Building Tips and technical articles. > Building techniques
Precision incidence tool.
Jim Svitko:
This was included in the Hangar 9 incidence meter. The digital protractor weighs 1.4 ounces with the battery.
When I use the Robart tool, I rely on the bubble level that is part of the system. I never trusted that needle and dial.
Motorman:
How do you know when the flaps are at zero?
Dave_Trible:
--- Quote from: Motorman on September 01, 2024, 09:49:41 PM ---How do you know when the flaps are at zero?
--- End quote ---
That can be a tricky matter. I’ve found the meter can fool you in this measure and it can end up off maybe a degree or less by some anomaly. I’ve taken to making flap centering tools that are much more accurate.
Jim Svitko:
--- Quote from: Motorman on September 01, 2024, 09:49:41 PM ---How do you know when the flaps are at zero?
--- End quote ---
I have settled on building with fully sheeted foam wings but I suppose this method can be used for any other wing. I tack glue a small block to the wing upper surface, and shim that block until a small bubble level on it reads zero when the Robart tool bubble reads zero. I do not fully taper the flap thickness so there is enough flat surface on it for the small bubble level. When both bubbles show zero, I am satisfied that the flaps are at zero with respect to the wing. I have done it this way for quite some time and it works well enough for me.
Ken Culbertson:
--- Quote from: Dave_Trible on September 02, 2024, 11:28:32 AM ---That can be a tricky matter. I’ve found the meter can fool you in this measure and it can end up off maybe a degree or less by some anomaly. I’ve taken to making flap centering tools that are much more accurate.
--- End quote ---
Good Idea. How far in do you slide it?
Ken
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