REFLECTOR: Hydraulic Pump Leak..fluid levels

Al Gietzen ALVentures at cox.net
Tue Dec 14 10:50:28 CST 2004


 

 

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Alex Balic
Sent: Tuesday, December 14, 2004 7:23 AM
To: Velocity Aircraft Owners and Builders list
Subject: RE: REFLECTOR: Hydraulic Pump Leak..fluid levels

 

  Just as a rough guess (not being at the aircraft this morning)  but if the
main cyl is 1.5" diameter, and the rod is .375 diameter, then the difference
would be  25% in both volume and power calculations- with a (another guess)
stroke length of 18" this would be a difference of  4.4 oz of fluid- the
nose cylinder probably adds another oz or so.

 

The volume goes as the square of the diameter.

 

Al

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
Behalf Of Al Gietzen
Sent: Tuesday, December 14, 2004 12:34 AM
To: alex157 at direcway.com; 'Velocity Aircraft Owners and Builders list'
Subject: RE: REFLECTOR: Hydraulic Pump Leak..fluid levels

Subject: RE: REFLECTOR: Hydraulic Pump Leak..fluid levels

 

You would think that, but remember that when the cylinders are extended, the

fluid volume is the volume of the cylinder bore x stroke, when the cylinders

are retracted, the fluid volume is the volume of the cylinder bore x stroke

minus the volume of the rod(s) - so there is a significant volume

difference- this type of difference is also taken into  account in the

calculations of cylinder power, since on the out stroke, you get full power,

but on the return stroke, you do not, since you must subtract the rod end

area from the  total piston area.

 

All  true.  The difference is about 6%.

 

Al

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