The roll bar support arm, a part of the canopy rail on the completed Mk 1 fuselage is easily bent. There is a tendency for pilot and/or passenger to put their weight on this piece when exiting the airplane. On the latest fuselage for the iS/U the factory has addressed this issue by adding a supporting gusset.
Shown in Figure 6.
This can be retro-fitted to our older fuselage, although it is not offered by the factory as a retro-fit kit. The F-1254A part is available for about $5. The plan shows the top row of rivets to be AN470AD3 solids but that is not possible after the ship is built, so I just used all LP4-3.
This is a worthwhile upgrade for the older fuselages with little cost or time involved.
Shown in Figure 6.
This can be retro-fitted to our older fuselage, although it is not offered by the factory as a retro-fit kit. The F-1254A part is available for about $5. The plan shows the top row of rivets to be AN470AD3 solids but that is not possible after the ship is built, so I just used all LP4-3.
This is a worthwhile upgrade for the older fuselages with little cost or time involved.