I recently got the World Models Extra 30 Sport (the red one) and I put a Thunder Tiger GP 42 thinking that even a 40 sized sport engine would be overkill (which I prefer) for this 30 sized sport plane. I WAS WRONG! This engine has very nice running characteristics but not nearly the power I was hoping for. And this plane seems to be a little on the heavy sider for a 30. So I was hopeing for some suggestions. I would like to stay at or below 15oz, with the muffler, to keep from haveing to use a lot of lead to ballance. It seems that you either have to go with a light 32-40 enigne that is low on the power range. I can't seem to find anything with power in the 1.4hp range that isn't over 16oz's. Please give me some educated suggestions from your personal experience so I can find the right engine for this nice flying plane. By the way, I am hoping for something that will give this 4.5 to 5lb. plane unlimited vertilce. Thanks for any input, Eric.

I have been looking at this plane for a few months now. I love WM kits, I have the chipmunk and would love a small arf I could just throw in the car.

I was thinking about this plane with an inverted satio 40 4 stroke, rpm data shows a 11/5 apc prop at 10200 rpm which would be 4.57lbs of thrust and the wieght of the engine is about 10oz.

I don't think looking at hp is a good idea... look at what rpm an engine can turn a prop.

I think that would be a fantasic combo with the sound of a nice 4 stroke.

there are so many engines I want for 25-30 size planes. I'd try either a Super Tigre G34, which is a fantastic easy engine, or the new Saito 40.

I was on a budget with my Supra Fly 25 pattern plane so I put in a .40 LA, and it was quite adequate for near out of sight vertical with a 10x6. Plus it's very light and so inexpensive.

If money was no object I'd be torn between the G34, saito 40 or even the OS 32 SX.

a buddy of mine has the same plane (red one too) and has an os 46 la mounted. plane has just about enough power. we were looking the dimensions of the plane and the weight and size seems to be more appropriate for a 46 size. just as one of the stickers on the plane has the number 46 on it.

i did have a world models sukhoi-31 and that plane was significantly smaller and lighter than the world models extra 30.

i do have a couple of 32sx's in hand if i were to asked if would put an engine of that size on this plane. answer would definitely not. thats just my own personal opinion. if you could at least put in at a least a thunder tiger 46 bb or a OS 46fx i think that would be great.

I am flying this plane with a O.S. .40 FP just because that is the engine that I had. If I were to buy an engine just for this plane I would buy an O.S. 46FX with a Slimline Pitts muffler.

I have heard of others using larger engines but I think the .46 will give you plenty of power.

BTW: This is a really fun plane!! Snap rolls are incredible!

Inverticle, how about the new Irvine .39 engine? Seems like it might be a good match for it........

Try the Webra Speed 35, swinging a 10x4 APC this combo won't quite give you unlimited vertical, but you don't want to fly it out of site anyway.

I have been flying this combo for 2 years now and still love it. I especially like the inverted flat spins, slow, tight and flat when you feed in opposite aileron.

GREAT little plane...I haul it and my Pizazz to the field in the back of a mini van with no assembly required.

Thanks for your input guys! I think I have decided to go with the Thunder Tiger Pro 46 and a Slimline Pitts muffler so I can put the cowl on without haveing to cut it to shreds. I will have to add a little tail wait but not too much. This should give me the overpowering effect I want without breaking the bank. Please let me know what you think and any info on the Slimline Pitts muffler like does it weigh more than the original and stuff like that. Maybe you guys know of a better in-cowl muffler that works better? Thanks for the input, Eric.

If I was you, I would put the O.S. 46FX on it. It weighs less and has more power. Although, it does cost about $30 more.If you go to towerhobbies.com, you can see the spes there. It produces 1.62HP @ 16,000RPM and only weighs 16.45oz with the muffler!
It should be plenty of motor for the Extra 30.

You might be right. If I didn't get the Pitts muffler and got the OS instead, I could spend about the same. Is the OS a better engine, as far as reliability and quality?

I think that the O.S. is just as reliable and is of equal or better quality myself. I have never had a problem with my O.S. engines. I did have a TT 46 on my first plane, and it was a great engine as well. But for the Extra, I think I would go with the O.S. Just my opinion!

I am confused. The Ace website says that the Pro 46 is 15.84oz's and Tower says 17.01oz's. Which is it? And supposedly the magnum xl46 is only 16oz's. Is this enine any good at only $89.99?

I think the tt 36 pro would be great. or a saito 40. however I like to fly on the wing and don't grossly overpower things.

The TT Pro 36 have almost identicle specs as the GP 42 that I had in the plane. And I was definitely wanting more power. I do prefer to fly on the wing as well, but in the case of aerobatic models like the Extra 300 I prefer to have an adequite reserve of power to perform your manuvers with authority. With the GP 42 I found myself flying almost the whole time at full throtle. Any less than full and the plane felt like a trainer (slow and boring)! So you can see why a .36 won't cut it for this plane coupled with my flying preferences.

On the ace site, that is the weight of the engine without the muffler. The one on towerhobbies is with the muffler. If you go back on towerhobbies.com you will see that it says the weight of the 46fx is 13.2 oz/16.45 oz, the first weight is without the muffler. Hope this helps.

Hey flyboy11, I thought the same thing when I first looked but then I started thinking about and it didn't make sense that that was the case. First of all, the TT pro series is pretty much a replica of the SF series and very close to the FX series. If what your saying is true than that means that the TT engine without muffler weighs over 2.5oz's more than the 46fx without muffler. That doesn't seem quite right. Especially since the TT engine doesn't have a remote needle valve to add more weight like the FX has. Secondly, all of the other specs for the other engines on the ACE site seem to say the weight of the engine w/muffler. For example, the GP 42 says something like 12.6 which I know is the wight w/muffler. And the Pro 36 says something like 11.8 (I can't remember the exact number) and I know that that is the weight w/muffler. So you can see why I would question the Tower Specs for the Pro 46. I know that 15.8oz's seems a little light for that engine with the muffler, but I think that it also seems too heavy to be the weight without the muffler. Hope this makes sense.

I have both the tt and the fx , they are both 16 oz. engines with muffler. give or take 1/2 oz.

sorry about the weight figures that should have been without muffler, they weigh the same however as stated before. they also run pretty much the same.

Had one of these (blue version) for a while with an OS 52 Surpass up front swinging a 12.5" x 6" Bolle clubman prop. It went up like a scalded cat.
It really is a lovely aeroplane to fly, but just be careful to keep the airspeed up. The stall, when it comes, can really bite.
Having to choose between turning or going through a tree, when the wick has gone out, just as you come out of a stall turn at 25 ft, travelling down wind, isn't funny.
Ask me how I know!

Modelflyer99, That sucks! I have had my own stalling experiences with a Tequilla Sunrise 25. I tried a stall turn and did a barrel roll strait into the neighboring field. The plain was toast. I found the fuel tank about 20 feet from the rest of the plane. Don't ask!? Anyway, I can feel your pain. Thanks for the advise though. By the way, I didn't know it came in a blue version. Atleast it doesn't seem to now. Maybe that was an older version? Anyway, I might be able to afford a Magnum 52 four stroke? Do you think that would give me the power I want. I had an OS 52 and it did give me better pull than a sport 40 but not much more power. Thanks again, Eric.

The blue version is, ( I think), no longer made. I got it as a cheap clearance from the UK importers of World Models, who also just happen to be my LHS.

I've never owned one of the Magnums, but when I've looked at them in my local shop, they seem VERY similar to the OS, so I assume the power output will be about the same.

With the OS52 up front, the Extra would hover, for a short while any way, but it was a little lacking in power to pull out from the vertical.

For general sport flying it was much more than ample. The day I test flew it, the grass on our strip had not been cut due to rain, and was very long + causing all sorts of problems for people flying 40 - 46 powered trainers. I figured that the drag from the grass would stop it getting in the air, but when I pushed the throttle stick forward, it shot away like it was on smooth concrete and was airborn in 20 feet! Great Fun!

Andy E.

Inverticle, almost forgot, you can see the blue extra in my gallery, hiding behind the Zen50

Andy E.

I decided to go with the new Magnum xls 52a 2-stroke. I figured if I wasn't satisfied with a sport 42 than a high performance 30 sized 2-stroke didn't make much sense. And as far pure power goes, the 50 4-strokes aren't that much stronger either (at least not enough for me). And I thought about the BB 46's and thought that seemed a good fit for the overpowering effect that I am going for. But then I saw that the Magnum 52 was only about 1oz heavier and a lot more powerful. It also seems to have mostly positive feedback from the users at RCU. You can also get it with a free glow starter w/charger, 2 thunderbolt glow plugs, a four way wrench and a crank fuel pump. That seems like a good deal to me. And I am makeing up for the added weigh by using micro and mini equipment. And I am going to use a GP 12oz tank as someone on this post stated could be done. This plane seems to be very solid and strong so I don't think any extra reiforcement is necessary. Especially if I use most of the power for vertical and not for all out speed. We will see. I will let you guys know how it works out. Let me know if you have any suggestions or comments. Eric.

Inverticle,

When you get that 12oz tank mounted can you post a picture on this thread? I can not figure out how he did this!!

Thanks,