Thanks, Alfred.
My Goldberg Ultimate has been on the building board now for about ten years, now it's all framed up and ready to cover.
Originally I bought a supertigre 90 and a pitts type silencer but swapped the engine for a 61 4 stroke for my wot4 and sold the muffler on. I then bought a thunder tiger 120 pro for it but sold that one on.
Now I have a saito 125 for it and also an os 91 fx. Can't decide which to fit.
Until I cover it I bought a Black Horse Ultimate which is EXACTLY the same outline as the CG one, the only difference is the cabane arrangement and it has a fibreglass cowl and alloy u/c. Even the weight is almost the same. This plane has been assembled(artf) for about 6 months using the saito 125 as the engine but I've yet to fly it, when I do it'll whet my appetite and I'll get the goldberg one finished and covered this winter. I have bought several rolls of dark blue fibafilm to cover it and keep the weight down.
The only real changes I made to the CG design was to replace the ribs that hold the interplane struts with 1/8" birch ply ones, have a micro digital servo in each wing half and I've nailed a perry ocillating pump to the firewall and the tank on the c of g. I also bought an aftermarket fiberglass cowl that is very heavy and will help balance the plane if I fit the saito. I'll get a spare Black Horse cowl as they are only about £12 ($18) if I fit the OS as it's a bit heavier and the cowl is a lot lighter than even the ABS original one and fits like it was made for the goldberg bipe as it probably was. ( even the canopy is identical!!!!)
Whichever engine I fit it will be inverted as the thought of a cylinder head sticking out the side like a wart doesn't appeal to me.

My CG Ultimate will wear #46 with pride!!!!