TD .09 with MVVS throttle and custom made muffler

[GermanBeez]

aww, why do you castrate your TD like that? it has to breathe freely, without restrictions through rc throttles and mufflers...it's like a bird in a cage...

[hopeso]

@GermanBeez Well, because I fly RC. RC means radio CONTROL. Imagine if your Airbus had two settings, WFO and dead stick.

What you propose goes back to WW1 where the Sopwiths and Fokkers had no throttles. It was hell bent for leather or switch off to land. They controlled their descent by switching, or pulsing the engine, on and off. They got pretty good at it but we have glow engines that don't allow for that sort of thing.

Search for, Diesel Norvel .074 pulling my MiniSport

[GermanBeez]

@hopeso lol ok, point taken. i was just thinking that this engine was also commonly used in c/l flying, and if there wasnt a special third line attached for throttle control, it would also be flown at full blow until it was out of fuel.

[valic000]

Very interesting testings and theories..I suscribe to your channel.Thanks for clips!

[proanti1]

that is a cox .09, nearly all of them are torottled, and if they are not... you can use a norvel big mig .09 carb. there no no "exhaust port", there are 2 slits on either side. you can get exhaust sleves that already have the throttle system attached if you were to go that route. i custom made a sleeve out of brass on my lathe for an .010 and soldered a small brass tube on it that directed the exhaust through a little servo actuated brass ball valve inside the plane, then exhausted out the back.

[crookedtool]

I don't know exactly what the exhaust port looks like on there, but I assume its just a little hole. My idea is to just fit the metal tube/valve directly to the hole and use JB Weld to hold it in place. Wouldn't that work about the same? I'm only interested in controlling the throttle.

[crookedtool]

Oh, I see now. Two slots on the sides.. that's tough. What about an air intake valve? Would that control the throttle as well as an exhaust throttle?

[crookedtool]

Nice job, it sounds like it has nice response. Is there any easy way to add a throttle to an engine like this? Such as a short tube w/ ball valve attached to the exhaust port with JB Weld.

Any suggestions?

[hopeso]

Yes, that's a good idea to try. Most Cox engines respond well to exhaust throttling and your idea is superior to an exhaust sleeve as is commonly used.

[hopeso]

How to do that, however, calls for some machine tools. A lathe is required to make the exhaust collector/muffler header. From there, you put your ball or rotary valve at the muffler's outlet.

The issue there, though, is that you can't use muffler pressure to the tank. If you did, at idle, fuel delivery to the engine would be excessive.

[saffronwales]

you engine shouldn't be that hot, should it?

[dbari21137]

Hello, I was curious, what size MVVS carb are you using? How are you attaching the carb to the Cox? Did you cut threads into the barrel of the carb.

[Beej336]

u r going to crack ur engine if u take something really cold (I.E. an ice cube) and put it on ur hot engine

[sheldonholy]

yeah, dont u know about metal fetigue

[toooberoot]

i meant .049 in the fist sentence and the grammar Nazis will probably tear me a new ass

[toooberoot]

good lord , it's the big brother to famous Cox .040ci engine that used to be in those plastic control line airplane kits, you know in a cirlcle, with the string attached to a lever which is thereby attached to the elevator in the plane. specifically it's called "control line"

back to the engine, they made an .049 , and .051 i had an .074 ''queen bee'' it never really ran well, though it was a rear induction reed-valve type like the .049's

wanna talk shop? pmme

[redneckframe1991]

ive got one of those planes it is in storage and i never took it out of the box.

[wewillruleagain]

can't anyone spell?

[soddy666]

its an rc plain engin

[billbom]

its a plane engien lol