Eagler's Nest
Airframes => Single Seaters => XL => Topic started by: Mrbill on September 10, 2022, 04:43:46 PM
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On the Hummel 45 what should the propeller position be in relation to top dead center? I have replaced my prop with a GSC 58x22 and I'm getting pretty good shaking. Right now I have it at the 10:00 - 4:00. I've seen posts on other sites which were probably for a 4-cylinder (counter clockwise rotation I assume) and they recommend the 2:00 - 8:00 position for hand propping. Any help would be appreciated.
Thanks,
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The prop is at 10 and 4 at the start of the compression stroke. Top dead center is a mark on the prop hub when aligned with the seam of the split case.
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Thanks Charles. I've reset my prop, but I'm still getting some shaking. I have the wings off right now and was just wondering if I have them on do you think it will dampen the shaking? I do have front starter on it as well.
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No, the wings won't change the engine vibration. Check the carburator slides to make sure they are synchronized, (open and closed the same amount) then adjust idle screws. I am assuming your Hummel 45 came with duel Mikuni carbs.