Hi Lightning!
If you haven't already purchased G-62s, you might consider a pair of DA-85s for your Robart. They fit nicely in the cowls and weigh about the same as G-62s. I've installed a couple of 85s in my newly built Robart 'cause I wanted to turn near scale props ( two Mejlic 24-12W 3-bladers). If you find G-Pete's thread on his Z P-38M, you'll see he has successfully flown his model with 85s and he appears to be quite happy with the result.

I really would not worry about installing G-62s if that's what you want. If anything, on the Robart 38, I'd consider '62s the minimum powerplants to get good performance out of the model. This is because the Robart 38s DO come out a bit heavier than the Ziroli's BUT you do get a much stronger bird for the extra weight. While I haven't flown my 38 yet, I know a couple of Robart 38 drivers and they have indicated this model is the BEST flying giant scale 38 they own / have owned.

Here's my Robart just out of the shop....


Regards,
Lynn