I was talking to a fellow that had a hydraulic flap actuator (hand
pumped) with a quick release return on a Top Cub. Anybody know of a
good source for these hand pumps? Any listers used something similar
for flaps and what did you think about it both in construction and
function?

I've thought of something like a floor jack pump but they're all too
heavy and have too short of travel. I need something with more throw
and less force and preferably made out of aluminum.

Joa

> wrote in message
oups.com...
>I was talking to a fellow that had a hydraulic flap actuator (hand
> pumped) with a quick release return on a Top Cub. Anybody know of a
> good source for these hand pumps? Any listers used something similar
> for flaps and what did you think about it both in construction and
> function?
>
> I've thought of something like a floor jack pump but they're all too
> heavy and have too short of travel. I need something with more throw
> and less force and preferably made out of aluminum.
>
> Joa
>

The Republic SeaBee uses a handpumped hydraulic system to drive the flaps.
They have a separate hydraulic cylinder for each flap. The flaps tend to go
down one at a time! Fortunately, the split flap condition is easy to handle
and doesn't cause a great deal of roll tendency.

Many GA airplanes use hydraulic flaps. Mooney and Piper Apache/Aztec come
to mind immediately. Look at the system in a Mooney. It has worked well
over the years.

Highflyer
Highflight Aviation Services
Pinckneyville Airport ( PJY )

PS: Annual Pinckneyville rec.aviation flyin is coming up friday, saturday,
and sunday. Let us know if you are planning on coming by emailing Mary at
so she knows how many steaks to buy.

wrote:
> I was talking to a fellow that had a hydraulic flap actuator (hand
> pumped) with a quick release return on a Top Cub. Anybody know of a
> good source for these hand pumps? Any listers used something similar
> for flaps and what did you think about it both in construction and
> function?
>
> I've thought of something like a floor jack pump but they're all too
> heavy and have too short of travel. I need something with more throw
> and less force and preferably made out of aluminum.
>
> Joa

McMaster-Carr has some hand-actuated hydraulic pumps. Browse around
Mcmaster.com and see if there's anything suitable.
You might also look at the article at the Schreder sailplanes website.
http://www.soaridaho.com/Schreder/Construction/Cnstrctn_tips.html
About halfway down, there's a two-piece article on hydraulic flaps.

Tim Ward

Did you ever consider the pump from a "Port-a-power". Granted, it might be a
little heavy but they are quite compact.
Most of the cheap Chinese tool dealers like "Harbor Freight" have them. Just
a suggestion.

> wrote in message
oups.com...
>I was talking to a fellow that had a hydraulic flap actuator (hand
> pumped) with a quick release return on a Top Cub. Anybody know of a
> good source for these hand pumps? Any listers used something similar
> for flaps and what did you think about it both in construction and
> function?
>
> I've thought of something like a floor jack pump but they're all too
> heavy and have too short of travel. I need something with more throw
> and less force and preferably made out of aluminum.
>
> Joa
>

On 15 May 2005 10:08:25 -0700, wrote:

>I was talking to a fellow that had a hydraulic flap actuator (hand
>pumped) with a quick release return on a Top Cub. Anybody know of a
>good source for these hand pumps? Any listers used something similar
>for flaps and what did you think about it both in construction and
>function?
>
>I've thought of something like a floor jack pump but they're all too
>heavy and have too short of travel. I need something with more throw
>and less force and preferably made out of aluminum.
>
>Joa

Hopefully you can find something lighter than this - 12 pounds, $140
http://www.surpluscenter.com/item.asp?UID=2005051615412912&item=9-1851&catname=hydraulic

Have you tried looking for used one out of an old Mooney? Quick search
found this ad

PARTING OUT 1968 M20C

Not a wreck, plenty of good parts from the firewall back, complete
tail section, fuselage, control surfaces, interior, cowling, wheels,
nose and main landing gears, fuel pump, flap pump and on and on and
on, too many individual parts to list.

Ken Shoup MAPA # 16448 GA 706-235-0555 or cell 706-857-8663

Wayne

> wrote in message
oups.com...
> I was talking to a fellow that had a hydraulic flap actuator (hand
> pumped) with a quick release return on a Top Cub. Anybody know of a
> good source for these hand pumps?

How about an electric one? Power boats sometimes have them. and they are
small and light. Search West Marine.
--
Jim in NC

> wrote in message oups.com...
>I was talking to a fellow that had a hydraulic flap actuator (hand
> pumped) with a quick release return on a Top Cub. Anybody know of a
> good source for these hand pumps? Any listers used something similar
> for flaps and what did you think about it both in construction and
> function?
>
> I've thought of something like a floor jack pump but they're all too
> heavy and have too short of travel. I need something with more throw
> and less force and preferably made out of aluminum.
>
> Joa
>

How about some sort of brake master cylinder with a check valve along the line. Release would be a valve vented back to
tank from the flap actuator.

> How about some sort of brake master cylinder with a check valve along the
> line. Release would be a valve vented back to tank from the flap actuator.

Or, a faster alternative might be the pump for a hydraulic jack like they
use in some shop presses.

"Morgans" > wrote in message ...
>
> > wrote in message
> oups.com...
>> I was talking to a fellow that had a hydraulic flap actuator (hand
>> pumped) with a quick release return on a Top Cub. Anybody know of a
>> good source for these hand pumps?
>
> How about an electric one? Power boats sometimes have them. and they are
> small and light. Search West Marine.
> --
> Jim in NC
>

Steering for some boats is via a hydraulic actuator in some cases....

These are all great suggestions, thanks folks. What I'm really after
is a hand pump linear actuator since I want to use the existing flap
actuating hardware and just connect the linear actuator where the
current hand operated handle goes.

The trick here is that it really doesn't have to be that high of power,
just enough to substitute for the hand lever.

The article on the HPs was fantastic.

Joa

On 17 May 2005 15:18:40 -0700, wrote:

>These are all great suggestions, thanks folks. What I'm really after
>is a hand pump linear actuator since I want to use the existing flap
>actuating hardware and just connect the linear actuator where the
>current hand operated handle goes.
>
>The trick here is that it really doesn't have to be that high of power,
>just enough to substitute for the hand lever.
>
>The article on the HPs was fantastic.
>
>Joa


You might call some of the desert salvage companies. Years ago I used
to buy small aircraft hydraulic wobble pumps that were alum and
weighed less 4 pounds. I think they were used to open cargo doors on
some military aircraft.


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