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Viking 130/150 VIP – In-Flight Adjustable Propeller Firewall Forward Kit

Viking 130/150 VIP – In-Flight Adjustable Propeller Firewall Forward Kit


This package is VERY comprehensive.  You will receive everything that you need to complete the engine installation without having to stop work for want of a hose or a clamp.  You need only provide your own batteries, oil and coolant.  That’s it.

The price is only applicable if purchased with a Viking engine as the FWF will ship with the engine (no provision is made in this quote for freight).  Also, the FWF is compiled by Viking from a range of suppliers so prices can change faster than I can keep this page updated.  Please only treat this price as a quote – your invoice will be generated separately after I have received price advice from Viking.  This allows us to keep prices down to the minimum.  Price updated on 15 Feb 23.

You get:

Engine Mount (all hardware; 4130 Chromoly Steel),

Cowlings (including a hinge connection system for quick removal and installation)

Compete exhaust system

Complete liquid cooling system (radiator, hoses, clamps, shroud, overflow bottle)

Air Filter (K&N)

Propeller (DUC Helices 3-blade carbon, prop extension, 13″ spinner, in-flight adjustable actuator)

Electrical (complete system components are supplied.  You only need to source the cable and connectors – or you can ask about our pre-wired solutions for you on a drop-in tray.  Battery boxes x 2, relay, bus, keyed switch, all engine breakers)

Fuel System (header tank with dual fuel pumps, valves, filters, high pressure fuel injection line, Oetiker clamps and pliers)

The mount is ready to go for most aircraft types and I can arrange powder coating for an extra cost in most cases.  The comprehensive inclusions allows installation of your engine by one person + a the occasional helper in three or four days (for a first-timer).  Full phone support or I can often come out to give you a hand if you like.



If you are not sure how an in-flight adjustable propeller works, well that’s OK – here’s a simple explanation:

Having an in-flight adjustable propeller instead of a fixed-pitch (or Ground Adjustable) propeller is like going from a car that only has a single gear, to a car with 1st, 2nd, 3rd and 4th.  In our imaginary car, you would need to decide before leaving home if you wanted to set your car up for hill-starts (STOL) or for the highway (cruise efficiency).  If you set your gear up for the highway then it will take a long time to get off the mark and up to speed, likewise, if you set your gear up for hill-starts, it will get off the mark really well and then red-line below your best cruise performance.

The in-flight adjustable propeller can twist the blade angle AS YOU FLY so that you have the best angle at take off, and again as you speed up for the cruise.

That’s all it is!

In-flight adjustable propellers give you more value when they are used on faster aircraft.  As you move faster through the air, the angle of the relative airflow increases against the fixed-pitch blades until they are past their optimum design pitch.  In other words – fixed pitch propellers only work perfectly at one air speed and at one RPM setting.  Everything outside of that they are not at their optimum.  An in-flight adjustable propeller can always working at the optimum efficiency.

What sort of performance gains?  It depends.  Less % gain on slower aircraft.  STOL series – think maybe an extra 7 or 8 knots and 10% less fuel burn.  Faster stuff (Cruzer or 650 – and certainly the Velocity) these numbers will improve from there.

I have the VIP on my CH750 STOL and I am still impressed by what a significant difference this option has made to my performance and enjoyment of the aircraft.  Adding an in-flight adjustable propeller is not essential on any aircraft that is designed to cruise below about 100 knots, but if you can afford it – I promise that you will not regret it.  They really are that good.

I hope this helps!


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