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FAN FAQ TOPICS:
Are VENTRY Fans stable? VENTRY Fans are known for being extremely stable and for not walking due to the patented, curved leg design and the composite Safety Propeller. Although not obvious in most photos of the fans, the outwardly curving legs provide a larger and larger footprint as the fan is raised. The large footprint anchors the fan and handles the high thrust developed by the extremely efficient safety propellers. Additionally, the asymmetrical design of the legs distributes the thrust forces of the prop and engine so as to prevent walking and rotation. Finally, being very light, the Safety Propeller does not resist every pulse of the engine (as heavier props do!) creating less vibrations. VENTRY Fans are known to be extremely stable and stay put! |
Above, a VENTRY Fan is used to move and maneuver two boat docks on Hauser Lake. Would we do this if the fan might walk?! |
An Assistant Chief in Iowa mentioned specifically his initial concerns about fan stability. Before trying a VENTRY, he had been very skeptical of the long legs, believing it would surely walk or be unstable, based on the photographs.
“To be honest,” he told us, “I only tried it because of the free trial. Now I’m a believer.”John Neils explained this further below (please also see Why Ventry? on the Advantages page):
“When I joined our volunteer department, the Chief ’volunteered’ me to build a PPV fan for the department. Two problems with existing fans were obvious. First was the problem of aiming the airstream over obstacles like entry steps, especially at mobile home fires. The second was ground debris being sucked into the fan. . . Every student pilot learns not to run up his/her engine over loose gravel; it gets sucked in, wrecks your prop, and gets batted through the windshield of the Lear jet (which costs twice as much as your airplane)! The solution to both problems was to elevate the fan. The problem would then be to handle the high thrust created by a properly designed prop (a story in itself).
“The solution was our curved leg design, and good enough that we were granted a patent. As the curved legs are extended, the fan base widens, adding stability and handling the thrust. Also, with a VENTRY fan, your people can decide to elevate or not as the situation requires.”
