Subject: Gearbox Ford Parts
From: rotaryeng
Date: 3/1/2014, 1:45 AM
To: AAA-rotaryeng




     The left photo is of an Al Ford 9¨ carrier. Strong and well
developed. Lots of ratios available. The problem with these is the gear
cut takes more HP to turn them. That is the difference compared to the
Ford8.8 diffs.

     The sprint car racing diff is a nice piece, but expensive due to
limited market. It also has the quick change ability built in which you
do not need and it adds weight.

     Available from FRPP is the diff housing from the Ford IRS system.
     They do not recommend more gear than 3.27 but that is for cars.
Guys running 3.73 or 4.10 will have a tendency to let her rip now and
then which puts a high shock load on things. In the helicopter it is a
high but continuous load. It is fairly inexpensive and a 4.3 ratio
should be able to be installed. It should also be fairly simple to
devise a cap for the lower end when turned on its side so oil can not
leak out past a flooded seal. Then with a primary 3.17 planetary
reduction made from the Ford planetary parts. will get you 13.6
reduction which is close to your original 14:1. An over run or one way
sprag clutch will look after engine out if required to auto rotate. Cost
on this should be fairly reasonable compared to other options.

     Just looked at the FRPP website and do not see the IRS housing any
more. Should be able to get from the parts dept as they were used in the
Mustang Cobra and Lincoln. Recyclers have complete IRS for about $1500.
You may be able to part out just the diff assy. Found the FRPP housing
on the Summit web page

     Heidts also makes an IRS Al housing to use the 9¨ diff parts. Al
pumpkins available also.

     Then there is the Jaguar IRS which are readily available.

     Dale Davies


     Paul and friends,

     How do we know the rated rpm and torque for the Ford planetary system?
     Do we know the material used for making them?  It would be rather
hard to decide on which gear fits which application without such data.

     Gordon Gao

     No I do not. All I know is it it used in the Ford power stroke
diesel truck.

     650 ft pounds of torque.

     Paul Lamar




     Hello all,

     Many thanks for all your suggestions and help I am sure it will all
be of value to me shortly

     The actual torque of my helicopter is being calculated this weekend
and the greatest torque will be

     At full cyclic (so I have been informed), all will be taken into
consideration, however if the sprint car box has been used in the

     Jet Exec Kit then it is possible to find something already
manufactured for my Scorpion Mazda 200hp Turbo.

     The only thing I would look for would be a pinion which is central
to the shaft(axel/spool)

     If anyone knows of something I would be very grateful.


     Many Thanks

     George  Crooks from Aus

     IMHO the sprint car stuff is OK for a piston engine as generally
     they are much lower RPM. In the range of 2700 to 5000.

     For a rotary powered helicopter it is hard to beat a 20:1 worm gear
as we are talking 7500 to 8000 rotary RPM to get a decent power to
weight ratio.

     Most turbine engines come with built in planetary reductions
     so the out put is n the prop RPM range. In that case a sprint car
rear end
     would be useful.

     If you want a rotary powered helicopter that out performs
     the common piston engine helicopter take advantage of the high
power to
     weight ratio, high RPM of the Mazda rotary engine. It will
     beat the turbine helicopter hands down on lower fuel burn.


     Paul Lamar

     Gordon,  The E40D  4 pinion planetary s are made from hobbed
(machined) gears and also from powder metallurgy (sintered).  All the 6
pinion
     planetary s which you would be using  are machined as far as I am
aware.


  George Grimes


I do not know they are made from sintered gear, really an unbelievable
deal.  We can just order a whole set from Slauson? Or do we have to buy
from a Ford dealer?  I know Paul sold one a while ago, but that was a
one off deal.  I did not follow the whole thing from the beginning, but
are there prop shafts offered to the group? I might need one that is
driven by the carrier.

Best regards,

Gordon from China

I can order them from Slauson. I am in Germany right now so when I get
back on Monday
I will order 2. One set for Neal and one for you. What part of China are
you in. Henry is in
shenzing.

Paul Lamar


Thanks a lot Paul, I live in Beijing.  I just called a friend who is an auto mechanic, and he said the stuff is also available locally. He wishes to order a set for me from Ford. However, the Ford guys asked him the Ford part numbers, not the Slauson numbers. Do you know the part numbers?  I was told that they need the number of teeth, whether it would be 50, or 51 teeth, etc, not sure if the information is correct.


Best regards,

Gordon


The cost is $200 US but the part number in the slauson catalog is not the same as the Ford part
number.

I will have to look into what it cost to ship to Beijing. Maybe DHL but PP might be cheaper.
Everything goes by air so there is not a lot of difference in time.

Paul Lamar

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