I neeed a 1.5 ounce/44.4cc wedge tank

I've never seen that style of tank before, I don't read/use/order from Tower.
I like it, its design makes sense and should work well for R/C as well as U/C aplications.

I usually buy the see-thru Sullivans, as they are heat gun moldable and much easier to build and see the fuel level.

I must need something different. My great bladder design ain't working today. Hundreds of flips and a handful of 30 second runs. Now I'm mad. I have one hour of sunlight and both of my BWs are acting up, so it'll probably be another week before I can fly. Don't we have a MAD smiley!(*&%&(^$%(*&^$*RTF JHBO*&Y& Y(P* B{*()U {*(Y OGYF&^%(%^)O &P)&)(&_B*+*(N+)_*(}_)(|}_)(}_OM O:JYP(*Y P&(*YIUHILUH P(*&Y P(*Y{(*UP(*(*P!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Rusty,

Are you willing to try pressurizing you tank from the crank case? I know many people have frowned upon this but it has been my experience that this is both simple and completely dependable once you learn how.

Bob

fit90 wrote:Rusty,

Are you willing to try pressurizing you tank from the crank case? I know many people have frowned upon this but it has been my experience that this is both simple and completely dependable once you learn how.

Bob

Hi Bob. I really really hope to avoid a pressure bladder, but something has got to work better. I can crank it much easier on the stand with a tiny Perfect wedge I have. I think that would work okay, but not perfectly since I can't mount it at the best position. But with the bladder I can't crank it in less than a hundred flips. I was hoping a bigger vented wedge tank or one of those bullet tanks with a clunk and a vent would be a helpful option. But your suggestion of crankcase pressure interests me.

I am really good with engines, large and small, I understand them intimately, but this one is making me feel like an idiot. And I know it's a good engine, I've seen what it can do when I can crank it. What do you have in mind? A wedge or a bullet with a pressure line? Remember this is C/L so I'm constantly inverted, looping, etc.

While I await your answer, I'm going to get a BW running so I can at least have 1:45 minutes of fun with the Li'l Satan or the Jumpin Bean... next freakin' weekend I want to put the Medallion on one of them, but that will turn into a project instead of a quick addition. Next kit is going to be a beam mount to make mounting external tanks easier.

So tell me what you have in mind,

Thanks,
Rusty

Rusty,

I'll send you up a backplate with a pressure tap. Put this one on the Tee Dee in place of your regular backplate. Make sure you have the fine thread needle valve on the engine. You can use any fuel tank with two lines. Since I fly R/C I use one ounce tanks and have a clunked pick up line going to the venturi and hook the pressure tap up to the vent line. For starting I usually open the needle valve about two turns and begin cranking. I prefer to have the needle a little lean and richen it up until the engine lights off. If the engine fires but does not light off I usually remove the pressure line and start again. The first few times are terribly frustrating but when you get it going it becomes easy and dependable. Just remember that the tank has pressure on it so it floods easily.

Tell me what you think.

Bob

fit90 wrote:Rusty,

I'll send you up a backplate with a pressure tap. Put this one on the Tee Dee in place of your regular backplate. Make sure you have the fine thread needle valve on the engine. You can use any fuel tank with two lines. Since I fly R/C I use one ounce tanks and have a clunked pick up line going to the venturi and hook the pressure tap up to the vent line. For starting I usually open the needle valve about two turns and begin cranking. I prefer to have the needle a little lean and richen it up until the engine lights off. If the engine fires but does not light off I usually remove the pressure line and start again. The first few times are terribly frustrating but when you get it going it becomes easy and dependable. Just remember that the tank has pressure on it so it floods easily.

Tell me what you think.

Bob

Okay, I'll try that. Would a wedgie be considered a two line tank if I just plug one of the vents? They have a pickup line that runs to the back corner of the wedge and two fill tubes configured like a Bee stunt tank. I can just plug the bottom vent and run pressure to the top vent. Or I might try one of those bullet tanks with a clunk and fit the stopper with two lines.

I was reading the RCU thread you posted a link to a while ago and someone recommended a bladder like I've been tinkering with for Bees. That might work for the Medallion. I'm pitting it on the Jumpin Bean. Unfortunately the Li'l Satan has nowhere to mount a bladder or wedge without going into the rib bays. I'm not ready to ugly it up yet.

ORIGINAL: danilo-2

As an alternate to adding pressure.. at least as an intermediate step.
Use a Balloon tank. Just fit a simple plain balloon with a fuel line and clunk in it.
No bladder pressure needed, mount it in an old 35mm film can.. if you can find one :-)
This gives a very consistent fuel supply, regardless of the model's orientation.