Fuel/Water, Bearing/Rust--More Action

[george kennie]

Miniature Aircraft, (the helicopter people) makes a clunk that does not appear
to be brass, but I don't know if it's stainless. This thing has a very long
taper to the pick-up orifice allowing the tank to be drained allmost completely
dry, especially if you use something like a Graupner tank with the recess in the
bottom of the tank.I've used these tanks in a lot of pattern models with very
satisfactory results.The 17 ounce size is just about perfect for 2&1/2 times
thru the Masters sequence.
Georgie

Bob Pastorello wrote:

> On a whim, I just removed the MK tank from my Viper.  Alas, it hasn't seen
> any fuel in awhile, tank was empty except for just what can't be drained
> through the klunk system.
>     So I took it apart, and the first discovery was a tarnished (but not yet
> corroded) brass klunk.
>     The Second discovery was the unmistakable odor of acetic acid ON the
> klunk.  Sniff test of the tank confirmed the same smell.  A VERY small
> amount of fuel remains- I'm talking a 1/4 oz or less...and that odor was
> unmistakable.  Just like the smell from curing RTV, except not as
> pungent/strong.
>
> Theory - if all this chemistry is valid (and I don't have a clue) - the
> large amount of air in the empty tank, with whatever moisture is present in
> it, does react with the exposed klunk material and the remaining fuel
> (methanol/nitro/oil) that was in the back of the tank.
>     At least it sure did smell like acetic acid and NOT "nitro"....as far as
> I know Ritches' Brew doesn't include acetic acid in it's additives.
>
> Interesting stuff.  So I installed a new, undamaged, shiny plated
> klunk....we'll see...
>
> Bob Pastorello, Oklahoma
> NSRCA 199, AMA 46373
> rcaerobob at cox.net
> www.rcaerobats.net
>
>   ----- Original Message -----
>   From: Rcmaster199 at aol.com
>   To: discussion at nsrca.org
>   Sent: Saturday, December 06, 2003 1:19 PM
>   Subject: Fuel/Water, Bearing/Rust--More Action
>
>   Joe Wagner, similar to Clarence Lee of RCM, has given sage advice over the
> years.For what its worth, I unwittingly used aluminum tubing in my Webra
> set-up from the start since that's all I had at the time. It's been almost
> 400 flights so far and the bearings still feel like new. It may be
> coincidence since the webra has larger bearings than the OS and Joe could be
> mistaken, but it's easy to test the proposed concept.
>
>   I intend to use the information he passed on more completely, and see for
> myself. I urge others to do the same covering all engine flavors. I will use
> teflon or aluminum tubing everywhere possible , and use a teflon block as
> clunk. Can't replace the brass spray bar and nipples without machining
> capability, but the other changes should reduce brass contact at least
> fourfold.
>
>   Mine will be Webra and Mintors, and since both are AAC constructed, it
> automatically eliminates a possible source of catalysis
>
>   we'll see
>
>   Matt K
>
>   Bob Pastorello, Oklahoma
>   NSRCA 199, AMA 46373
>   rcaerobob at cox.net
>   www.rcaerobats.net
>
>   ----- Original Message -----
>   From: Rcmaster199 at aol.com
>   To: discussion at nsrca.org
>   Sent: Saturday, December 06, 2003 1:19 PM
>   Subject: Fuel/Water, Bearing/Rust--More Action
>
>   Joe Wagner, similar to Clarence Lee of RCM, has given sage advice over the
> years.For what its worth, I unwittingly used aluminum tubing in my Webra
> set-up from the start since that's all I had at the time. It's been almost
> 400 flights so far and the bearings still feel like new. It may be
> coincidence since the webra has larger bearings than the OS and Joe could be
> mistaken, but it's easy to test the proposed concept.
>
>   I intend to use the information he passed on more completely, and see for
> myself. I urge others to do the same covering all engine flavors. I will use
> teflon or aluminum tubing everywhere possible , and use a teflon block as
> clunk. Can't replace the brass spray bar and nipples without machining
> capability, but the other changes should reduce brass contact at least
> fourfold.
>
>   Mine will be Webra and Mintors, and since both are AAC constructed, it
> automatically eliminates a possible source of catalysis
>
>   we'll see
>
>   Matt K
>
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