Great Planes Super Sportster (original) - Manual (Page 28)

CHOOSING A MOUNT
Low weight and rigidity are important in 4-cycle mounting. Hayes and Tatone both make good mounts for
4-cycle use.
The Hayes mounts will fit 40's, 46's and 60's. The AL-40 is good for the Saito .30, The Enya .46 and Saito
.45. The AL-60 will fit the Enya .60 and the OS FS-61. Currently Hayes does not make a mount for .90 use.
Tatone produces aluminum mounts that are predrilled for individual engines.
Both brands are lightweight. To improve rigidity, we recommend installing a front bulkhead. This essen-
tially gives a beam mount system that is extremely rigid but makes removal of the mount a little more cum-
bersome.
BUILDING PROCEDURE
Following are steps that refer to 4-cycle installation to replace the steps in the front of this instruction
book. Refer to these steps as you build your model.
BUILDING THE FUSELAGE
Step 2
Prepare the Firewall. Mark the "top" of the Firewall. Mark the centerline of the engine on the Firewall and
center the mount in position. The thrust line of the engine should be in the same position as shown on your
plan. Drill holes and install blind nuts. Temporarily install the mount and trim the mount bolts that extend
into the tank compartment. Drill hole for throttle pushrod to carburetor (make sure throttle pushrod does not
interfere with tank).
Next bolt the engine to its mount. If you use a Hayes mount, position the engine as far back as possible
leaving sufficient room for engine and/or carburetor clearance. Make sure you don't put in any right or left
thrust.
Then measure the distance from the back of the mount to the prop (thrust) washer. To do this, place the
engine and mount on a flat surface and put a straight edge across the thrust washer. Measure back from
this straight edge to the back of the mount. This distance is "B". Refer to the drawings and the chart on the
next page. We are measuring this distance so we can determine how far back to move the firewall so the
engine will fit into the nose of the model.
Figure 1
2-CYCLE ENGINE
S55
GREAT PLANES MOUNT
28