Extreme Flight 110" YAK-54 V2, Инструкция по сборке

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12. We will illustrate the DA120 with stock muffler option, but there are
many power plant/muffler options you could use. The DA120 will require
1.75” standoffs, this will yield 1” of clearance between the back of the
spinner and the front of the cowl. You could go down to ¾” but 1” is
preferred. We suggest drilling ¼” holes and using 3” long ¼ X 20 bolts with nylon
insert nuts and washers. Here I would recommend red thread lock (RTL). See
figures 17 and 18.
Figure 17
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