4 STROKE Venturi Plus

Hi all
There is an article in December Aviation Modeller International
magazine showing a modified Magnum 120 FS
No bend on inlet
Interesting?
Happy landings
Vincent
Vincentzo

>Hi all
>There is an article in December Aviation Modeller
>International
>magazine showing a modified Magnum 120 FS
>No bend on inlet
>Interesting?
>Happy landings
>Vincent
>Vincentzo

And how high do you mount the tank? Does the location of the carb affect the tank height, or is it just the location of the engine?

Even in RC, you typically want the tank centered (if possible) around the needle assembly, which is why your typical 4 stroke has the long intake.

I would think that most CL applications (at least from reading this board) typically are using quite large engines, in which power loss due to the intake path really doesn't matter for the particular plane.

This would make sense if for example the engine was installed in a scale plane with a tall body and the prop at the bottom of the fuselage (or the other way). Having the tank high (low) might make access easier or preserve interior integrity, etc. but then would require a mod like this on the engine. Sometimes normal just won't work right.

Yep, problem with this is tank height. May work if you have a pump. This is the way the RCV was setup stock and I actually tried in like this in a plane. Not good.

Hmmmm..

I guess if you believe Joe Wagner (the Engine columnist in Model Aviation), the longer the venturi, the better. I don't remember what he says about the passage between the venturi and the engine, but he had a picture once where he hooked up a piece of hose that must've been 8 inches long between the carb and the engine's carb housing, and the engine ran, no problem.

I suppose sharp bends would restrict airflow, though...

Perhaps the person using that Magnum had some sort of fuel pump on board?

Speaking of Magnums.. anyone try a Magnum or ASP 4 stroke in Stunt, yet?

Isky,

My buddy, Pat Johnston, ran the ASP 61 4 Stroke for a bit. Said it ran fine with comparable power to the Saito 56. Didn't have much problem with it.

Hmm....