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Nissan,
Do you know that for a fact, or are you surmising?
You are missing my point. The leaf blower is trying to move air, it simply can't "blow your hand off it", as you say, and I'm not too sure of that. I've never felt the need for one, so can't go out and check its output pressure.
However, it does indeed build pressure, with a 3 foot or so pipe and a flattened "nozzle" at the end. There is drag in the pipe, and a restriction of the pipe itself, not to mention that same nozzle. You can't move that volume of air, in that size pipe, without a rise in pressure
When you put your hand over the nozzle, you don't cause it to go to zero pressure, you simply get it to the max pressure that type of impellor, in that particular machine can maintain. Your hand isn't just resting on the nozzle, as if it were lying on a table, you are tensing against that particular pressure. And the pressure doesn't continue rising because, for this application, they did not need to design an efficient impeller, one that could force even more air into that closed tube.
Once you have equilibrium on the intake and discharge it just churns the air in the impeller itself, no air going out, so no air coming in.
Try it on your shop vac. Plug the discharge, then hold your hand over the intake. You will feel very little suction, if any.
And, I said above, that at the maximum boost range of your engine, so I've read elsewhere, on this forum, you may get up to 2 BAR of boost, 29 1/2 PSI
I'm not sure if the turbo guage is set at absolute or atmospheric, 2 BAR, I would assume atmospheric, and at idle, you would be at, perhaps, .7 BAR, the NA ideal of about 21inches of vacuum. So, at 1 BAR, you are at free flow, you can get all the air you need, and when you go faster, you get the turbo to produce as much air as the engine needs, with a positive pressure, as much as another BAR, another 14.7 PSI.
At some point, however, you are going to get to the point where your turbo, unless oversized, cannot deliver the air your engine needs, and "volumetric efficiency" falls off, the engine starts to gasp for air, and the power produced plateaus, you quit gaining speed because you are out of breath.
One advantage of this leafblower idea is that you would have all that instant response at the low end.
Ah, well, probably hit the sack, now.
Cheers,
George
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