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Author Topic: Inverted Saitos  (Read 1064 times)
Douglas Ames
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« on: May 13, 2011, 02:17:30 AM »

What are the oiling issues and any fuel feed problems with an inverted Saito .40?
I have Brodak's new Corsair which is an inverted engine installation. I don't want to disrupt the verticle CG by mounting the engine upright and a sidewinder config. would require redesign of the firewall/ mount, however I do like Bob Reeve's configurations of his Saitos.
Do you think I would need to drill small bleed holes in the rocker covers for drainage? I would think they would act as sumps over time. This is a future winter project.
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Robert Zambelli
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« Reply #1 on: May 13, 2011, 06:00:41 AM »

Doug - I have run SAITO engines in every configuration with no modifications and no problems. In general, they seem to run best side-mounted.

Bob Z.
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Bob Reeves
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« Reply #2 on: May 13, 2011, 08:35:26 AM »

Haven't actually looked at a kit but from the photo it would be fairly easy to change it to a side mount. Depending on how it's designed I would either replace the hardwood engine bearers with hard balsa and cut them off at the front of the firewall or eliminate them altogether. If the firewall is 1/8 plywood, make a duplicate to end up with a 1/4 inch thick firewall and use an RC engine mount turned on it's side. Is the cowl built up from balsa or a preformed part with a cutout for the engine already cut. In either case it wouldn't be too difficult to get the cutout in the right place.

That is what I would do simply because I am completely convinced they do run better side mounted and feel it's worth the trouble, however many have ran 4 strokes inverted and seem to be happy. You just have to make a decision, is it worth the trouble for you?

I wouldn't worry about the vert CG nor would I even think about modifying anything on the Saito but the intake..

I do think the Saito 40 is an excellent choice for that airplane..
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proparc
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« Reply #3 on: May 14, 2011, 04:46:24 PM »

Just remember, the carb is reverse from a 2 stroke so, it is easier to flood it. As to the actual run characteristic, no difference-a zillion RC Saitos will attest to that.
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Milton "Proparc" Graham
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« Reply #4 on: May 19, 2011, 02:36:06 AM »

They all run em inverted in Aus . 56s , 72s , etc .

Turn through backwards to clear wet cylinder to avoid hydraylic lock .
I think Berringer used to lube the cam gar set preflight ?
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Chris Wilson
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« Reply #5 on: May 19, 2011, 06:07:04 PM »

I have Brodak's new Corsair which is an inverted engine installation. I don't want to disrupt the verticle CG by mounting the engine upright and a sidewinder config. would require redesign of the firewall/ mount, however I do like Bob Reeve's configurations of his Saitos.

It would seem that the prototype was indeed using a side  mounted engine in a profile fuselage so it can't be that bad to do the same with a four stroke.

http://webcache.googleusercontent.com/search?q=cache:Yr0EoUPbH5oJ:stunthanger.com/smf/index.php%3Ftopic%3D5267.0+/search%3Fhl%3Den%26site%3Dwebhp%26q%3D%2Bsite:stunthanger.com%2BBrodak%2527s%2B%2BCorsair&cd=1&hl=en&ct=clnk&source=www.google.com
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