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Thread: [Acro] WOW---from RV list. why EXTRA'S cost so ...
Message: [Acro] WOW---from RV list. why EXTRA'S cost so much
Follow-Up To: ACRO Email list (for List Members only)
From: Phil Sisson <sisson at mcleodusa.net>
Date: Tue, 30 Jul 2002 14:27:05 UTC
> > Dan Checkoway wrote: > >> --> RV-List message posted by: "Dan Checkoway" <dan at rvproject.com> >> >> In the specs for the UPSAT GX60 IFR GPS/Comm, it says: >> >> "Acceleration 4G maximum" >> >> Anybody know what the deal is with this? Is this horizontal acceleration? >> >> )_( Dan > Dan-- > > Obviously, you've never operated a high-energy particle accelerator! Ah, the > memories of Brookehaven and Switzerland at CERN. Electrons have mass (let's > say about 10 GeV (giga electron-volts) and mass is affected by gravity. We > also know that a GPS receiver is nothing more than a VERY sensitive clock. > Now, then, when you exceed 4 g, the electons get bogged down in the GPS > receiver and get out just a tad slower--but slow enough to be detected by the > GPS clock. If you're tracking more than four GPS satellites, some of them > will be to the West and some of them to the East of you. The slow electrons > will make the GPS clock think that you are farther away from the westerly > satellites and perversely conversely farther away from the easterly > satellites so that the triangulation calculations in the software will not > reconcile. GPS receivers that are rated for aerobatics have thicker wires > and a series of small op-amps that will "accelerate" the electrons depending > on the internal g-meter reading (manufacturers call this "g-force electron > drift"). This is why airplanes such as the Extra 300 cost so much more. You > also made a major mistake in actually reading one of the manuals for > electronic equipment, since they have to be back-translated from Chinese > character figures--what's the Chinese character for electron-volts? > > Just trying to help. > > Boyd. >