I need to know would this engine with 15.6 lbs thrust be strong enough to fly 3d with a 11 to 12 lb plane?

No.

Well visioneer_one is correct although quite brief! You really need about 1.75x more thrust than the weight of the aircraft so can you find a plane that weighs in at 8.9 pounds to put the RCS 1.4 in? Maybe the Goldburg (Lanier) Ultimate Bipe.

3d yes as long as you are not including hover/torque rolling

rolling elevator
rolling harrier
elevator
harrier
blenders
wall
chute
H 2 O falls

torque rol 7/8 throttle and pull out very slow or not at all.
ps i had this motor on a 13 lbs plane

How about this engine on a Hanger 9 Ultrastick 120??

whats the weight of the plane w/os-160/satio 180 type set up?

It would help if you are under ll lbs i would say the sig cap is a better canidate for that weight with this motor ...

I had an MVVS 1.60 Gasser on a H9 Cap weighed about 12.4 pounds. It will do a lot of 3D stuff, but nothing that involves a lot of verrtical or hovering. This engine and the RCS 1.40 probably needs about a 10 pound plane tops, to be fully 3D. The big problem for .90 to 1.20 size gas engine plane combos is finding a light enough plane that is big enough to handle the engine mounting. The good thing about the RCS/MVVS engines is that they will basically go in a .90 or small 1.20 size plane were other gassers will not.

At the time I had the 1.60 Gasser in the Cap I also had the same plane with a Saito 1.80 in it. there was no comparison between the two.

The US 120 with the Saito 150 weighs 11.5 lbs ready to fly. Using a 16x8 prop, at 8900 rpm, the performance is very good. Doesnt sound like the RCS would quite match up to this.

My RCS 140 will turn a APC 16-8 at 8900-9000 rpms. All up weight of the motor and all support gear is just under 3 lbs. Compare that to the Saito 150. My guess is the 150 is about 1/2 lb lighter? Don't forget, you'll only need half the fuel tank size with the 140.

Kevin

tipover what all props have u tried on the rcs?

APC16-8,16-7. TopFlight PowerPoint 18-6,18-8,16-8. Zinger 16-6. Been to long to remember all the rpm's I have a APC17-6 I'm wanting to try as soon as it starts warming up here, I have high hopes for this prop. Should spin up as good as the 16-8. Just got about 6" of snow yesterday, and its a whopping 5 degrees today Its gotta warm up by the end of March

Kevin

tipover which prop have u like the best?

So far, the APC 16-7 seems best on my 25% Edge. Slows the down lines, yet it reels up real fast and gets moving. More rpms then the 16-8, so you gain thrust. Sense your not freezing down there, you should get your hands on a APC 17-6. Let me know how it works

Kevin

Flight report:

I've had a chance to get 4 flights in on the funtana:

set up as follows:

RCS 1.4 w/10oz tank
1100 on int. ni-cad
1650 on rec. NMHi
5-5645 Hitec
2-225 Hitec Throttle/Choke
11.25 lbs
CG backside of the hooks (hooks are no longer there as I replaced them with nylon bolts

With this AFT of a CG the plane will still dive a little after a 10-15 second inverted flight.

No snappy behavior with this CG.
Elevators very easy
Harriers very easy

The plane will just float around the sky with those Huge wings. The plane can land as slow as 3-4 MPH very very stable.

I also tried out the following props:

18 x 6 APC Wide
18 x 6 Mejzlik
16 x 8 APC

The APC W. 18 x 6 seems to never let the motor wind out The verticle was great with all the above props.

The 18 x 6 Mejzlik was great in all aspects of spool up time, downline braking, 3d.

The 16 x 8 took quite a bit of work to do T-rolls as the motor has a small margin of what the 16 x 8 will work with.

The 18 x 6 Mejzlik was so very stable in the T_Roll. I did my tests in 10 MPH so the plane should be so very easy in less wind. The RCS 1.4 will pull out of a hover but its not a rocket just slow and steady. The plane is so solid in the rolling elevator/T-roll. I don't think i will do any snaps or blenders with this bird as the tail looks 2 be a week link in a hard move like that. I feel it would not take much to make it depart the plane. I had an OS-160 on stand-by incase i needed it. I will not be swapping that motor off as this is great; however, for those of you doing the MOki 1.8, OS-160, ZDZ 40 you all are going to have one bad beast! My OS-160 are some very good gas mileage motors. My RCS comes in with a little over a 1/4 tank of gas on 12 minutes flights. So if you are weight saving on this motor install a 8 oz tank. My 20 oz tank on my DP comes in about 1/2 on a OS-160 so that is a great gas sipper 2. Warm weather is right around the corner for most of you so get those Funtanas ready as the Fun part of that name is so true......

Krayzc,
Thanks for the flight report.
What rpm's did you say you were getting on the Mejzlik 18-6? I may need to get one of those

Kevin

off the deep end i think i was gettting between 8100-8200 but i need to double check that figure for you. As this was the last prop i test and with the others ones i kept all these figures in my head as i usually write them all down..... Tipover that 18 x Mejzlik was night and day. I say this because sometimes a prop only does one or two things better than the next or sometimes it very very hard to see the difference. with this swap out it was very easy to see a difference......

I run the 18x6 Mejlick on my 1.80 Saito and get right at 9g's. Great throttle response and excellent verticle. I just picked up a 1.80 RCS to go on my Aeroworks Profile and RC Showcase sent a 18x8 with it. He said he was out of the 20x8. I'm wondering how big I can go if I use a CF prop on it?

I just wanted to state a fact about power to weight ratios etc.
Chip Hyde flew the Sh___-! out of my stock Areopro Laser with a stock G-62 on c&h ign and with the plane at 19-20lbs and the G-62 pulling 25-26pounds of static thrust I think the ratio is closer to 1.4 at 19 lbs thats 26.6lbs of thrust. And we are at at least 2000ft elevation here in vegas. Just for info Thanks