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I've built a pretty good looking set of 80Hz horns. By that I mean the joints are all tight, the Baltic Birch ply is nice looking and should match well enough to the maple ply I intend to use on the outer cabinet.Last night I took a step back and started evaluating what I've done. Squareness seems to be a little off. Both of these measurements are from the farthest outside corners. One horn face is twisted about 3/16 from the plane of the mounting plate. The other is not twisted but the plane that contains the face of the horn and mounting plate when looking from the side is also about 3/16 out of square. These two surfaces are parallel with each other, but racked to one side. This is the one I'm most concerned with since it implies that the waves coming off of the driver may not impact the throat of the horn evenly. I'm guessing that 3/16 out at 25" is maybe 1/16 over the 8-9" throat opening.
The question is, do I have a good looking pair of mistakes or are these still within the limits to be useful?
Follow Ups:
The 80Hz horns were built square in a jig. I disassembled them and shipped them to you in a flat pack to save in shipping costs. You screwed them back together without a squaring jig. With all the complex angles the horns will naturally assume their own way of fitting which will not be square. The sound does not depend on squareness of fit. It only depends on the area progression with length. So fix the cosmetics to your liking and enjoy the sound.
It is the clones I built without a jig using yours as the master pattern that came out a bit off. I was figuring that if I messed up I could always use your flat pack horns.I apologize for not contacting you directly and if I've mistakenly caused some confusion.
Sure the good Doc will know more but I bet they will work just fine good luck;)
Thanks. I should get on the horn, pun intended, to Bruce but there is that big time difference between east and west coasts. :)
I owned a Mooney 201 for a couple years and from the tip of the prop spinner to the tip of the left wing and the tip of the right wing, there was a 2.5 inch differnece. I could never tell. The plane flew straight as an arrow, however, it took almost one full year for me to stop thinking something was wrong with that plan. When I look at my Edgar 80hz, I can tell they are not EXACTLY square, but they do sound great. Cheers.
The engine is offset a little to compensate for torque, propwash.Aloha,
The factory said they expect up to 3.5 inches off from side to side without control issues. Same thing with a Harley. The factory only holds the bottom of the forks to 1/4 inch either side of center. So when someone says their bike rides straight as an arrow, they got one with the forks dead center on the centerline. Cheers.
Before the Evo motor they had designed and tooled up for a nextgen motor. Trouble is, they hired some engineers who had no experience with motorcycles to head the project. The new motor tuned out to be considerably heavier on one side of the bike than the other. What to do? they had tooled up for the motor at considerable expense. Some idiot comes up with the idea to offset the forks from the centerline of the bike to balance it. Now, just having an engineer stupid enough to come up with that idea is a bad thing but they actually built one and took it to the Milwaukee mile for testing before giving up on the idea.
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