VP engine Oil Vent Cap Rotorway helicopter

Engine crankase/oil tank vent with Integral Dip Stick

VP, LLc

Innovative solutions for your experimental Helicopter

Oil tank cap and vent

Here is an NTSB official report on the crash of an Exec 90 that you may find can save your ship from crashing:

The private pilot stated during a telephonic interview that he was hovering in an open field adjacent to the airport, when he began to lose rotor RPM. He landed briefly to investigate why the helicopter was not flying properly. He then decided to hover taxi back to his hangar and was trying to keep the nose of the helicopter pointed into the wind. While hovering with a slight right crab over a freshly plowed field the helicopter settled, the right skid contacted the soft terrain, and rolled onto the right side. The pilot stated that the loss of rotor RPM was the result of the loose engine oil cap that sprayed engine oil on the main rotor system drive belts.

The helicopter main rotor blades, tail rotor blades, fuselage, and tail boom were substantially damaged. There was no post-crash fire and the pilot reported no injuries. Weather was reported at the time as winds from 020 degrees at 7 knots, visibility 30 miles with few clouds at 7,000 feet and a temperature of 72 degrees.

When you notice that you are getting oil mist or an oily film inside of your engine compartment it most likely is coming from the oil tank cap. When this occurs you may wish to modify your system by venting the engines breather overboard away from the engine compartment and belts. This can be accomplished relatively simply. See below.

Engine crankase/oil tank vent with Integral Dip Stick VP, LLc Innovative solutions for your experimental Helicopter Oil tank cap and vent Here is an NTSB official report on the crash of an Exec 90 that you may find can save your ship from crashing: The private pilot stated during a telephonic interview that he was hovering in an open field adjacent to the airport, when he began to lose rotor RPM. He landed briefly to investigate why the helicopter was not flying properly. He then decided to hover taxi back to his hangar and was trying to keep the nose of the helicopter pointed into the wind. While hovering with a slight right crab over a freshly plowed field the helicopter settled, the right skid contacted the soft terrain, and rolled onto the right side. The pilot stated that the loss of rotor RPM was the result of the loose engine oil cap that sprayed engine oil on the main rotor system drive belts. The helicopter main rotor blades, tail rotor blades, fuselage, and tail boom were substantially damaged. There was no post-crash fire and the pilot reported no injuries. Weather was reported at the time as winds from 020 degrees at 7 knots, visibility 30 miles with few clouds at 7,000 feet and a temperature of 72 degrees. When you notice that you are getting oil mist or an oily film inside of your engine compartment it most likely is coming from the oil tank cap. When this occurs you may wish to modify your system by venting the engines breather overboard away from the engine compartment and belts. This can be accomplished relatively simply. See below.
The stock RW oil tank vent cap has essentially not changed since the days of the early Exec. It features vent holes around the bottom surface that vent oil mist all over the oil tank, engine components, and drive belts. The factory solution is to place a piece of foam around the oil tank tube to catch the oil mist. This method works somewhat until the foam slides down allowing the oily mist to escape into the engine compartment.
The VP, LLc oil tank vent with dip stick fits snuggly into the neck of the oil tank filler tube. The vent cap neck incorporates two "O" rings that prevent the oil mist from escaping around the vent cap.
The VP, LLc oil tank vent cap incorporates a hose fitting that you attach a vent tube to. This vent tube is run down through the bottom of the helicopter body tub where the oil mist and any moisture is vented into the air stream, just like every certified helicopter engine. The oil level dip stick unscrews from the oil vent cap so that the oil level can be checked without removing the vent cap. The vent cap is only removed when there is a need to add oil to the oil system.
When the VP, LLc oil sump vent cap is installed your engine compartment and drive belts will remain clean and free from the oily mess that is present in the engine compartments of most Rotorway helicopters. The VP, LLc oil sump vent cap also vents directly overboard. Other designs vent upwards allowing water vapor to condense in the vent line and then run back into the oil tank where it can combine with chemicals in the oil to produce destructive acids. With the VP, LLc system, the water vapor that collects in the vent tube will run down through the tube and overboard by gravity. In the photo to the right, note how clean all of the engine compartment components are. No oily mess to clean up or oil on the friction drive belts to cause them to slip.

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