Throttle Vernier re 182 rg

Throttle Vernier re 182 rg

<HTML>Does anyone know of a STC for a throttle vernier for a TR 182 RG. Also I want to speak to anyone who flies a TR182 RG as I have just sold my normal 182 RG and find the turbo on my TR 182 RG has a terrible lag. Is this normal? As I live in England there is no one to talk to with another turbo overhere.</HTML>

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Re: Throttle Vernier re 182 rg

<HTML>Installing a vernier throttle is a simple matter of buying the part and installing it.  It is a minor change according to most A&P's, but if your shop doesn't agree, then a field approval shouldn't be difficult.  (Field approvals are always smoother if you consult with your FSDO before you actually do the work.  It doesn't settle too well with many inspectors to find someone has gone and altered their airplane and then want THEM to approve of the change.)  If you get the part from Cessna and reference the Cessna part number then it'll likely be a rubber-stamp affair.
Personally, I don't care for vernier throttles.  Mixtures and Props, yes, but not throttles.  It's just too much twisting and fiddling when taxying around the airport, and inflight the throttle is really not that sensitive anyway.
If you are at a very low power setting, and if you make large throttle movements increasing power, then you will experience a "lag".  This is due to the way turbo-chargers work.  Before a turbo can "pump" more air into the intake, it first has to spool up.  It gets it's power to spool up from hot exhaust gases.  But while you are adding power, those exhaust gases are also increasing in volume.  If you rush the process in an attempt to get to a particular manifold pressure, by the time you've got the throttle positioned where you think it needs to be,....then the still expanding exhaust gases continue to build and speed up the turbo to a point beyond the aforementioned setting.  Now you either have a "surge" or you have to reduce the throttle setting.  Most turbos are less sensitive to this after the oil temperature has warmed up to normal operating levels, and also when they have already achieved stabilized power settings above 65%.  Add power slowly at first until the prop begins to "govern" at the selected RPM.  Then continue to add power slowly until manifold pressure is above 20" or so.  At this point adding still more power will behave much more instantaneously.  But remember,...don't rush power setting changes.  It's hard on your engine anyway, and is usually the result of poor planning.  One of my friends favorite quotes from his instructor was,.,,"I don't care how far ahead you're looking.....IT AIN'T FAR ENOUGH!"  (grin)</HTML>

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