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Trying to Quieten the 110KVA Generator

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Spurry:
That's looks like the foam gun could make a very useful contribution to that top gap.

awemawson:
Yes it's difficult to decide how fussy to be. There is a (needed) 2" gap from partition top to corrugations otherwise getting them in is practically impossible single handed.

There are foam 'eaves fillers' available that fill the corrugations but still leave the 2" gap. I was on the point of pressing 'buy it now' earlier but decided to wait and see what the effect is without them - if I do fit them I can fit a bit of 2x2 to the top with the eaves filler glued to it. Ideally I'd lift the panel to the corrugations to loose the gap and keep the foam out of any ground dampness but that may not be possible.

If I get the chance tomorrow I'll cut a second panel to the 1/2" wiggle room and try another approach angle - the trouble is that both the floor and the roof slope, and what 'should fit' below the angle iron doesn't clear the rest of the roof.

(I need to bring the panel in horizontal (due to height of entrance) turn it 90 degrees, advance in to the point it's going, then incline it at 45 degrees up slope towards the generator, and tilt it up until it engages with the top angle making the angle steeper as I go until vertical by which time it should be in place. Trouble is I can't lift it easily and have to have it on my back Ninja style!)

vtsteam:
Andrew I have a distant memory of some articles about silencing 4 cycle motors with tuned pipe lengths (straight, not automotive header/collector pipes) And increasing exhaust extraction efficiency at the same time. It's a really dim recollection, but I think it was actually in experimental aircraft design.

Pipes were quite long, related to RPM and wavelength of exhaust gas, and it gave calculations. Extremely simple and low cost exhaust systems. Since your generator runs no doubt at fixed RPM, a simple straight tuned pipe might be doable, especially if vertical. Wish I could remember where I saw that -- about 25 years ago. Maybe an older EAA publication which I collected. If I get a chance (and if of interest to you) I'll take a look at my old EAA books.

awemawson:
I gave up with the circular saw and reverted to the 9" angle grinder - oh that it was 10" as it only just cuts deeply enough if it is held at precisely the right angle. I cut the next panel (panel #2) with just the 1/2" wiggle room and it went in very nicely, doing a dance I described in my previous post.

By counter weighting cut panels I was able to move them on the pallet truck which made things much easier.

Panel #3 cut to the same loose fit wasn't loose enough and had to have another inch removed. I still haven't cut the first panel round the beams as I ran out of allotted time.

By the way, no there won't be big gaps between panels - they are just clamped roughly in place, and when I can screw them will be shunted along to fit tightly - probably have to pull them together with a strap.

awemawson:
So in anticipation of a friend probably coming round this afternoon I have raised panel #1 about 1 1/2" to close the top gap and marked up for cutting setting in relief for the three structural members that need insetting.

Double manned it will be easy to set it on tressels and cut the bits out and put it in it's final position, - probably only take 20 minutes, but single handed would be quite different.

Poor chap will be press ganged if he turns up !

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