Now that thread was a blast from the past
Okay, you want to make a Dumas Circus Circus into a race boat. Plan on replacing all the "mahogany plywood. As I told the guy in the RCZ thread, use the kit parts as templates and replace the framing as follows:
1/16th Ply) All cross frames except transoms
1/8th Ply) All lengthwise frames and left sponson transom, as well as sponson sheers
1/4 Ply) Right sponson and rear transoms
1/4 Square spruce stick stock) Used for stiffeners and glue blocks, as well as to frame the bottom of the sponsons
Forget about the supplied wood tails and rear wing. The first time you blow it over, they will be history, along with the transom and decks. There are sources that sell fiberglass tail sets that are much lighter than the wood.
A few other things to look at:
1) If the tunnel isn't at least 11.5" wide, increase the width to between 11.5 and 12 inches.
2) Cut out lightening holes everywhere you can
3) I would scrap the aft radio box and move it to inside the cockpit area to eliminate some weight the prop would otherwise have to carry.
