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Guest Message by DevFuse
 

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RAM EA81 airplane part


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24 replies to this topic

#1 Phizinza

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Posted 09 December 2005 - 11:38 PM

Look at what I'm on about here To save USMB some band width

I saw this on the RAM engines site. Thought, maybe a crawler gear setup for a offroad subie? Just plug the output on a subie clutch and gearbox. And you have half'd your end gear ratio? Also good for lifted rigs? As the output is lower then the imput. Probably the only draw back, $XXX? Have we covered this option on USMB before? Just thought I'd share this with all, because all those posts Scott posted.


#2 Scott in Bellingham

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Posted 10 December 2005 - 01:13 AM

Ive been looking at some of the redrives mostly the belt type , I think it has potentual, one drawback is its one gear not a hi or low

#3 Phizinza

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Posted 10 December 2005 - 04:03 AM

But you would have a deul range in the gearbox anyhow. Isn't it just asking a bit much to have this add-on adjustible. Screw on-road driving anyhow! :D

#4 Scott in Bellingham

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Posted 10 December 2005 - 10:58 AM

But you would have a deul range in the gearbox anyhow. Isn't it just asking a bit much to have this add-on adjustible. Screw on-road driving anyhow! :D


your right

#5 Mike W

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Posted 10 December 2005 - 12:02 PM

Just need to go to the experiment aircraft airshow at Arlington and wait for one to fall out of the sky. Man that's morbid. Bad Mike.

#6 FlyB0y

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Posted 10 December 2005 - 12:45 PM

wow! that sounds great! .... errr what IS it? *edit* ok I got it now ... it's a gearbox ... how would you put this on with your reg tranny?

I love the sound of cuting the gear ratio in half, but I am confused as too how exactly it attaches... and at my current set-up with a weber'd ea81, I no longer have a 4th or 5th gear ... I have two over-drives! :-p so, I don't think that cutting my gear ratio in half would hurt me much ... how much is it? might it be easier than adding on a set of nissan T-cases?

#7 Mike W

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Posted 10 December 2005 - 02:18 PM

That RAM redrive is pretty cool, nicer thank most I've seen. Would be sweet to slip one between engine and trans. Maybe NSI at Arlington has an EA81 redrive unit laying around they'd sell for cheap? Probably not...if it flies it costs. But maybe they get too worn and tired to fly, but still good enough for land use? Here's a couple of lists of aircraft conversion vendors incase anyone wants to troll for redrives. Powerplants
Engine Accessories
If I was rollin in cash, I'd like to put one of those Klune V reduction boxes between the trans and divorced t/c. Pics and article here: Klune V

#8 Scott in Bellingham

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Posted 10 December 2005 - 08:19 PM

just a thought does this airplane redrive reverse the direction , or keep it normal ?

#9 Phizinza

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Posted 10 December 2005 - 09:28 PM

just a thought does this airplane redrive reverse the direction , or keep it normal ?


Good point. Heres more info about it http://www.autoflight.co.nz

I'm going to go have a look now.

As for fitting it, what I would do is bolt it to the engine,probably put the flywheel and clutch on the out put side of it (keeping it in the trans side of the flywheel housing. And if I were really surius, I'd get a engine side flywheel casing and build the "gearbox" into it. I just asked the NZ autoflight guys how much it would cost plus shipping to AUS. I asked RAM, but they told me to save some money and goto the autoflight site itself.

Time to go find out if it stuffs up the direction.

On a side note, I'm lucky to be on my computer right now, last night my hard drive turned itself off while in windows. Then the computer crashed, I had to do a complete reinstall. Lost all my emails and stuff, but cos I keep all my important files on another partition I still have most of it. Just took me 5 hours last nigh fixing this damn thing :( Glad I know quite a bit about computers.

#10 P K

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Posted 10 December 2005 - 10:14 PM

Thinking of a Sube application is cool.
I would first find out about the reverse drive... but then:
Consider that these assemblies are designed for a propeller cutting through air. Its case, bearings and gears may not be up to the load that will exist between an engine and pavement, let alone the variations of transmission or tires. It may completely blow apart in 1st gear - dunno??

#11 waimaks

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Posted 10 December 2005 - 10:47 PM

Specs
They say its rated to 160 hp output, must be decently tough.

#12 NorthWet

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Posted 11 December 2005 - 12:13 AM

Thinking of a Sube application is cool.
I would first find out about the reverse drive... but then:
Consider that these assemblies are designed for a propeller cutting through air. Its case, bearings and gears may not be up to the load that will exist between an engine and pavement, let alone the variations of transmission or tires. It may completely blow apart in 1st gear - dunno??

At a propeller's designed speed, air is approaching its compressability limits... tires on pavement might provide LESS load and stress...

#13 Phizinza

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Posted 11 December 2005 - 09:35 AM

tires on pavement might provide LESS load and stress...

Yes, but on-road gives more shock stress. And you are always letting out the clutch, where as this device in a plane would only have to start up once, and then its smooth running from there. So the question is, will it take shock? Something to ask the manufactures. It has to be tough and reliable to go in a plane. But who knows.

#14 Phizinza

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Posted 18 January 2006 - 04:31 AM

Yes, it does reverse direction :(

Damn! also its $3200AUD.

#15 scrap487

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Posted 18 January 2006 - 05:07 AM

yeah its been discussed before... but that does bring a couple interesting ideas to mind... possible rear engine 4x4? dual engine rig? take an extra engine and mount it on the hood or in the back where the hatch used to be and put a prop on it? kind of an interesting idea actually.. would be waaay heavy but...

Attached Files



#16 baccaruda

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Posted 18 January 2006 - 05:22 AM

would the air have time to compress before it is displaced off to the side of the blade?



At a propeller's designed speed, air is approaching its compressability limits... tires on pavement might provide LESS load and stress...



#17 grossgary

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Posted 18 January 2006 - 07:25 AM

for these redrive systems, maybe there are other vendors or fabricators that could design what you guys are looking for that isn't intended for flying ($$$$). there are industrial, farm and other gear driven applications that might be more economical. has to be someone out there that can make something like this for the trail.

on to more boring and off topicing stuff

would the air have time to compress before it is displaced off to the side of the blade?


air isn't "deflected" by the curvature of the blade. it locally speeds up across the blade (or wing - cross section of a wing and propellor are similar) creating a pressure difference between the front and back (or top and bottom of a wing) which creates the thrust (or lift). if it were only
displaced or redirected so to speak it wouldn't do anything. this is cool ....imagine squeezing your garden hose to make it come out faster (air and water are both fluids to engineers). picture the "humps" in the wing of an airplace (similar design to a propellor) as your finger on the garden hose. at the very tip of the wing you're not really pressing the hose much. then towards the middle "the hump" is where you're pressing hard and the water is coming out much faster. picture an imaginary wall 1 foot above the wing, the air is confined between the wing and this wall as it travels front to back speeding up just like your garden hose as you squeeze it. as velocity increases pressure must decrease (physics, etc). so the velocity increases and pressure decreases on the top. but the bottom of the wing is flat so the pressure remains about the same....so the pressure decrease on the top means the bottom is at a higher pressure and that creates lift. that simple (well, not really) principle is what lifts airplanes weighing in at 100's of thousands of pounds. crazy huh?

in terms of compressing the air into a smaller area yes, but in terms of compressing the density i don't think that has much impact in terms of drag on these applications. in this instance drag is typically regarded as a function of the boundary layer seperation which does increase with increasing density (compressibility so to speak), but that is one of a number of factors in the Reynolds number which is the value of interest in most aerodynamic analysis. i would guess props are designed for limited boundary layer separation and any that did occur would be isolated to the tip (highest localized speeds).

#18 mtsmiths

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Posted 18 January 2006 - 08:29 AM

"....so the pressure decrease on the top means the bottom is at a higher pressure and that creates lift. that simple (well, not really) principle is what lifts airplanes weighing in at 100's of thousands of pounds ...."

Or, to restate the concept in it's simplest state, "the wind don't BLOW, it SUCKS.

Also true of weather my friends.

Admirable explanation grossgary, but my version is easier to rremember for the FAA written.

#19 monstaru

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Posted 18 January 2006 - 08:40 AM

if you mounted a redrive of this sort, their would be no tranny.we would want an adapter redrive .kinda like an "inbetween" gearbox .they make those for combines,tractor pto's ....things like that.the hard part is finding a case that fits.would have to make one.


we could really make our own transfer cases.for mount inbetween the tranny and engine.a bolt on affair.all we need is a reduction gearing .

#20 ben--ny

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Posted 18 January 2006 - 11:29 AM

yes there are other redrives or gear boxes out there.

hirth makes 2 the g50 and the g40
rotax makes a few b- box, c- box
all sell different gears to channge ratios like 2to 1, 2.5 to 1, 3.6 to 1

#21 burtonsnowman

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Posted 18 January 2006 - 02:03 PM

http://www.ultimates...0&stc=1&thumb=1

That is one of, if not the best drawings I have EVER SEEN!

#22 Phizinza

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Posted 18 January 2006 - 11:07 PM

Hmmm... not good on your arrival time down a steep slope. might bend a few props

( sorry about speeling, its 33degrees C in my house :eek::-\:(:rolleyes: )

#23 Jibs

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Posted 22 March 2006 - 08:56 PM

bump for more discussion/ideas.:)

#24 scrap487

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Posted 23 March 2006 - 01:51 AM

uhhh... rear engine might be cool

there was a job opening for a PTO counter person at six states, truck/driveline shop, they do a lot of other stuff there too dealing with almost anything in the drivetrain from the clutch/transmission to the hubs. would have been able to get a LOT of information for us... maybe they're still taking applications. being able to get parts at COST, and all the differant parts they can get in or even make, and having a machine shop, and all the incredible number of books and catalogs... ughhh I wish I had applied

#25 Scott in Bellingham

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Posted 23 March 2006 - 09:02 AM

:brow: anyone know about maybe boat drives ?, trannys ? had this thougt pull the engine, lift the car , set the engine back in backwards above the tranny and run a transfer reduction of sorts from the engine down to the tranny, it would have to reverse the drive and a 3-1, or 4-1 reduction would be nice :cool: :eek: :brow:




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