I've just started flying a 35% extra with a new DA 100 mounted in it. I have a gallon and a half of fuel run through it and the low and high needles set very close to the manufacturers suggestions. Doesn't slow down on up lines at all, transition is a little rough around mid range but not bad. Easily 2 1/2 to 1 exit opening compared to inlet. Anyway, since this is my first twin gasser I didn't want to burn it up anytime soon. When I land, the top of the fiberglass cowl is very warm and so is the aluminum spinner. Not so hot that you can't hold onto without getting burnt but definitely very warm to hot. My only comparisons are two, 80 inch caps with moki glow power and the cowl stays cool and the spinner is cool except the time I leaned out the low end and I landed with a very hot spinner. The DA 100 really fills up the cowl in this plane but I know there are others flying this combination so I'd like to know if this is normal or should I look into baffles and or larger air outlets. Thanks, Jim

Jim,
I have the same combo, and have made the same observations. Gotta remember the fuel also cools the glow motors. I understand that these motor run hotter and that warm feeling is normal. I have almost 3 gallons through mine now.
Also, I would wait untill you switch to the "normal" mixture before fooling with the settings too much. My transition is also not the greatest, but it is on the rich side, and I will leave it there untill it is broken in.
Good luck
RickP

PS, Can anyone else confirm this?

The heat in the spinner and on the top of the cowl are normal. I would however put some baffling in the cowling, in particlular from the bottom lip of the front of the cowl to the bottom edge of the engine cylinders. Some light ply or balsa held in place with "Household Goop' glue is a very quick and simple way of accomplishing this.