Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Upright Motor on Outlaw?


Old 10-15-2014, 01:29 PM
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Default Upright Motor on Outlaw?

I am drawing up an updated Outlaw to use carbon tubes for spars and simplify the construction methods. I know the horizontal motor configuration keeps the carb level with the center of the tank, but how critical is that on this model? There are many deltas that use upright motors and don't seem to have any fueling issues, even when doing pretty severe aerobatics and high speed turns. The upright motor simplifies a number of things and keeps the needle valve and carb off the dirt during belly landings. The motor I will be using is a Thunder Tiger 36Pro with a Jett tuned muffler if that matters to anyone. I can easily get the center of the tank less than 1" below the spray bar in the carb if I raise the tank a bit off the wing centerline and use a low hatch to cover it.

A second part to the question is how would the flight characteristics (mostly the stupid violent aerobatic maneuvers the Outlaw is known for) be affected with a cowl around an upright motor and a low hatch over the fuel tank and radio compartment, similar to the Screamin Demon?

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Old 10-15-2014, 03:10 PM
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I've never had a working rudder on this type of delta, but I'll bet there are certain maneuvers that could starve the engine if you did them with enough G Force.
The guy who developed the Outlaw might have experienced this...or else he just wanted his delta to have a distinctive look. I can only speculate.
Hard outside loops will make a starboard side mounted combat engines go lean and hard consecutive inside loops will make the engine go rich.
I've never noticed what happens when the cylinder is laying to the port side.
Decreasing prop load makes the engine less sensitive to this evil juju.
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Old 11-06-2014, 10:11 PM
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I've built a couple and it's already pretty simple. I did see one built with an upright engine and it flew fine.

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