Hi,

I have a GP RV-4 that I’d like to put a OS-70FS into – problem being the spinner plate would be about 4 7/8” away from the firewall and the plans call it for being 4 1/2” away. I know this may only pose a balance problem and possibly the addition of weight to the tail, but should I worry and are there other options?

Do they make engine mounts that have a thinner base to be able to move the engine back a little as I have the GP Adjustable mount and it seems rather thick. Or should I not worry about this. I’ve heard of guy’s stuffing 4 stroke 70’s, 72’s and even one that claims a 90! So it can be done, but how?

Thanks!