Gentlemen ...

I've recently started my RSM "Shoesting" build and I've run into a snag .

Here's the condensed story ...

I talked to Eric Rule about the stunter and he recommended that I use the 7 oz. GRW700BU tank , rather than the plan recommended 6 oz. tank , as I'm using a RoJett .61 BSE RE with pipe .
He also said to remove the leading edge of the wing (where the tank will extend into the wing).

My concern is , how to reinforce the cut out , so as to not weaken the wing structure ?

The tank is as tight to the header as I wish to allow , without turning the plumbing into a nightmare .

Here's a photo , showing the set up ...

Thanks ,

Rob K.

Hi Rob,

Do ya have enough room to make your own tank?? You can away make the tank thicker so it will hold more ounces and design the fuel tube to work with the motor.  I believe that would be better than cutting the wing spar. I'm using a double star 61 RE lite case with my shoestring and it doesn't use as much fuel. Just a though and yes making a tank will work, Gary

In reality the strength of the center joint is derived from the spar and its joiner at the thickest part of the airfoil. The only thing you really need to do is box the cutout section in with firm 1/16 and maybe .5 oz glass to tie it all together.

I have my Kevlar suit on.

Do ya have enough room to make your own tank?? You can away make the tank thicker so it will hold more ounces and design the fuel tube to work with the motor.  I believe that would be better than cutting the wing spar. I'm using a double star 61 RE lite case with my shoestring and it doesn't use as much fuel. Just a though and yes making a tank will work, Gary

     Good idea, I like that a lot better than cutting into the wing. It's relatively easy to get 8 oz of fuel into 6" of space, if you make the tank 1 1/4" deep and as wide as the fuse will allow (with the RO-JEtt, that's about 2 1/8" or a little more). You will probably need to do something to knock off the front bottom corner to clear the header, but that's not too difficult.

    Brett

p.s. this is the bigger of the two tanks I have used recently - 7.7+a little ounces 6" long. BTW, if you set yours up the way I do mine, the 61 will take about 6.5-6.6 ounces of 10% at sea level and 15% in the Midwest in the summer.

Hi Fellows ,

First , let me thank all of you for the help with the Shoestring tank , etc .

I'm going to build a tank (as per Brett Buck's suggestion) and with a tapered , or slanted front , it will fit nicely under the header , with just millimters to spare for th wing leading edge .

I've built a card(paper) model of the tank to test the fit , already . Now I'm pumped to make the new tank (just waiting for the sheet metal),

Thanks again,

Rob K.