As no one else has replied, I 'll jump in once more.
Retractable bow planes add realism and interest to any model that features them. There are any number of ways to achieve this effect; flexible push-pull rods, levers and bellcranks, and even a sliding slotted plate affair Big Dave once designed have all been used successfully. The real fleetboats, however, used a set of meshed gears coupled to the retract rods to keep everything in sync, and this is the route I chose for my boat. I made my own system, utilizing a pair of nylon gears salvaged from an old VCR. I drive it with a long torsion rod coupled to one gear through a ball and socket universal, similar to Dave Merriman's design.
To allow for greater up and down motion when extended, I replaced the kits's rods with a pair of Dubro Swivel Ball Links.
These were carefully machined and trimmed down to fit into the planes and look more scale . Their length was extended with short pieces of brass rod, which make up to the gears.
One thing that concerned me was the possibility of accidentally trying to change the angle of the planes while they were retracted, as this might jam the servo or damage the linkage. Since my transmitter is computerized (a Polk Tracker III), it was a simple matter to program a lockout feature to the operation. As soon as the retract channel is switched to "rig in" the planes, the angle control channel is forced to the neutral position and disabled from moving. In the "rig out" position, the angle control is enabled once more. I have also incorporated a PIC microcontroller to slow the action of the retract servo to several seconds for more realism when the planes are moved in or out. Up and down angle motion is also slowed down a bit with a second PIC.
George "Crazy Ivan" Protchenko
“There are the assassins, the dealers in death; I am the Avenger!”-Nemo
"I'm disinclined to acquiesce to your request; means No!"-Capt.Barbossa