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Fuel foaming in tank mount - 11/28/2004 5:05 AM   
propbuster



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From: Black Mtn, NC, USA
Status: offline 		I have a TD.051 mounted on a pod with a tank mount and am getting a lot of foaming in the fuel. I'm sure this is due to the vibration of the pod. I was wondering is there any fuel additive I could use to help this or any other suggestions? Thanks

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RE: Fuel foaming in tank mount - 11/28/2004 5:21 AM   
astro-hog


 

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From: lawton, OK, USA
Status: offline 		I use foam rubber to mount the tank. wrap it up just like you do the reciever and battery. you will have some foam but it helps alot!


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RE: Fuel foaming in tank mount - 11/28/2004 6:35 PM   
propbuster



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From: Black Mtn, NC, USA
Status: offline 		Yeah that's a good idea for an in- fuselage tank, but the tank is mounted up on the pod and the motor is attached to the tank. Thanks

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RE: Fuel foaming in tank mount - 11/28/2004 6:58 PM   
flyinrog



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From: Burlington, NC, USA
Status: offline 		I have heard of people using a drop of armour all in with the fuel to stop foaming, this may however be urban legend and I have no personal experience with it myself....if its a norvel tank and you can see it foaming try turning the propwash tube sideways to slow down the pressure, or you'll have to run the engine pretty rich to keep it running through the bubbles, or if its a cox mount and just bubbles in the fuel line, it may be a tiny air leak getting vacuumed in with the fuel, just my .02...Rog

btw welcome to the carolina crew

< Message edited by flyinrog -- 11/29/2004 2:33 AM >

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RE: Fuel foaming in tank mount - 11/28/2004 8:09 PM   
tperry2054



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Status: offline 		Not urban legend it works. Just a drop in one gallon. More is not better. Shake yor fuel can 'til it foams, add a drop and notice a big difference.

Tom

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RE: Fuel foaming in tank mount - 11/28/2004 9:59 PM   
Deadstik



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Status: offline 		Propbuster,

I would certainly try the chemical fix suggested by the other guys.. but.. look for the reason you have the vibration. 98% of the time vibration in a power setup can be traced to an out of balance propeller. I know it may seem trivial to balance a 1/2A prop.. but I do it religiously! I have a little set up that uses the regular Du-Bro prop balancer mechanism but then I put that unit on two razor blades stuck thru a block of foam. Just remember to sand the FRONT of the heavy half till it balances. I had a very similar problem when I got back into 1/2 A with a Black Widow that Tim Wiltse modified to scream for me and all it took was about 3 swipes w/220 paper and no more fuel foaming. Hope this helps.

Dan

aka deadstik.......

part of the infamous Carolina Crew.......

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RE: Fuel foaming in tank mount - 11/29/2004 2:05 AM   
propbuster



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From: Black Mtn, NC, USA
Status: offline 		Thanks for the suggestions guys! I think I'll check out the prop I've been running on it first. It came off an old control line plane I had and it definatley trimmed the grass a few times !

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RE: Fuel foaming in tank mount - 11/29/2004 7:34 AM   
Johnny C!



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From: Pisgah Forest, NC, USA
Status: offline 		The Armor All does work. I have used that trick on a crashed engine. I guess
the crank was bent. I put a quart of fuel in a spray bottle instead of treating the
whole gallon. It worked great, until one day... I didn't have my special "K" fuel,
nor did I have any Armor All, so I tried some off brand Armor All type stuff.
The motor seized... I never had any problems with the real stuff.

However, the root root of the problem could be an unbalanced prop.
Try that first, then fall back on the home brew!

Good Luck!

Johnny C!

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RE: Fuel foaming in tank mount - 11/29/2004 10:20 PM   
MikeSell



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From: Flushing, MI, USA
Status: offline 		I have had the same problems with the slik-mount and the norvel mount. I decided that they just weren't worth it. Others at the field use the Armor-all fix. It reduces foaming but they shortly start getting inconsistant runs and poor transition. When the plug is replaced the engines return to their good disposition for a few runs. I don't use the additive and my plugs last for years. I have over 14 air hours beyond break-in on some of mine. Other ask me to tune theirs to get the same consistant runs. I can't do it with their fuel.
These results lead me to believe that the Armor-all is leaving a coating on the plug element much a WD-40 does. These products are not designed to be used as fuel or in fuel. Plugs for these engines are not cheap but consistant runs and problem free use are even more important.

< Message edited by MikeSell -- 11/29/2004 10:22 PM >

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RE: Fuel foaming in tank mount - 11/29/2004 10:31 PM   
us020140



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From: Grand Rapids, MI, USA
Status: offline 		You will have a lot more fun with your .051 if you use a real tank in the fuse. The tank mount almost guarantees misery.

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RE: Fuel foaming in tank mount - 11/30/2004 4:13 AM   
ptulmer



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From: Brunswick, GA, USA
Status: offline 		Don't know much about other mounts, but the Norvel mount doesn't cause alot of foaming. No problems at all. I do balance my blades very carefully. Take a piece of 1/8 music wire, stick it in a drill and touch the end to a running grinder. Reverse and repeat. All you need now is a couple of magnets. I stick them to a desk drawer and to the desk. Drawer pulled out of course. Make sure the A/C or Heat isn't blowing. Stick the prop on the music wire and put the wire between the magnets. The wire should only be touching one magnet. This is an incredibly accurate way to balance the blades and the magnets can be found in McDonald's toys sometimes.

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RE: Fuel foaming in tank mount - 11/30/2004 4:48 AM   
Johnny C!



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Status: offline 		Pt,
I understand the importance of a well balanced
prop. I think the Norvels, and maybe all 1/2a engines,
turn such high RPMs, that any im-balance has an exaggerated
effect on the tank, due to the relatively small mass of the
engine.
I have had no problems from my Norvel, since I began
balancing my props, & therefore stopped using Armor-All.

I really like your home made prop balancer.

Thanks,

Johnny C!

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RE: Fuel foaming in tank mount - 11/30/2004 5:52 AM   
ptulmer



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Status: offline 		Hey,...I'm cheap!

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RE: Fuel foaming in tank mount - 11/30/2004 5:13 PM   
Johnny C!



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From: Pisgah Forest, NC, USA
Status: offline 		yea, me too...

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RE: Fuel foaming in tank mount - 12/6/2004 2:01 AM   
propbuster



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From: Black Mtn, NC, USA
Status: offline 		Well, changed the prop and saw a big difference in the foaming action. I still had a little but not enough to affect the engine's performance. Thanks for the ideas guys, and I'm going to make a prop balancer too.

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RE: Fuel foaming in tank mount - 12/6/2004 3:54 AM   
Japanman


 

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From: Tsu, JAPAN
Status: offline 		I can`t comment about cox 051`S, but I had a lot of problems with my norvel .061 vibrating if taken too much above 20K- and even below it seemed to vibrate. I have just recently found that it is not so much the prop at fault but the crankshaft balance ratio. I took a gamble and started to grind into mine after I found thet the engine vibrated less with the piston much lightened. After grinding a small amount off the crank the difference is amazing- it nolonger has the tendency to want to shake the carb loose (so often talked about here with norvels)

Stefan

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