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Hirobo Schweizer 300 |
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Hirobo Schweizer 300 |
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Tail boom & tail gear box |
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The majority of the tail boom assembly is fabricated in aluminium. |
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The tail gear box comes pre assembled and runs very smoothly. |
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Although the gear box arrived pre assembled an extra bit of grease won’t hurt. |
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The instructions suggest running the tail pitch control rod on the outside of the tail boom. Since this method is an unattractive solution some modification was required to run the pitch rod down the inside of the boom. This was accomplished by first drilling a hole just large enough for the pitch rod to pass through the tail boom support as shown in the picture. |
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An exit hole for the tail pitch rod and its support was then cut into the tail boom. Notice a slight curvature in the cut. |
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The tail drive is supported in a hollow grey plastic tube that is also modified to accommodate the internal pitch rod guide. |
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The pitch rod is of the silicon type and this runs inside a stainless steel support tube. This combination is as frictionless as possible. |
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The stainless steel support tube is held in place by some slow curing epoxy. |
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This set-up results in a very straight, well supported and smooth assembly. |
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The addition of the tail blade holders and tail feathers complete the tail boom assembly. |
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An ingenious universal joint is attached to the tail drive to allow for the scale incline of the boom. Once all of the aluminium braces have been fitted the boom is very well supported and strong. |
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Webmaster: John Neasham |
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