Just wondering what fuel tanks fit the 4* 40. I see a Dubro 8oz is shown on the drawing but I would like to go with a 10oz or larger. Will a Dubro 12oz work or do I need a different manufacturer?

Hi rdhot, if the original tank is 8 oz., if you stick to the original tank shape then usually a 10 oz. will fit in with no mods. I would think to get a 12 oz. tank in you would need to fire up the dremel and widen the sides or the top a bit. A 10 oz. tank is really all you need for a 46 size engine. If you are at the field by yourself no big deal but, if there are others waiting to fly then flying for longer than a 15 minute flight may be infringing on flight line etiquette.

Thanks Fastsky. The thing is the 4*40 doesn't come with a tank and the Dubro 8oz is a little small for a 46 and Dubro doesn't make a 10oz, at least not that I could find. At the field I fly at there isn't usually very many people flying to have to wait it line.

Take the fuze with you when you next go to the LHS, you will be able to try or at least eye up what tank will fit from the LHS stock.

Here are links to a bunch of tanks, with dimensions listed. You might be able to find one that will fit.
Dubro 10 ounce
http://www2.towerhobbies.com/cgi-bin...?&I=LXD718&P=0
Great Planes 10 ounce
http://www2.towerhobbies.com/cgi-bin...?&I=LXK124&P=0
Hayes 11 ounce
http://www2.towerhobbies.com/cgi-bin...?&I=LXK831&P=0
Sullivan 10 ounce (mulitiple types)
http://www2.towerhobbies.com/cgi-bin...?&I=LXFU38&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXFU44&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXFU51&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXDND4&P=0
http://www2.towerhobbies.com/cgi-bin...?&I=LXFU63&P=0

THANKS Carrell. That helps a bunch!!!!

I am using a GP 8oz tank on 4*40 with 46FX and with full throttle it lasts about 9-10 minutes. I think it is preety enough, the 8 oz goes in and comes out through former F2 without any problem, if you get a 10 oz or 12 oz, you could still fit it in, there is enough space but you should do this before sheeting the front tirttle deck.

as they won't pass between fromers F2.

8 oz is preety good in my opinion.

Hayes tanks rock! They are easy due to the fuel nipple design. I really like them.