BTW do you or anybody else on here know anything about the HP
capability of J section belts at 6000 RPM?
Paul Lamar
Paul, It depends on the number of ribs of course, but Gates has
charts for them. Go ti the Gates web site and search Micro-V. J
section is fairly small. K might be better for power transmission.
Bill Jepson
I did but I found no engineering manual. They wanted me to contact
them and they wanted a bunch of info. If you have a pdf please email
it.
The only thing I could download was this chart. I want to operate in
the red box so I know I need a J section. What about pulley diameters
for that range?
Paul Lamar
Paul, In j section all the pulleys you might normally use would be
fine. I believe the minimum radius suggested is about 2 inches. I
would stay up around 4 inches for power transmission. Bill
How many do you think I need to trans mitt 50 HP? Would a cog belt
be better? Some of those blower drives are well over 50 HP.
Paul Lamar
Yes Paul, for 50 hp. You would do well to consider a tooth belt
drive. A
multi-rib design would get really wide to handle that much power. A j
section belt would be at least 3-4 inches wide. One of the carbon
fiber
backed[cog] belts in 20 mm would likely work. I checked the gates
site and the 5
inch diameter pulleys with 20 mm width would handle the power.
The biggest
trouble is speed. They suggest a max belt speed of 6500 fpm. A 5"
pulley at
6000 rpm is 7800 fpm. What rpm do you expect at the output?
Bill
I'll be surprised if we get over 6500 RPM with Tracy's old
2.17:1 gear box and a wood Warnecki prop. My guess is we will have
close to 400 HP over all. Acid test for the old four pinion gear
box:)
I'll put a new rubber coupling in it. No use in destroying a
perfectly
good flex plate :) I was going to change the gear box in the RV4
to a 2.85:1 anyway.
Maybe two 20 mm wide on a 4.5 inch cog pulley.
Paul Lamar
Paul,
The gates catalog for the Polychain GT Carbon says a 5" diameter
sprocket
can transmit 115 hp in a 20 mm belt @ 4000 rpm. The problem isn't
the belt
width it is the belt SPEED. If you keep to the limiting speed
suggested of
6500 feet per minute, a 5" diameter pulley should be limited to
4,969 rpm.
If you can deal with under 5000 rpm on the fastest pulley a
single 20 mm
belt should be fine.
Bill Jepson
Here is the turbo compound dyno engine test mount.
I have a friend in the cabinet biz and he turned me on to this super
strong and super stiff sandwich material. When bonded to cheap
galvanized thin HVAC steel sheet on both sides it becomes cannon
prof.
The alternative would be a steel space frame welded or bolted.
That would take a lot more time to construct.
We just cut the parts out on his huge table saw and
drywall screw them together. It is also easy to cut holes
in it with a saber saw for the cooling system.
Paul Lamar
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