I recently purchased a Goldberg Extra 300 and am building it for 3D, modifying the build as I go. My question is if anyone has experience with this plane with different engines, I want a four stroke but dont know which has enough power to hover this plane efficiently? Will a Magnum 1.20 do it? O.S. 1.20? Enya 1.55? I would rather keep the cost down by not buying to logical choice, a YS as I have many projects going at once. Any input on this and or engine/prop combos that work or kit mods to consider as I build would be appreciated. Any experience with constructing the tail feathers as built up airfoils instead of slab? Thanks for reading.

I have flown one with an OS 1.08 which does fly it very nicely. Not unlimited vertical though or enough to pull out of bad situations from 3D. The OS 1.6 would be a better choice for unlimited and 3D flying. I had one in a GP Giles that is a similar size plane. Really nice combo and sold it to return to gas engines and larger planes for IMAC.

EXCAP232

I have flow one with a 1.20 but it wasnt my airplane so i dont know how the vertical was, but i would imagine with an 8 or 9 pound airplane there should be no reason that a 1.20 wont work

I think I am leaning towards the Saito 1.50 four stroke, I am reading mixed reviews with anything smaller reguarding how this thing will pull out of a hover with a 1.20 on it... I want to be sure I have enough, anybody tried this combo yet?

moki 135 will give you what you need and at the right price.