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3DHS 48" Velox Motorbox Rebuild

quadracer

100cc
This airframe has been discontinued, and I've had this plane for about 9 months. I bought it used from a guy in Cincinnati, and have grown to like it a lot. My setup is as follows
-Motrolfly 2815-950kv
-APC 14x7E
-CC ICE 50
-Hitec HS65MG on elevator and ailerons
-Hitec HS85MG on rudder
-Glacier 3S 2200 30C LiPos

It isn't the straightest tracking plane out there, but it is a hoot to fly and get stupid with.

The previous owner had repaired the motor box before, and it held up fine until Knoxville FLI, where a downwind crankshaft mutilated the box and cowl in mid air. It being somewhat of a relic airframe, I couldn't find a replacement motorbox kit for it, so I started making one. I used 1/16" plywood for the sides, top, and bottom, and 3/16" plywood for the firewall.

ImageUploadedByTapatalk1378943046.487804.jpg
ImageUploadedByTapatalk1378943065.434868.jpg
ImageUploadedByTapatalk1378943079.285191.jpg
ImageUploadedByTapatalk1378943093.935128.jpg
I left a small gap in the firewall interlock tabs so I could adjust the down thrust angle if need be. I wasn't sure how much was required... Once I'm happy with how it behaves, I'll stick some wedges in to lock it in place.
It took about 4 hours, since I don't have a laser cutter, I drew all the parts out and cut them with an Exacto knife. Measuring and cutting all the little notches, tabs, and making the thrust angles is an absolute PITA. I really don't see how anyone can have the patience to do a large scale kit build. LOL

Before:
ImageUploadedByTapatalk1378943364.118347.jpg
ImageUploadedByTapatalk1378943387.968212.jpg
 

quadracer

100cc
More "before" pics:
ImageUploadedByTapatalk1378943498.679543.jpg
Laying out the top plate
ImageUploadedByTapatalk1378943516.946129.jpg
Dry-fitting the left side
ImageUploadedByTapatalk1378943571.579487.jpg
Making sure the top and side mesh together well
ImageUploadedByTapatalk1378943618.246893.jpg
Right side plate layout
ImageUploadedByTapatalk1378943639.362647.jpg
Dry-fitting top and sides
ImageUploadedByTapatalk1378943675.296180.jpg
 

quadracer

100cc
I only replaced back to the third former, since most of the load (on my setup and battery location) is centered over the first and second formers. Hopefully I'll get to fly it tomorrow and report back with good news.
 

quadracer

100cc
Finally got time to remaiden it a few minutes ago, 2 clicks of elevator trim and she was flying just like before! (Sans cowl, and with a busted up canopy..)
 

SnowDog

Moderator
That's great work Sam! A buddy of mine did the same thing with the 51 Slick motor box after his got crunched and he made a copy for me since I needed one too. Glad to hear yours worked out so well!
 
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