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Arplast PV50

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pjeffers(at)talktalk.net
Guest

Posted: Thu May 11, 2017 5:01 am Post subject: Arplast PV50

Hi Pat,

If you have the money then an Airmaster prop is one of the best on the

market that is still in production.Unfortunately the makers of the Arplast

PV50 prop are no longer trading so getting spares has become very difficult.

The Smart Avionics controller is very good and if you can get your hands on

a second hand unit then go for it.  It is a better unit than the old one

that you had. The Smart Controller is much more sophisticated and does much

more for you than your original manual unit, and it does not rely on

internal rechargeable batteries. It also controls the pitch automatically

rather than manually. Unfortunately, as you have discovered, Smart Avionics

are no longer making this unit. (due probably to Arplast going out of

production)



Re the indicated pitch, with your unit, the numbers mean nothing, as they

are entirely dependent upon the position of the sensing arm on the position

transmitter potentiometer spindle. The indicated range from fine to coarse

is also a variable dependant on the setup of this same potentiometer.

Adjustment of the range of movement from coarse to fine is achieved by

adjusting the limit microswitches on the prop pitch change screw jack.



Fine pitch should be adjusted such that on the ground (a/c stationary) with

WOT you achieve around 5,300 rpm.  This will give you about 5750 rpm at 65

to 70 kts ie

you are safe to t/off, clean up and start climb before worrying about

exceeding you max allowable rpm.



The coarse pitch limit will give you about a 10 degree pitch increase from

fine and should allow you to climb at a minimum ROC of 300ft/min and say 65

kts, at max wt. This covers the go around situation with the prop remaining

in coarse by accident or prop malfunction



I could ramble on but I won't unless you have any further questions.



Pete Jeffers (Europa Club Inspector)



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patdriessen

Joined: 19 May 2011
Posts: 6

Posted: Sat May 13, 2017 10:40 pm Post subject: Re: Arplast PV50

Thanks very much Pete.

Might try and locate a second hand Smart Controller from somewhere.

Patrick

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