B238
MAKE: SynchroLite ~
Control - Flight - Collective
Idea - re: Collective Handle(s)
Consider using modified handle from outboard motor. It has built-in rotating handle and is made from aluminum.
Blade Pitch in Autorotation
I spoke to mechanic at Chinook Helicopters. He sets the low pitch stop on their Bell 47 at +1º. If the helicopter was to be flown with a lightweight pilot and little gas he might reset it a little lower to get required rpm. He said that at +5º pitch the helicopter would just about hover. The +1º is the lowest the collective will go and is also where the collective is left for full autorotation.
Spoke to Heli-College instructor and he said that the only time one has minimum collective is during autorotation.
From coding in form [Controls - Flight]
Public Function collective_movement(Movement As Single) As Single
'To transfer inputs from the pilot's collective lever to the swashplate.
'Movement is in inches of movement at end of lever.
Dim Ratio As Single
On Error GoTo collective_movement_Err
'Collective data
'Me.[Collective Max] = ??
' = 15 '[deg.] 'Maximum stick travel.
' = 2.9487 '["] 'Length of second arm/lever
Movement = Movement / CollectiveStick 'Get Sine of angle
Movement = Atn(Movement / Sqr(-Movement * Movement + 1)) 'Convert to radians.
collective_movement = 2.9487 * Sin(Movement) 'Output is in inches
'## The above 3 lines could be done by the following 1 line
'## collective_movement = Movement * (3 / CollectiveStick)
collective_movement_Exit:
Exit Function
collective_movement_Err:
MsgBox Err.Description
Resume collective_movement_Exit
End Function
Back to top | SynchroLite Home Page
Last Revised: August 8, 2000