RE: Second plane
G'day
I have the Four Star 40 and the Mid Star 40. They both fly well though I find the Mid Star easier to fly as its wing is larger and so its wing loading is lower.
When I first finished the Mid Star I put a Super Tigre 51 in it. It was total over kill and I had problems with the engine until I worked out that it needed a new plug so I then put a Saito 62 in it. This was good but a bit overpowered. Eventually I put an OS 52 Surpass four stroke in it and it worked well. Then later I put an Irvine 40 diesel in it for a diesel meet and it is still in it though I have not flown it for a while.
I also have the 60 and 120 size versions of the Four Star and I must say I prefer them to the smaller 40 version as they are more stable and less thrown around by our rather turbulent site.
The Mid Star may also be better to mount a battery in with the wing access at the top but you would be better in either case building a hatch for battery access.
They are both easy to build and the kits and instructions are really good.
If you do build the Four Star 40, I would suggest you do everything you can think off to save weight as a light one such as a friend of mine had flies really well. It only had a very old and quite anemic Saito 40 in it but it flew really well.
Have fun.
Mike in Oz
PS, that is my 60 size Four Star on the left. It now has a Saito 100 but originally flew quite well with a Saito 72.