Mounting Motors for CO2

The Mini Old Timer models can be powered with a variety of CO2 and electric motors. Some of the models are adaptable to rubber power, as well. Small screws from the model railroad counter at the hobby shop will be helpful to mount either type.
Don't glue batteries or the CO2 tank in place until your model is completed and ready for balancing - move things around to avoid adding ballast weight. Secure the tank or batteries with a dab of silicone glue and it will be removable when necessary.
Electric charging jacks can be mounted just about anywhere. HiLine's jack acts like a switch so you are saved the trouble of installing and carrying along that extra item.
You may want to consider fitting your model with removable hatches to allow taking your power plant system out of the plane for use elsewhere. This can be done easily with a tack-glued block or sheet hatch. Use a small dab of white or silicone glue in a place where you can cut it away.

This motor can be mounted quite easily by cutting out the plywood mounting ring and gluing it to the motor case with CA glue. As noted on the plans, each firewall (guess we don't need a firewall when our propulsion system contains CO2 !) is marked for mounting the Micro4 by cutting out the rectangular hole. If the hole is made just a bit wider, the batteries, wire and charging jack can be installed through there.

This motor is essentially the same as the Micro4, but it has a ply mounting plate on the front end and a gear reduction mechanism on the back end. Mounting this one may require making the body of your model wider to accommodate the width.

The smaller VL motor system also has a gear drive which may also require widening the body.

This ungeared motor system appears to be too low in power to satisfactorily fly the Mini old Timers. If you substitute very light indoor wood for all of the kit parts, it's possible that the Kenway could fly the model, but outdoor flying is probably not possible.

There are lots of motors suitable for the Minis - Telco, Shark, Brown, Gasparin 63 & 120, & the Russian motor to name some common types. All can be mounted to a ply firewall/mount and thrust lines are shown. Be sure to allow access to the throttle device - the older Telco types have an eccentric crankshaft bearing for speed adjustment - most others seem to tighten/loosen the cylinder where it's threaded into the crankcase. Also, the tank must have its outlet elevated above the horizontal to prevent freezing up. To facilitate charging, just hang the charge fitting out of a window or some other opening in the body. The alternative is to build a ply mounting plate into the plane - but then, the support must be quite strong to withstand the 4 lbs of pressure needed to charge the tank. So, just hold the charge fitting, dangling the plane from your hand while charging.

Copyright 1997 A.A. Lidberg, all rights reserved.