I'm building a Midwest Starduster (almost the same as a Four Star) and I'm installing an ASP .65 four stroke. Anyone inverted their 4 stroke on a Four Star?
Since the thrust line is rather high on the fuse, I though I'd invert the engine and cap off the top of the engine bay to clean it up a little and make it a little different to boot.
If someones done this I'd like to see a picture. Also were you able to get the tank low enough to not use a regulator?

I have a saito 40 inverted on a 4* 40 and am very pleased with the way it runs. I did cut the formers down and put tank at bottom of fus. I am doing a 4* 60 with a saito 100 inverted and plan to make a cowel simmilar to a curtis P40 Warhawk on this one. I do not have a way to send any photos, sorry.

I think I would be concerned with the head being scuffed during a nose over during landing, take off, or ground handling. Other than that go for it. It will look neat and 4 strokes sound so good.

ciao -rjf

I started with a new Magnum 52 4 stroke on my 4*. Built a custom cowl, but could never get a good idle. It may have been my inability to tune combined with a fresh engine. I sold that and installed a ST51 sideways, ran great. Mounted the ST51 inverted, ran great, idled for minutes with instant transition. Tired of the ST muffler drama and installed an inverted TT46. Couldn't get a reliable idle, mounted it sideways with a pitts muffler. Ran much better untill it ate the carb barrel spring. Tried a fresh Saito 45 inverted, but couldn't get a reliable idle. Mounted the Saito sideways and now have a few hours on it and it is getting real sweet. I may invert it at some time again just to experiment.
I had a Saito 65 inverted on a short lived Venus. It was the only engine I could get to run inverted with the tank mounted up high. Tried a TT46 and Webra61 as well.
I read on here about so many people who never have problems running inverted. I don't seem to have the Midas touch, but I haven't given up yet.

Good luck, MikeB

I've seen an ASP 65 fly a very heavy stick plane. It is a great engine.

Well I did it. What do you think?

Another view.

Last one...

I amabout to install a satio 150 inverted on my spacewalker ..I worry about fuel in the head sitting but I am told just install a remote ignitor and problem is solved.or you can do noting and you can even install a pump$$$..someone even suggested just offsetting the invertyed engine 5 or 10 degrees.I suspect I am worrying over nothing but all these years I have avoided inverted engines but am plunging into it now.

Congrats on picking the four star as your next "kit bash". A number of folks have done mods very similar to what you're planning. Take a look at what Mr70ss did with his Four Star.

http://www.rcuniverse.com/forum/m_25...tm.htm#2518616

Mr70ss was also kind enough to email me copies of his build process pictures.

Good luck with your kit and don't forget to snap some picts during the build. I know I can't wait to get started on mine - it should arrive at my LHS this weekend!

We are running an inverted OS 120 SIII pump in a RCM Krier Kraft, we started initially using 5% Nitro 18%synthetic oil, it ran but not great idle, added onboard glow which helped, then went to 10% nitro and it idles great and picks up fine throttles well and has unlimited vertical, does great snaps etc.

That looks really nice! Well executed bash.

somegeek