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

fuel foaming

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Old 10-11-2002, 08:07 PM
  #1  
jlong34016
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Default fuel foaming

Anyone having trouble with fuel foaming on the whiplash? Not that there is anything wrong with the whiplash but without padding i am getting lots of bubbles. If anyone has a bubbless bladder tank they have found to fit i would like to know where to get one. Thanks.
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Old 10-11-2002, 09:10 PM
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daven
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Default fuel foaming

check the tanks at www.jettengineering.com

Not sure about the fit on the whiplash, but they work very well with these types of engines.
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Old 10-12-2002, 12:14 AM
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jrplane
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Default foam!!!!

I have the same problem, so I added 3 or 4 drops of armorall to a gallon of fuel. this will stop most of the foaming. I believe its the silicon in the stuff that works,, Jeff
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Old 10-12-2002, 02:31 AM
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flyboy_1963
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Default Tettra Tank

The Jett bubbless tanks will not fit in the Whiplash. I purchased the 6oz Jett tank and it won't work. Tettra makes a few different sizes and they look more like the shape of the Whiplash tank area. Take a measurement and go to the Tettra website and see if one will fit.

Good luck.

JJ
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Old 10-12-2002, 05:07 PM
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Glorfindel
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Default fuel foaming

You can try another solution. Put a clunk with porosity in it instead of a hole. I will try it myself, 'cause i have the same prob. It's not an antifoaming, but it will suck only fuel not air (that's what an old rc flier told me today ) Anyway i will give it a try before changing tank setup or the tank itself
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Old 10-12-2002, 07:53 PM
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jlong34016
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Default armorall

worked great. no air in line at all. every tank empty.
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Old 10-12-2002, 10:05 PM
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Glorfindel
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Default fuel foaming

I dont wanna be mean but are u telling me that the Armorall thing work???
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Old 10-12-2002, 11:41 PM
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Default clunk

I found that using a felt clunk or wrapping the clunk in foam works pretty well too, but I never heard of armour-all, thats a new one on me, I guess dont knock it till you try it???
Mr. Long 163 on the Q, thats not anything to bark at but as Dan said, you can get much more out of that engine and the whiplash with a little bigger prop, I have a 9/7 on my Jett50 and 200+ is the norm..
give it a shot I think you'll be surprised//
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Old 10-13-2002, 12:06 AM
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jlong34016
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Default armorall

Yep three drops in 3/4 gallon and nothing but pure fuel in the line. Same engine,prop,fuel,holder as last week. Last week i could see tons of air going in and the engine would surge. Today steady as a rock not one single bubble in the line. Im a believer.

Takeoff today was better. Straight as an arrow for 25 feet then sank. Only thing that saved me was we launch from on top of a rise and have about 10 foot drop to the weeds. Cut the grass with the blade. Im sure this is due to the thrust issue with the small prop.

Im still skeptical about 200 mph with a 7 inch pitch but i'll try anything, heck i may even armorall the exterior of the plane to make it even more slippery.

BTW does anybody think the armorall may cause a problem with anything?
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Old 10-13-2002, 12:22 AM
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Glorfindel
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Default fuel foaming

That's my point...Even if i had some foaming prob, and you saying to me that armorall do the job(i belive you) i'm not sure about what the product is doing to my 450$ (canadian found) engine...
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Old 10-13-2002, 12:39 AM
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Glorfindel
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Default fuel foaming

Bagotstix...


I waana know how many rpm you jett 50 turn a 9x7 prop...theoricly you should turn it at 30000rpm to get 200mph...We both know that a Jett .50 will not turn it on static more than about 19000....


I did the 3th flight on my Whiplahs today. It turn a 8.75x9w 19200 static. Everyting goes well with my new elvevon setup. The whip flew flawlesly! (thx to you ) Maybe it unloaded to lets say 22500( wich is pretty munch i think) that make me a theorical speed of 190mph and i think it's a 'i wish it goes to that speed than it realy is' so going at 200mph with a 9x7......
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Old 10-13-2002, 12:51 AM
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jlong34016
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Default elevon setup

Care to share the new elevon setup with us? Thanks.
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Old 10-13-2002, 02:55 AM
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Glorfindel
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Default fuel foaming

First setup : long servos arms with rod almost 90 deg. Now shorter servos arm with rod at angle with 4-40 screw trough elevon as control horn( like i usualy did on any of my pattern or 33% H9 cap)...Like i said to whiplash maker, we use whiplash to do very fast pass, so 98% of the time we 'pull' on the rod (no pushing) so we NEVER brake a 4-40 rod pulling on it, almost impossible, i dont nedd cf rod to do that....Can send you a pics of it just ask....
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Old 10-13-2002, 11:33 AM
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rc_steve
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Default fuel foaming

Originally posted by Glorfindel
Can send you a pics of it just ask....
I'd like to see this picture. I've got an image in my mind, but I'd like to see what you have done.
Post it here if you could.
-Steve
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Old 10-13-2002, 02:56 PM
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Glorfindel
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Default fuel foaming

Give me your email, cant post here pics too large and i dont have a software to minimize them
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Old 10-13-2002, 03:06 PM
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Jeff Leavitt
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Default Armor All Experience

Hi Guy's,

Like you, I was dubious that the Armor All would work without causing some other problems down stream. probably started using it three years ago in Quickee 500's. It worked flawlessly. Have been using it in my 1/2a pylon racers for the same three years now with no problems whatsoever. I have heard some folks speculate on what the problems might be, but have never heard of an experienced user having trouble with it. Me included. I use fuel in quarts for the 1/2a stuff these days and I add two drops per quart, I could probably get by with one drop, but if it works, don't change it, works for me. Try it, you'll like it.....

Jeff ......
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Old 10-13-2002, 03:22 PM
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Glorfindel
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Default fuel foaming

I will try it, but can you quantify the '1 or 2 drop' ? Idont want to put more than needed
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Old 10-13-2002, 03:26 PM
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Default plus

Theres a plus side to using armour all in your fuel it seems, it reduces bubbling and also gives your plane a nice shiney finish as it cleans and protects , .. :stupid: that sounded like a commercial for Armour All. :stupid:
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Old 10-13-2002, 04:00 PM
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Default fuel foaming

LMAO Rick!!!!!!
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Old 10-13-2002, 09:14 PM
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BAGOSTIX
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Default ..

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Old 10-14-2002, 12:29 AM
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Jeff Leavitt
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Default Fuel Tip....

Nice touch of humor there Rick...... If there was something that we could add to the fuel to keep the oil off the airframe that would be a hot item....

Glorf:

I can tell you without reservation that two drops per quart will work flawlessly. I don't think that the drop count is that critical. Try this test yourself. Take a quart of fuel 3/4 full and shake it good. You will most likely get a head of bubbles about an inch tall. Add the Armor All and shake it again. Almost no bubbles...
I've only had fuel from one mfg. that added an effective anti foaming agent. One other fuel tip. Strain all fuel through a coffee filter. Even new bottles. You will be amazed at the stuff you'll catch. All of this junk will affect your needle settings and generally make you crazy wondering whats wrong... And, it will change from run to run. There's a lot of teeny plastic thingy's that must come from the fuel jugs. Not to mention other trash...
Rgds, Jeff.....
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Old 04-30-2003, 08:25 PM
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Crazy4Flight
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Default tank

i put an RST-6 in place of the slant nose tank.
used faom to line the tank well and used linoleum for a strap to hold it in for right now
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Old 05-01-2003, 11:04 AM
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JeffH
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Default foam

I had terrible bubbles, not foam, in my tank at high throttle settings. The Armor All did not help since I did not have foam to begin with. What fixed it was, I glued a piece of 1/4" foam to the tank floor, then glued the tank to the foam using Goop. It is stuck very well, and best of all, no more bubbles.
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