mrbigg

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i did a search and couldn't find what i was looking for. can anybody tell me how heavy the plane can be and still have unlimited vertical? what rpm with what props. thanks.

Hobbsy

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This 4 1/2 cubic inch radial weighs in at 6.5 pounds, including the short manifold exhaust pipe. Perfect for large 25-50 pound aircraft, it turns a Bolly 22x10 prop at a solid 8000 RPMs on 15% PowerMaster 2-stroke fuel--that's over 40 lbs. of static thrust! It delivers this incredible power with very little vibration--about 1/10th the vibration levels of comparable single cylinder 2-stroke engines. Soft mounts are not necessary with this monster powerplant.


From Horizon's website.

mrbigg

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hey hobbsy, that's what they SAY, but is it true?

TLH101

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A friend has one in a Yellow AT-6. It is just starting to run on all 3 cylinders consistently. Took several gallons of fuel to get to that point. It's turning a 22x10 Pro Zinger at 6800-7000 rpm. That's about 30-33lbs of static thrust.
I don't know what that translates into as fas as unlimitrd vertical performance.

mrbigg

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thanks terry- i figured that it would take some fuel to break in.

WycheG

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I get 6800 rpm with a 2-blade Menz 22x10 using 10% nitro (hey, I'm a cheap ******* ...). I've tried over a dozen different types of 2-and 3-blade Menz', 2- and 3-blade Mejzliks, 2- and 3-blade Bollys, and 2-blade Pro-Zingers (the worst performers of the bunch) and I think the 22x10 Menz is looking like the best choice of prop. My 450 flew my 25.5 pound H9 Sukhoi very well, as far as I am concerned, but I'm not into 3-D and didn't buy the engine for aerobatics (I bought it for, and it now resides in, a Bates N1K2 George that I got about 80% complete now and just hung it in the Sukhoi 'cause I was anxious to break it in) so flat out maximum power to weight was not uppermost in my mind. I think if you really want "unlimited" vertical then one of those ZDZ 80's or something in the 100cc class may be your ticket 'cause they got more power and significantly less weight, but if you want a strong radial that's got some class and just sounds cool then the 450's your engine.

If you want all 3 cylinders to run you got to lean out the low end significantly from the factory "setting". I think (from my own personal experience) the cylinder dropping thing is very much caused by a rich low end. I still use a glow driver (I bought it and am not interested in losing the extra weight so I use it ...) but I don't really need it any more and you won't either as soon as you get your low end set. Setting the low end properly will also reduce fuel consumption dramatically and give a better/smoother/quicker high-speed transition. Other than that, William Robinson on here's posted some GREAT gouge on fine tuning this engine and correcting some of the more complex problems (thank goodness I have not had any serious issues with mine though) so I'd recommend searching through some of his old posts.

Greg

William Robison

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Biggy:

Thrust at 30 pounds is much more realistic than Horizon's claimed 40 pounds. They have been taken to task for the claim already.

With a 25 lb plane unlimited vertical and hovering should be possible, but not a lot of reserve. At 30 lb maybe if everything is just right. When you reach 35 pounds, I say "Good luck."

Bill.

mrbigg

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thanks guys, that's what i was looking for. been looking at the gassers and then i seen a thread with the saito and thought it looked cool. probaly better off sticking with a gasser.

Hobbsy

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I plan on getting a Saito 4.50 for a Bruce Tharpe Super Flyin King.

mrbigg

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will the King handle it?

Hobbsy

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I've seen them at Toledo with some big gas twins on them. The gas twins don't have twin sound.

WycheG

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Yeah, you may very well be better off with a gasser. It all depends.

I love my 450, I really do. It's perfect for me. But I'd compare the gasser/Saito 450 engine choice to the crotch rocket/Harley Davidson choice in motorcycles. You know, if you're one of those guys who wants maximum pure, unadulterated, raw power and all-out performance then the crotch rocket/gasser is for you. If you're a guy who doesn't just want to get where you're going but you want to "arrive" with a certain amount of style then the Harley/Saito 450 is your machine. Not that one is better than the other or anything is wrong with one or the other, just different strokes for different folks. I only comment here to help you to be sure you know which type of person you are before you lay down your money.

Hey, Hobbsy, I been looking at a Super Flyin' King too for a long time now as a plane to put a 450 in too so it's funny to hear you mention it. Go for it -- and post pics so we can all see ...

Greg

Hobbsy

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I have NIB FlyinKing kit out there, it's my second one. I like em.

mrbigg

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your right about the crotch rocket- harley thing. i've owned both, so i know what your talking about. that is why i was wondering how good the saito performed. i need the power, but i would also like to "FLY WITH STYLE".

TLH101

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Don't forget cost of operation in your decision making. That Saito is thirsty when using the high end of the throttle, and glow fuel ain't cheap anywhere .
I do have to admit, the 450 my friend has in his T-6 does sound sweet, and just ticks over at idle now that we have it dialed in.

mrbigg

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have to take a loan out to buy fuel!