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Apr 07, 2011, 10:23 PM
"Auntie Samantha"
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Build Log

Starmax 63" P-51 "Gunfighter": The Radiator Vent Door


One of the features I liked about the Starmax was the Radiator Vent Door, so I set out to see what it would take to make mine functional.

Starmax Gunfighter_Radiator Vent Door.mov (2 min 2 sec)


The first thing I need to address was alignment of the linkage. I wasn't crazy about trying to run linkage from a servo mounted on the tray down to where I planned to mount the horn on the vent door, so I designed my own dropped & channeled servo tray out of some 1/16" plastic. I first cut the hole for the HXT 900 9g servo, and then took the hot air gun and started forming the tray. Once I got the dimensions and depth I wanted for the hole between the rudder and elevator mounts, I dropped the entire assembly down in there, and had a much better alignment for the linkage.

The door, on the other hand, was a bit more difficult. Because it fit so tight in the bay opening, I knew I would have to remove it so I could clearance it so it would swing clear and not bind the servo. To get the door out I had to cut the foam swivel hinges on the sides. I used a piece of FMS fiberglass spar material for the new hinge rod, and anchored it with two 1/2 x 1/2 square tubing plugs on both sides. I drilled the square centers of the plugs out to accept the round spar, and fit them to the side of the fuse. I epoxied one of those larger aluminum 30mm tall control horns to the door so I would have enough room for the linkage to clear the pivot spar.

NOTE:
I finally got a perfect match for the Gunfighter green. I mixed 1:1 Testors MM Medium Green #FS34102 with MM Olive Drab #FS34087 and it proved to be a perfect match. When applied with an airbrush it goes on flat, so to achieve the same sheen as the factory finish, I sprayed a coat of Krylon Crystal Clear Satin over it.
Last edited by Sandancer; Aug 21, 2012 at 06:18 AM.
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Apr 26, 2011, 04:32 PM
Registered User
flmlm's Avatar

Sweet!


Gary

Really like the operating door...well done!

Regards
Mike

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