If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Pump driven prop????
On the stern of some paddle-wheelers are the paddles. One I've been on had
its paddle-wheels run by pumps. Pump line ran out of the engine room and terminated in a smallish box next to/attached to the wheel's axle. Would that idea work for aircraft. Pump driven prop? One advantage would be aerodynamic streamlining of the cowl. The nose of the plane could be almost bullet shaped ...engine might be mid plane - anywhere really. Engine's prop shaft no longer an issue. Montblack |
#2
|
|||
|
|||
Pump driven prop????
Mountblack said:-
Would that idea work for aircraft. Pump driven prop? Yes, however:- Hydrostatic drives shuch as this are fairly common in heavy construction equipment and the like however there is a problem. There is too much loss even for ordinary car use and the fuel consumption is unacceptably poor. I would guess that this would be an even more serious issue in aircraft. |
#3
|
|||
|
|||
Pump driven prop????
wrote Yes, however:- Hydrostatic drives shuch as this are fairly common in heavy construction equipment and the like however there is a problem. There is too much loss even for ordinary car use and the fuel consumption is unacceptably poor. I would guess that this would be an even more serious issue in aircraft. Indeed, there would be, and one large problem is called weight. It wo8uld be extremely heavy. Also, those loss issues bring up another problem. When you have loss, what happens to that energy? Energy can not be created or destroyed, and that energy put into loss shows up as heat. Boatloads of heat that must be dissipated, and that will take a lot of radiator, and air to go through it. That will cause wind resistance, which will slow the plane, so much as to make a biplane seem speedy. -- Jim in NC |
#4
|
|||
|
|||
Pump driven prop????
wrote in message oups.com... Mountblack said:- Would that idea work for aircraft. Pump driven prop? Yes, however:- Hydrostatic drives shuch as this are fairly common in heavy construction equipment and the like however there is a problem. There is too much loss even for ordinary car use and the fuel consumption is unacceptably poor. I would guess that this would be an even more serious issue in aircraft. not to mention heat issues due to friction and the fact that it adds another link in the chain to fail. oh, and weight. those hydraulics aint light |
#5
|
|||
|
|||
Pump driven prop????
Montblack wrote: On the stern of some paddle-wheelers are the paddles. One I've been on had its paddle-wheels run by pumps. Pump line ran out of the engine room and terminated in a smallish box next to/attached to the wheel's axle. My guess is that this offers certain advantages such as preventing the paddles from back-driving the drive train when the engine is throttled down and also making it possible to use valves to reverse the paddles direction. Such a system will also be more efficient for low speeds than for high speeds. Would that idea work for aircraft. Pump driven prop? One advantage would be aerodynamic streamlining of the cowl. The nose of the plane could be almost bullet shaped ...engine might be mid plane - anywhere really. Engine's prop shaft no longer an issue. A drive shaft is a far more efficient means to transfer mechanical energy from the engine to the prop. Consider the P-39 Airacobra. Engine was behind the pilot, the prop out in front. -- FF |
#6
|
|||
|
|||
Pump driven prop????
Too heavy to fly but....
here is a hydrostatic diesel hog though. http://www.findarticles.com/p/articl...70/ai_n8681022 "Montblack" wrote in message ... On the stern of some paddle-wheelers are the paddles. One I've been on had its paddle-wheels run by pumps. Pump line ran out of the engine room and terminated in a smallish box next to/attached to the wheel's axle. Would that idea work for aircraft. Pump driven prop? One advantage would be aerodynamic streamlining of the cowl. The nose of the plane could be almost bullet shaped ...engine might be mid plane - anywhere really. Engine's prop shaft no longer an issue. Montblack |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Why does a prop ice up so apparently readily? | Mike Rapoport | General Aviation | 3 | November 8th 05 02:52 PM |
Engine driven fuel pump necessary with gravity feed tank?? Lycoming | RonLee | Home Built | 2 | May 8th 05 06:10 PM |
Windmilling Prop & Vacuum Pump | Matt Young | Instrument Flight Rules | 14 | October 14th 04 08:08 PM |
IVO props... comments.. | Dave S | Home Built | 16 | December 6th 03 11:43 PM |
Pumping fuel backwards through an electric fuel pump | Greg Reid | Home Built | 15 | October 7th 03 07:09 PM |