Inverting a Four Stroke? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-25-2007, 04:30 PM   #11
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properly tuned engine shouldn't have fuel left over while running too "pool" in plug hole, never understood this theory

also as was pointed out to me by a more experienced modeler was to put engine into a high idle for flying and only drop to low idle for landings this can be done by simply giving a few clicks of throttle up trim and then simply remembering how many clicks were given

not sure if this helps but it can't hurt
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Old 06-25-2007, 05:01 PM   #12
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WOW! Terrific replies. Thanks so much. Guess I'll put it in inverted - but perhaps with a slight cant to one side so the muffler points between the gear. I intend to use a remote glo plug set up. Then if I need to, that's not to far from putting in an onboard glo.
Waco driver. that sounds like a good idea. Did you have to move the firewall back a little to accomodate the length of the motor? I've just framed up the two sides since I first posted this in the AM, so now is the time to adjust the firewall position if necessary?
I've been using 15% synthetic with a touch of castor in my OS 90FS and the aircraft looks like it was dipped in oil when I'm finished flying. 5% fuel sounds good, but is it good for a FS? I'd love to use less oil!
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Old 06-25-2007, 06:02 PM   #13
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Get rid of the castor.

Here is what I do. I use 15% fuel which usually has 18% oil. I mix this with equal amounts of alcohol. The result is 7 1/2% nitro and 9% oil. I have been using this in Four strokes for years.

From the Klotz Oils website.

R/C Model: 2-stroke glow engines mix at 15 -18%; 4-stroke glow engines mix at 5 -10%

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Old 06-26-2007, 08:11 AM   #14
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If you cant the engine to one side, you will have to cut the cowl to let the rocker box hang out. Installing the engine vertically inverted places the rocker box in the air scoop and requires no cutting of the cowl to let the cylinder head protrude.

I did not move the firewall back. Engine is mounted on a Great Planes mount.

My fuel is 5% nitro, 15% oil of which 5% is castor.

The supplied undercart is too stiff resulting in bouncy landings. I made up a shock absorbing U/C from automotive brake tubing and coil springs which work beautifully. email me if you want details.
MAAC 6273L
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Old 06-26-2007, 02:03 PM   #15
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Inverted straight up/down Saito 100 fs in my ryan sta-m (needed remote glow starter but there is no additional fuel pump. Works just as good upside down as right side up. Using 10% omega and there's gobs of power.
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Old 06-27-2007, 11:39 PM   #16
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4 OS 52s inverted in the B-24. Never had one quit in flight yet. It does have onboard glow, more for starting facility. It is on below 1/4 throttle. The engines will idle reliably about 500 RPM lower with it on, regardless of what I do to the low speed needle(s).
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Old 06-28-2007, 07:43 AM   #17
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Are folks who run inverted engines in their aircraft starting them upright or inverted?

Peter Merkel
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Old 06-28-2007, 08:01 AM   #18
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I start my inverted engines just like the others. A few years ago a guy taught me to plug the exhaust with one finger and open the throttle wide and turn the saito over 3 full compression strokes, remove finger from the exhaust and turn 3 full compression strokes. Repeat this 2 more times. Add the glow, put throttle back to low position and my saitos usually start with 1 or 2 flips, upright, sideways or inverted, it doesn't seem to matter.
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Old 06-28-2007, 11:08 AM   #19
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i start mine same as i would any other engine only difference is the glow starter hangs down instead of up
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Old 06-30-2007, 12:39 AM   #20
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I can vouch for WacoDriver as I have seen his Otter fly many times never missing a beat. The inverted OS52FS has no issues at all. I now own 2 of them, and have run them both. Amazing engines in my mind. The landing gear is a great piece of work as well.
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