Question for Engineers here

[afterburn 549]

I have a engine that needs to run @ 48oo RPM
I need it to drive a shaft at 90 deg to engine at about 530 RPM
A rear end ( car ) would work except I dont know of anyone that makes a ring and pinion close to that ratio .
It would be too large for the housings i know of.
So. Maybe a planetary set up?
your thoughts are appreciated .
PS - I do not want use a jack shaft arrangement, as thats what i am trying to get away from.
thanx in advance !

[Red88Carrera]

How much hp and torque is required and is it a constant load?
This isn't a sawmill by any chance is it?

[afterburn 549]

Originally Posted by Red88Carrera

How much hp and torque is required and is it a constant load?

150 pounds constant. No more

[Red88Carrera]

Is that ft, or in?

[Flieger]

I hate to say it, but that appears to have been the reason for the belts and/or jackshafts. All a planetary is is a jackshaft.

[afterburn 549]

150 pounds TQ
The belts a and chains and shafts are prone to breaking.
With a planetary or way to reduce RPM all this crap could be done away with.
It would make a simple clean set up.
Engine powr in a 90 deg shaft
power out.
It would get rid of over 13 belts ! 6 off the engine to the jack shaft alone !
And the maintenance , H.S. !

[Red88Carrera]

If this has anything to do with aviation, I'm not qualified to comment.

[afterburn 549]

Its all experimental so there is no liability, just conversation here.
just need to locate a planetary of sorts.

[Jim2]

Being a Porsche forum... I'd suggest a 901 or 915 transaxle with a 8:31 3.875 diff and (edit) 2.33 second (or a 7:31 4.43 diff and 2.0 2nd). Weld the diff, gut any unused parts.

edit: I transposed the ratio numbers

[Flieger]

Originally Posted by afterburn 549

Its all experimental so there is no liability, just conversation here.
just need to locate a planetary of sorts.

I don't think a planetary would be any better than a jackshaft so you can do a 2 stage reduction. You should be able to get the necessary reduction with 1 spur or helical gear stage and 1 bevel gear stage.

[Red88Carrera]

Originally Posted by Flieger

I don't think a planetary would be any better than a jackshaft so you can do a 2 stage reduction. You should be able to get the necessary reduction with 1 spur or helical gear stage and 1 bevel gear stage.

Planetary, spur, helical... now your talkin dirty to me. I work for a company that manufactures machines that cut these gears.

[slodave]

Why are you starting another thread on this? Was there something wrong with this one?
Belt / pulley engineers

How about this one?
Calling all helicopter engineers.

[afterburn 549]

Originally Posted by Flieger

I don't think a planetary would be any better than a jackshaft so you can do a 2 stage reduction. You should be able to get the necessary reduction with 1 spur or helical gear stage and 1 bevel gear stage.

What does this gizmo look like?
Is there a vendor for such a thing , or do i build it from scratch?

[Flieger]

Originally Posted by afterburn 549

What does this gizmo look like?
Is there a vendor for such a thing , or do i build it from scratch?

You should be able to get 2 gearboxes (one bevel with shafts 90 degrees to each other and one spur with the shafts parallel and offset, or even colinear) and mate them together.

[Flieger]

Or you could go with the other suggestion and use 915 and take all but one gear out and replace the diff with a spool.

[gordner]

Just remember that the reason you are removing so many belts and pulleys is redundancy, and your system will have none. Nothing in aviation does a job on its own with no backup.

[sammyg2]

I suggest you make friends with your local reps from Applied industrial technologies or Kaman industrial technologies.
My local reps are Jim Sullivan and Dave Lester, known em both for 20 years or longer.
They're more than happy to do the leg work for me.
Applied.com Industrial Supply, Industrial Bearings, Material Handling, Power Transmission, Fluid Power Products | Applied Industrial Technologies | Applied.com | Applied.com

https://ec.kamandirect.com/us/index.jsp


There have been times when I have tried to "invent" a solution that already existed. Not very cost effective.
If your local reps are worth their salt they'll show you what's available, connect you with the factory reps, offer up several options so you just need to crunch some numbers and decide which one best suits your needs.
Time is money.

[Embraer]

please don't kill yourself after you make a helicopter. im being genuine and serious.

[afterburn 549]

Geesh guys......Are we all so scared as to NOT do anything anymore.?
The crap that is installed is just that , crap, it works, but there is so much a better way.!
I do NOT want a secondary (Jack shaft) breaking on me, and thats what they are famous for.!!!!!!!!'if i get rid of this and install a real Power delivery devise, it will not break, will require no belts and chains, just a chip detector and oil sight guage.
Its the right thing to do.
This I do know

[Seahawk]

Originally Posted by Embraer

please don't kill yourself after you make a helicopter. im being genuine and serious.

As an old helo pilot with lots of flight test and maintenance flight test time, you're being foolish thinking you can redesign the load path from engines to rotor head on your own.

I spent three years at the Sikorsky Factory as the Chief Government Test Lead. I learned more about shear, Rockwell C numbers, lubrication, cooling and failure modes than I ever really wanted to know.

Transmissions are the heart of a helicopter and generally the failure point: In an H-60 there are five "transmissions" that redirect energy to the main and tail rotors.

Do not think any gearing systems designed for one application will work in yours: In aviation they call it the "wheel of misfortune": my recommendation to you is to stay off of it.