I picked up an almost RTF Sig Four Star 40 this weekend at a swap shop for $80. All it needed is the engine and electrics.
Unfortunately he didn't include the plans. Sooo, since this is my first 4star and low wing, I need the following information:

I'm going to have to drill out a hole for the throttle cable so the fuel tank that was installed has to come out. On my Midstar, I have a hatch for fuel tank and firewall access. This fourstar doesn't. Is that correct with the Fourstar plans, or did the builder mess up? Is it just me or is the body of the fourstar(width-wise) a 1/4" narrower than the Sig Midstar?

How do I put the servo tray in? Are the servos face up to the bay, but inverted for upright flight? Where do you recommend putting the receiver and batterypack? Where did you route the receiver antenna? A picture of someone's setup would be awesome.

Are there any other things I should be aware of and look for?

Thanks
Nathan

The plane is correct. there is no hatch on the 4* series plane. You should be able to get the tank out through the former where the wing dowels fit in. I have pictures of my set up at home. I'll e-mail them to you tionight unless someone posts sooner. My battery is a flat 4 configuration and I positioned it under the tank floor and the receiver is right behind that. Servos will be inverted for normal flight. I changfed the gear on mine and went with the fibreglass gear by dubro,

As far as I know the 4*40 only comes as a kit, so this must be a plane that someone built and covered but never installed the engine and hardware? Assuming a kit, here are some answers..

There is no hatch for the fuel tank. You just slide it through the fuse opening. I do't know about relative widths but I used an 8 oz Sullivan slant type and an 8 oz Du-Bro is supposed to fit fine as well.

The kit comes with a cable-type throttle linkage but there is probably enough room to use a regular wire setup if you like.

The servos are mounted in a conventional manner so that you can see the top of the control arms facing you when you look into the fuse. You will have to glue in some hardwod supports and then buy a servo tray or make one out of lite ply. Try to keep it toward the rear of the bay if possible, but make sure the servos won't hit the wing or the aileron control arms when everything is installed. By the way the plans and instructions provide very little detail on this for some reason so everyone has to be a little creative.

I have an OS 46FX in mine and it came out very nose heavy. I ended up moving the battery pack to the fuse behind the wing and still had to add weight to the tail. My receiver is in front of the ply servo tray. I routed the antenna out of the fuse just behind the wing and stretched it out along the bottom.

I'll add a picture of my setup to my photo gallery this evening when I have time if someone doesn't post one for you by then.

Its a nice-flying plane and an easy low-wing to start with. If you over-power it like I did it will be very fast but lots of fun. Good luck!

As promised, here is a pic of the inside of mine...

The pic is a big help

BTW, getting the tank out is easy. The tough part is getting it back in, but here's a trick:

Put some inner Flex-Rod tubes into the fuel tubing and route them through the firewall. Then just pull the tubes through and the fuel lines will follow.

What Minnflyer describes works great, but an even easier way to do it is route the tubes from the front and then attach them to the fuel tubing. This way there is no fishing to find the hole in the firewall.

Very true! (What was I thinking!? Long day LOL)

I flew back in 94-96 I built my first kit a 4* 40 just got in to flying it.and had to quit because of work and lack of time .I just started flying last summer in Oct- after I retired
my pulled my old trainer and the still bristle lime green 40 for a return to the filed but the fuel tank was lime green in side also
I took my hobby saw and cut behind the fire wall and in front of the rear former used my dram-ale blade to slice about 3/8 below the edge glued strip's of light play inside. ran 2 blunted servo screw's in each side installed a 12oz soft sided tank. that fit's real nice and tight through the rear former. and i have a very nice hood'. it's grate delight to be back at the filed and flying her agine.

ditto on the setup described by djsbean, be carefull to make the servo bay "deep" enough so the aeleron linkage doest interfere with servos.