Inverted, Sideways Engines ??? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-03-2011, 06:06 PM   #1
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Inverted, Sideways Engines ???

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Hi there,

Can anyone suggest why some of the planes have engines installed as inverted or sideways ? What good can it bring in doing so ? If it is only for style-sake then can I reinstall them upright ? Not have much experience about them but I find them hard to start. Any tips about starting em ?

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Old 12-03-2011, 06:20 PM   #2
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Re: Inverted, Sideways Engines ???

Normally the orientation of the motor is partially dictated by the airframe and cowl design as well as looks. A vertical or side mount install presents the least issues in regards to fuel siphoning and general engine tuning. Most warbirds due to minimal cowl cutting require inverted install which looks great but does pose some engine running issues. On my fourstroke inverted installs i used a cline regulator to prevent siphoning and i never had any issues running the engines or worried about the orientation of the fuel tank to the needle valve.
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Old 12-03-2011, 08:58 PM   #3
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Re: Inverted, Sideways Engines ???

They run fine in any orientation with due consideration for proper tank height. Difference being, do you really want a garbage can sized head sticking out of the top of the cowl on a nice scale or semi-scale plane?

Performance orientated disciplines tuck them inside the cowl to reduce drag.

For beginners & most sport flying, leave it upright, more convenient to work with.
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Old 12-03-2011, 11:30 PM   #4
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Re: Inverted, Sideways Engines ???

My old Pattern ship had an inverted mounted 2 stroke, Pumped Webra 61, with pipe, always had to start it inverted. Worked fine after it was running never could start it right side up. Hated flipping over a running airplane.
4 strokes are a little easier to start inverted, but harder starting then upright.
(oils tend to settle on the glow plug, causing the glow plug to drown out)
I hate inverted mounted Nitro engines, own several birds that way, and once they are toast, won't do it again. Sidemount nitro is the way to go. Easier starting, easier to get carb center line with tank location.

Gas.. 2 stroke doesn't have that problem, been a plus to the 2 stroke design.
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Old 12-04-2011, 10:11 AM   #5
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Re: Inverted, Sideways Engines ???

If you you don't like the looks of an upside down engine you could just fly your plane inverted a lot.

I mounted my 91 surpass sideways so I could learn knife edge too.
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Old 12-06-2011, 02:37 PM   #6
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Re: Inverted, Sideways Engines ???

With a two-cycle glow engine, the orientation of the cylinder should not make any difference in its performance. The only issue people sometimes raise is the possibility that fuel will somehow make its way into the cylinder head and flood the glow plug for starting. This really shouldn't happen if the venturi is facing the ground. The fuel, if it somehow gets to the engine from the tank, should empty on the ground. For example, models built for controlline stunt (in which quick starting is essential) almost always have inverted engines.
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