You should swap out the stopper if you use gas! I usually use sullivan conversion stippers so I don't know what to say about the Dubro.

I haven't done a final check on my ZERO yet to see CG, but have balanced it quickly on my fingers and it seems to be around 145mm from leading edge. The specs call for 148mm - 155mm, but most are saying to move it to 135mm - 145mm Like I said I used the 25cc with mag. / not electronic ignition. I used a 16oz fuel tank and I added a B&B smoke system with a small 4% smoke tank. With glow the fuel tank goes up by the fire wall which puts it in front of the CG. With gas you can move it so I put it back right on the CG, so I stacked the 4oz smoke tank on top of it... I have friends who have P-47's, Corsairs, and Mustangs. I want to have it so we can do mock air combat and be able to in the end hit the smoke to look like the ZERO is hit! Silly but fun for Fun fly shows.

Since going to gas a few yrs ago I have slowly sold or switched my planes over... Now that these lighter 26cc and 20cc engines are out it makes it easier... My one friend just put the Zenoah 20cc in the Hanger 9 P-47 Thunderbolt and it works great... Just the difference in fuel cost makes it worth the change let alone the mess.

Now that Fuel cost for Premium gas has gone up I have been checking into running Coleman Fuel... Works the same but cleaner then gas and doesn't have the smell...

I have a DR-1 that I take to shows and one of my friends flys a Snoopy dog house and we put on a show for people at the show.

I have always used Klotz syntech oil in my brisons but they call for 80 : 1 and they show other mixes and say go with what the manufacturer suggests... I'm going to stick with the Klotz it's got a great reputation. I just didn't know what was recommended for the 25cc GT toro... for mix ratio.

Good luck... Tell your friend go gas wants he switches to gas he wont go back Glow!