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Ultimate engine for SuperHots

I've not flown in a dozen years. I have a Midwest Superhots I flew briefly back then, but primarily with a Royal 46 Yes, underpowered of course, but it pulled amazingly well. I put an ASP 75 on it but that engine was impossible to start. I may have gotten one or two flights with it.

So I really don't have good feel for selecting a solid powerplant for this plane. Midwest specifies a 60, but that thing is a chunky, solid pile of balsa. I'm looking for unlimited vertical and I think that airframe could tolerate around 1.0 cubes in a 2 stroke, or more in a

4 stroke.

The OS .91FX and 1.20AX look interesting. Prop clearance may be an issue with the larger engines. The glow 4 strokes are pricey. The new Zenoah G20ei looks interesting. Any of these engines would work in the Ultimate Bipe I mentioned in a previous thread.

Thoughts? Dave [The Ultimate has been shelved for now. It turns out a portion of the box was soaked when an outside spigot froze and burst. Much of the wood is moldy or warped. Would have to buy a new kit. I thought I'd get the already built Superhots going to see how my interest in the hobby goes. The SH will require some Buddy-boxing initially, especially with a juicy mill.]

Reply to
DaveH
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I happen to have that plane. I had a TT61Pro on it until I knocked the firewall off by hitting a brick wall(don't ask why a brick wall is next to the runway). It did not have unlimited vert. It is a heavy pane. There's no way that Zenoah 20EI is going to fit, and if it did the weight would be too much to fly! The least weight for the power is what I want. Maybe a Webra speed 55 with a pipe? I have a Webra speed 50 that I really like. As a matter of fact, when I hit the wall I had attached a beer can pipe on the stock muffler front half. It looked cool but it was too small of volume to work right.(ever seen those Bud aluminum long necks?) Just put an OS 60 or TT 61 pro and go fly. mk

Reply to
MJKolodziej

On Tue, 03 Apr 2007 11:36:31 -0400, DaveH wrote in :

I would go with the 1.20 AX. I had one of the early .91 FX engines and it had a problem with the remote needle valve. I flew it on a .40-size Duraplane that weighed about 7 lbs after all the mods were done:

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It did have unlimited vertical when the engine was running well.

Marty

Reply to
Martin X. Moleski, SJ

.............snip........

Yes, that's right mk--you discussed the weight/power issues of the

20ei in my Ultimate thread. I'll scratch that one.

Do you think a 90ish 2-stroke that will fit a 60 mount would be overkill, simply unnecessary, etc.?

The SH is a heavy plane. It is interesting to note that the sheeted foam wing on my late Lanier Stinger 40 weighed more than the SH's wing. Maybe the excess mass is in the the SH's blocky fuselage. Maybe some mods....

The Stinger 40 was a dog, at least with an Enya 45. My best planes were probably a Spickler Q-500 with an OS 46FS/Mac tuned pipe, and a good old Goldberg Eagle II with a modest OS 40fp.

I put a Fox 74 on the Eagle II which worked very well, but required a brick in the tail to maintain the CG. Forgive me for going on a bit....it's all coming back to me. Dave

Reply to
DaveH

many 90s don't weigh much more than a 60, prop clearance is an issue. I have thought about it on mine. I was given a Magnum 90 and I'm not sure how it runs. Anyone know if there's a 3 blade prop for a 90 size 2cyl?

Please go on, that's why we're here.

My landing gear is very firm and short.. I bet I could save a little weight if I used some glass filled nylon landing gear and foam wheels instead of rubber. I also have a Stinger but 60 size, not built by me. It is very heavy. Due to mushy ailerons(bad servo extention) and no guts I haven't flown it yet. mk

Reply to
MJKolodziej

I had a scratch built - 60 OS - all you need.

Reply to
Dr. zara

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