taxi in reverse?

Thats a cool idea even if it goes counter to the homebuilt creed "Keep
it simple stupid." Maybe you compromise on the brake function,
keeping your brakes on the mains, and put the motor on the castering
nose gear. Steer like usual with differential braking.

That might be a lot of juice stopping a 1,000 lb airplane from 60mph
to 0 in 10 seconds. Loads are easy though, you don't have to dump
that power into your battery. Think of it the other way around, how
much power would you need to accelerate 1,000lb to 60MPH in 10
seconds?

Modern jet fighters dump waste heat from the hydraulic system into
their wing tanks. Worst case scenario, heavy manuvering on low tanks.



"James M. Knox" wrote in message ...
(Malcolm Teas) wrote in
om:

"James M. Knox" wrote in message
I always figured if I was building a homebuilt I would investigate
some relatively small motor/brake assemblies that are used on smaller
electric automobiles.

My first thought when reading this was, "sounds cool!". And I started
to think it through.

All true. Of course, I was thinking primarily in terms of taxiing only a
short distance - into or out of a hangar, for example. I haven't done the
brake calculations, but I *think* (back of the hand calculations) that the
amount of power generated stopping the plane on the runway and taxiing in
is small enough that even a "fully charged" battery can easily absorb it.

Mostly just amusing and idle speculation... But I've seen some cold rainy
days when it would sure be nice to preflight in the hangar, climb in, and
just drive out. G

-----------------------------------------------
James M. Knox
TriSoft ph 512-385-0316
1109-A Shady Lane fax 512-366-4331
Austin, Tx 78721
-----------------------------------------------

"James M. Knox" wrote in message I haven't done the
brake calculations, but I *think* (back of the hand calculations) that the
amount of power generated stopping the plane on the runway and taxiing in
is small enough that even a "fully charged" battery can easily absorb it.

The electric motor on my hybrid car is 6 cm thick and the diameter is larger
than some homebuilts' tires. It's rated for 10 hp and it's hooked into a 144
volt battery which weighs more than I do. The motor goes into regenerative
mode for braking. It recharges the battery in quick order, but it doesn't
stop the 2800 pound car very well. Based on this, I'm inclined to think that
you will still need traditional brakes.

D.

What one should use is to replace the front weel hub wtih a hub-motor
http://www.goldenmotor.com/ .
I am sure that this would not add that much weight and if the hub-motor is
selected corectly, the original tyre used, one could not distinguish it form
original.
Now, I wander if this could be installed on a certified aicraft with some
field approval as a minor modification...

"James M. Knox" wrote in message
...
(Malcolm Teas) wrote in
om:

"James M. Knox" wrote in message
I always figured if I was building a homebuilt I would investigate
some relatively small motor/brake assemblies that are used on smaller
electric automobiles.

My first thought when reading this was, "sounds cool!". And I started
to think it through.

All true. Of course, I was thinking primarily in terms of taxiing only a
short distance - into or out of a hangar, for example. I haven't done the
brake calculations, but I *think* (back of the hand calculations) that the
amount of power generated stopping the plane on the runway and taxiing in
is small enough that even a "fully charged" battery can easily absorb it.

Mostly just amusing and idle speculation... But I've seen some cold rainy
days when it would sure be nice to preflight in the hangar, climb in, and
just drive out. G

-----------------------------------------------
James M. Knox
TriSoft ph 512-385-0316
1109-A Shady Lane fax 512-366-4331
Austin, Tx 78721
-----------------------------------------------

Many jets do a power back from gates at the major airports.
All of our Aircraft can back up if necessary.
I have "witnessed" our turboprops backed into their parking spaces at
our hangar. You do not use the brakes though when backing up. They grab
and up end up doing a tail stand. (not good)
These would be a Jetstream 4100 and our Canadair Regional Jets
Michelle

wrote:

Has a fixed-wing plane ever been made that could back up under its own
power?

I once, on a flight from Bogota to MIA, sat next to an ex-FBI agent,
ex-Customs pilot, then MD for PHS.

He talked about making short field landings in a King Air by going
into reverse pitch while still 50 ft above the dirt.... ARGH!


--
A host is a host from coast to
& no one will talk to a host that's close........[v].(301) 56-LINUX
Unless the host (that isn't close).........................pob 1433
is busy, hung or dead....................................20915-1433

He talked about making short field landings in a King Air by going
into reverse pitch while still 50 ft above the dirt.... ARGH!


Known as Beta Mode in a Porter, and was used to drop from the sky at a great
rate of knots when you wanted to get down in a hurry. It has been used for
parachuting and allows the aircraft to get down faster than the jumpers.....

Also good for taxi operations.

I am considering a Storch, www.storch.com.au and have just had a great chat
with the designer about this and a few other things. Looks like I'm about to
take a trip down to see him......

Peter

David Lesher wrote:

He talked about making short field landings in a King Air by going
into reverse pitch while still 50 ft above the dirt.... ARGH!

The technique was commonly used by CIA pilots for short field insertions in SEA.

George Patterson
A diplomat is a person who can tell you to go to hell in such a way that
you look forward to the trip.