes small props. 10" or so. To perform 3D you will want as large of prop you can swing without hitting the ground.

Constrictor,

look at the overall weight of the engine and muffler. The four stroke muffler is much smaller. When you do this the weight of the 63 is not that bad. Especially when you compare to a larger motor with tuned pipe like the rossi. Again, like I said before, the key is thrust to weight ratio period. Not HP, not, RPM's.

I have a buddy who has a ucd3d and he has a saito 100 on it. It is awesom. Another has a OS 108 2 stroke. This combo is not bad, but the satio hovers better. After seeing the 108, I doubt a Os 91 would be enough for 3D. If I get one, I would use the YS 91.

I saw the Rossi 53 review at Just Engines, and they say the 53 can swing 12x8 at over 12000 rpm w/ the mini-pipe. So using a 13x4 APC (the narrow, not the wide), I could see it turning at 13000 rpm, which is real good for the Flip. That's more thrust than a YS 63 would ever pull w/ a 14x4W @ 10500. Weight is 440g + 90g for minipipe = 18.65 oz, which is just a hair heavier than YS 63's 17.9 oz (including muffler?) I would still go with the YS 63 for the fuel delivery system, but theoretically, the Rossi 53 could give more thrust.

http://www.justengines.unseen.org/Rossi53r.htm

PROP PERFORMANCE ROSSI MINI PIPE

10x6 RAM 17.500 RPM

10x7 RAM 16.800 RPM

11x6 RAM 14.300 RPM

11x6 APC 14.100 RPM

11x7 RAM 13.900 RPM

11x8 APC 13.500 RPM

12x6 RAM 12.900 RPM

12x8 APC 12.100 RPM

13x8 APC 11.100 RPM

Idle 2.800 RPM

Average noise test: 96 DB at 7 meters

The ys.63 WITH muffler is 1/4 pound heavier than the os .50 WITH muffler. I dont want another 1/4 pound on my plane no matter what it does. The one drawback to the 2 stroke is the muffler points right at the wing and its unbelievable how much slime collects on the wing on every single flight. But of course when your 3d'ing alot ALL the oil goes onto the wing were normally some of it would blow away. So far i love the os