Do whatever you like, I have many many more flights on EFI equipped planes than the average modeler on the order of one to two new gas engine planes per month. I dont have RFI issues.

Matt, those are no more misleading than telling people that all stopper installations leak. This "stopper" type install has been around forever, and admittedly can be a source of trouble. This doesn't necessarily mean it's a complete junk design, it just suggests you need to pay attention to what you're doing! With gas, and the number of issues apparent among rookies getting used to gas, you could say the same thing about every fuel line connection?

Myself, I find somebody that's selling materials to those having trouble with the stopper type installs, maybe somewhat less than objective? I fully support the fact you are supplying an option, but condemning the stopper type installs completely might be a bit over the top..... -Al

Moses was a grade behind me in high school.
Considered this: Your buddy is transmitting on the same 2.4GHZ frequencies you do and it don't interfere with you. Why is that? Your buddy don't have the same code as yours so your receiver rejects it. Why do you think the spark could get and remember the code? When the spark occurs it probably wipes out the band, but there is plenty of time between sparks to get the info in.
That said there are other items on the A/C that the spark could interfere with. The problem is less serious,though,as they dont have near the sensitivity that a 72mhz receiver does.

That was awesome!

I use a 3 line system, I do not like The "T" method. Personal preference.

So funny how this topic always turns into an argument! I never said they "ALL" fail. But they can and do. It only has to happen once for it to be a serious problem. And it is not because the install was poor or done incorrectly. For gasoline, it is an inferior system, with a known failure point. If it works for you great. We have a new person to gasoline asking for tips. My tips atr not directed at those that want an argument. The beginners can heed the advice of the experienced or not. Their choice. I have seen long time IMAC guys at the field recently have stopper problems. Almost nobody at our club that I know of use them anymore. Like I said, we have Ethanol in our gas. You would not use a Gas stopper in a glow fuel set up would you? Well, that is what is going on in my state. Lucky you, that you have better gas than we do. My solution- screw on cap tanks. A much better system. A word to the wise should be sufficient.

RFI is almost always a plug cap issue these days, with 2.4. That is the first place to look if you are having trouble.

VG, I think Al means well and I don't take offense at his words. However, I too believe the built-in lip seal of caps in the bottles I discussed earlier are simpler and better. Some opt to use aluminum screw on caps and that's fine with me. It's just that they are expensive at about 25$ a piece.

For the novices in the group, glow stoppers worked fairly well. The rubber is silicone and tends to be softer and more compliant than the rubber (usually neoprene) used in gas stoppers. Neoprene tends to be harder and less compliant than silicone. Add their apparent variable size (the one I wrote about was just too small) and it spelled trouble for me. Had to screw the thing together to much higher pressure than should have been required and it eventually split the rubber.

It's no biggie either way. And no skin off my nose either way. I offer a good solution to all for both tanks and gas lines that is both inexpensive and robust. And trust me when I say none of the few of us that offer these simpler and robust solutions are getting rich off them. Nuff said? Nah, who am I kidding. This thread will last another 10 pages.

Personal preference is what makes it so interesting. You can have a multitude of ways to accomplish the same end. When you run into something out of the ordinary for you someone has already found another way to work around your problem. To many have the idea theirs is the only way to do something. I myself have a few with three lines and they work every bit as good as any other.

Dennis

My concern does not lay with the "wise", it's to the uninitiated. And I think it safe to say those of us with ethanol in our gas are in the majority - and have been for years.

I have only used stopper tanks in my glow set ups for around 34 years. Worked great for them. Gas tends to be a different beast than glow.

Dennis - I'm using your msg as a reference here - NOT directed TO you - but it supports the point I was attempting to make in my feeble effort about stoppers. Generally, "gas" stoppers work, and pretty well for a good long time, They aren't made to last forever. Problem is, you buy a SULLIVAN tank, the stopper is RED, then it's for GLOW. Buy a DuBro tank, the stopper is BLACK, then it's for GLOW.
So, Newbie or Not Newbie, we buy the "after market" stopper that is correct for gas - Sullivan is BLACK, Dubro is RED. They work just DANDY.
Problem is once installed, you can't tell by looking whether it's a Dubro or Sullivan stopper in the tank of that Gasser you just bought.
Or, you may be a bit like me, and can't remember...Did I use a Dubro or a Sullivan on that last ARF ???

My point, and again - not directed at you Dennis, or anyone else - is that something as simple as a tank stopper setup is "something" that the person who is new to gas has to learn about. Just like having to learn about why that yellow Tygon gas line is to be avoided, or not used altogether because of various shortcomings in different types of gas fuel line setups.

There is a LOT of "Stuff to Know" for anyone coming into GAS powered engines from Nitro....

Also, not to mention, if you are NEW, then you have to buy a tank. May as well just buy a Fortitude or any of the other pre built Fiji style offerings and be done with it. Then there is just no fuss at all.

The only fuel tubing I can find in the hobby shop i Tygon yellow. What do you use and where do you get it?

I haven't purchased my fuel tank yet, but I want a 4titude or wrongway rc Figi bottle. I haven't found anyone that has a 4titude tank of 12 oz. in stock. Only 8 oz, which I think may be too small. Wrongway rc has a 2 line 11+ oz. and a 3 line 16 0z tank. I was thinking I would prefer the 3 line system, but 16 oz seems like that may be a lot of fuel for a 20 cc gas engine. I'm sure there is no issue in the size, because the Four Star 120 manual recommendes a 16-20 oz tank. Does anyone have an opinion on this matter. Also as far as gas is concerned, I have a gas station near my home that sells non ethonal higher octane premium gas. This is all I ever use on all my small engines. Chain saws, garden tractors, lawn mowers & more. I plan on using this also for VVRC engine. I assume this will be fine.

Lamar

MTK (on this thread) sells a version of gas tubing that is absolutely the very best that I've used, ever, and that was after years of buying more expensive black Viton tubing. Matt's stays far more flexible, is clear so you can see the fluid in there, and is just "best", but that's my opinion after many, many years of trying everything that came my way for gasline tubing.

http://www.mcmaster.com/?orderview=n...19/134/=xf870h

I think you'll find that the 11oz will allow you plenty of flight time.

I use a 16 oz. on my 20cc.

16 oz. for a 20cc? With that much fuel for a 20cc, I'd probably need to land to drain a different tank before I ran outa gas, just saying
Running a 14 oz. Dubro in my new YAK with a DLE20 RA.
Pete

That's right. I generally use about half of it. 15-20 in flights. I fly at a lot of warbird events, and I have found I do not want to be short of fuel, as there is a lot of traffic on the flight line.

Most if not all airplanes in this size range were designed to take a tank of this size. If you were running a .90 sized glow, you would have a 16 oz. in there.

Tygon is found in most autoparts stores and small engine shops, all the same stuff. Many sizes so take an example if possible!

I use a ring made from aluminum around the neck of fuel tank. Use a Dubro stopper for gas & tighten the screw good. The ring will prevent the tank neck from splitting. Been working 3 years now. Capt,n

Lamar, the non-ethanol gas is fine in the VVRC engine. I use avgas in all of my gas engines which is also non-ethanol material, and it works great in the VVRC 40 twin.

On gas tanks, you can build your own from a Fiji water bottle. They come in 330cc (about 11ozs), 500 cc (about 17 ozs) and 1000cc (about 33 oz.). If you need fittings and gas line, I carry both. Contact me directly.

Regards to size, I use the 330cc for my 30-40 cc engines. I tend to run at 2/3rds throttle in my flying so the 330 cc tank last about 20 minutes. I recently got the OS 15 cc and I use an 8.5 oz (250cc) Dasani water bottle (round) which lasts about 12 minutes at WOT.

I use http://pure-gas.org/ fuel in all my small engines & in the fall it makes a good storage fuel. Try it you will see. Capt,n