The fin tab doesn't reach all the way to the engine mount tube. When glued into the body tube notches it is plenty strong for D and E engines.
Bill (BMS) told me the kit might be offered with longer fin tabs as an option. Email Bill and let him know if your are interested in the longer TTW fin tabs.
The shorter fin tabs fit onto a 3" wide balsa sheet. A 4" wide balsa sheet would have increased the price of the kit.
On the left you can see how the glue was applied before sliding the tab into the body tube.
TIP: When looking over the trailing edges the fins should be in a straight line.Here I'm looking across two opposite fins to check their alignment. You can do this visual alignment with four fin models, not three fin rockets.
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