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In real life the come on after you twist the grips and pull the throttles back behind the idle stops. The beta lights in the sim version come on when you go to idle. It is extremely realistic to real otters. It's a system really only known to old turbo props and the otter. No modern planes have a beta backup valve because the beta system is almost fool proof. The yellow beta disarm light will flash if this occurs and the beta back up system will override the beta system and it will not allow the props to comeback farther than 9 degrees. The otter has a beta backup system, to keep the engines from going into an uncommanded reverse. You may be in reverse but the beta lights will remain on. The prop angle now can go from 0 degrees to -11 degree pitch and engines will start to power up.the beta lights tell you the the engines have sensed that you have twisted the grips and are in or beyond the beta range. If you continue to pull power farther back beyond the idle stop and beyond the beta range, you will enter reverse. This is done by a beta valve and linkages in the prop hub. You are simply controlling blade angle with throttle controls. This allows the props to go into ranges between 9 degrees and 0 degrees. On the twin otter, you must twist the throttle grips and pull them back beyond the idle stops. Last edited by scottb613 02-16-2013 at 07:10 PM.īeta range is not the same as reverse! It's simply a range of prop angle.
Premier aircraft design twin otter free#
Actually on you tube - you can see a sky diver jump out of the plane - the pilot puts the plane in a vertical dive - then the skydiver re-enters the very same aircraft while in free fall. Note how flat the blades are relative to their direction of motion. The following image illustrates what the beta range can do for you in flight - this would be impossible to do in an aircraft that doesn't have it - as you would exceed Vne in the blink of an eye. It's a setting for turbo-props where the prop is positioned to actually push back against the aircraft. I believe it's used to provide decreased stopping distance similar to reverse thrust on a jet plane. I do not believe the "beta range" is not allowed for normal flight operations as I believe the POH prohibits it. Take what I state with a grain of salt - as I am no expert. While I'm not an Otter pilot - I have jumped out of them on numerous occasions.