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General control line discussion => Open Forum => Topic started by: John Stiles on February 18, 2013, 09:10:01 AM
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Darwin 4 "A" I'm thinking the "4" is the ounces? ??? Any help locating this tank will be greatly appreciated. H^^
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Hi John. This was an all-brass tank, 4 ou. With U-shaped wedge, rounded rather than bent outside wedge. I think they may have wanted to have the fewest sharp bends possible because they had a bad habit of cracking on the inboard side where the sharp bends were. Brass is a poor choice for tanks. Nitro fuel eats brass pretty fast. If you purchase a tank with brass tubes these should be replaced from the start with annealed copper. If you find your Darwin tank and are really going to use it watch for leaks or just copy it in tin and copper, using electrical solder-not acid core or silver solder as the flux will spoil your efforts over time.
Dave
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John,
Do you have a picture or sketch of this tank that you could show us?
De Hill
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John,
Do you have a picture or sketch of this tank that you could show us?
De Hill
It's the same sort of brass tank that they provided in the Firecat kits, if that helps. It would be easy to replicate from easy-solder tin.
Brett
p.s. you can find these for sale on that auction site, here's a picture. Evolution appears to have not been kind to the Darwin company:
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Hi Dave. When you say "annealed" does that mean putting the temper in (making it harder) or taking it out (making it softer). I never seem to get that right. H^^
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John,
Do you have a picture or sketch of this tank that you could show us?
De Hill
Hi De, it's the one shown in the Ringmaster Imperial kit, the detail is very small, but it looks like it has the pointed outboard side, rather than curved. I'll try to get a picture up. Leaks always freak me out, that's the reason I went to plastic tanks mostly. I have a 6oz bottle that would fit snug, but there's no clearance to work with behind the firewall.
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Hi Dave. When you say "annealed" does that mean putting the temper in (making it harder) or taking it out (making it softer). I never seem to get that right. H^^
Glenn it's to soften the tube so that it will bend without kinks and also to prevent vibration cracks later. I buy the K&S tubing at the hardware. I run it over a propane torch until it glows a little then let it cool slowly. It would go harder should you douse it (don't). It will have a little scale on it that you just sand off with very fine paper and you are ready to go.
Dave
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Hi Dave. When you say "annealed" does that mean putting the temper in (making it harder) or taking it out (making it softer). I never seem to get that right. H^^
Softer. It's still a generally bad idea because it will work-harden again anyway from vibration.
Brett
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John,
Do you have a picture or sketch of this tank that you could show us?
De Hill
Here it is:
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Solder one up from a juice can?
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Evolution appears to have not been kind to the Darwin company:
y1 I see what you did there y1
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Solder one up from a juice can?
I may have to, either that or go with a plastic tank and knock the rear former out of the tank compartment. I can put a 2oz DuBro in there, but Im not gonna get far on that little fuel.
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Here it is:
That sure looks like a VECO tank. I have a lot of Brass fuel tanks, but none like that one.
Sorry,
De Hill
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This place is great, look what I got in the mail today from a member.... he might not want to be ID'ed, so he can chime in if he wants. I'm totally stoked, the tank was an exact fit. Only had to relocate the suction tube and overflow, but the plans sorta called for that. I'll be mixing some epoxy in the morning. ;D ;D ;D H^^
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Isn't that what this group is about. Pass it forward, I think the movie stated. I have been helped by many thru the years.
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John I think those tanks are thicker than one inch so be sure the pickup tube is in alignment with the needle valve. I would recommend you use pads under the motor and you will need to shim the tank if you do. With out pads the motor mounts crush rather fast. With pads they seem to last forever. I still use those tanks on profiles.
Ed
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John I think those tanks are thicker than one inch so be sure the pickup tube is in alignment with the needle valve. I would recommend you use pads under the motor and you will need to shim the tank if you do. With out pads the motor mounts crush rather fast. With pads they seem to last forever. I still use those tanks on profiles.
Ed
Thanks Ed, I will certainly take that on advisement! Thanks H^^