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Post Info TOPIC: Geometry help please
4SPEED427


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Geometry help please
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In the picture, "A" is 84", or 7' long.

"B" is 31.5" tall.

The bottom right corner is a 90 degree corner.

With only this information, is there any way that I can calculate the angle (degrees) of C? It's easy to figure out the length, but I don't know how to calculate the slope.

Thanks in advance if you can help!



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
427carl


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If you put a (sounds like) pro-tractor on the drawing, and measure the angle?

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4SPEED427


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Can't find mine. Also can't find my angle meter for measuring driveshafts. I think I remember lending it out, and if so, I know where it is. I know there must be an equation to figure this one out though, and I "may" have" figured out that equation.

My answer is about 17 degrees, so we'll see if I'm right.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
4SPEED427


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I got an answer on another forum that said approx 20 degrees. I used a formula since I came up with a theory and I got 16.875 degrees.

Next question, how much pull is required to pull a 400 pound load (assuming zero friction, which I know is not possible) up that slope?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Canadian Poncho


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I believe slope equals rise over run, so slope = B/A .I get .375. Get the arctangent value of this number to get the angle. You need a calculator with an "arc" function(if you use the windows calculator, select "Scientific" and click on the "INV" box and then hit the ARC key. I get 20.556 degrees.

Todd


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427carl


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What?   did he say!confused

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4SPEED427


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Thanks Todd. I knew there must be a math major in here, but I had no idea it was you!!! Now, part two.

Assuming zero friction, how much pull is required to pull a 400 lb load up that 20 degree slope?

I realize 0 friction is not possible, but I need to get an idea.

Thanks.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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Canadian Poncho


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That's a bit trickier. Try this site Carl. CLICK HERE

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ak 67sd


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i remember this stupid saying from school... "soh cah toa"... which is sine=opp/hypotenuse or cosine=adjacent/hypotenuse, tangent=opposite/adjacent ...depends which two peices of info you are given... i also get 20.5560

this is too much like thinking for a saturday night... i'll guess you'll need 515lbs... but i'm not sure if i need to multiply in gravitational force too... is this someones homework, or are you moving a smallblock up a ramp into the back of a pickup truck?!hahaha!!

ak

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4SPEED427


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This is to build a rail system at our new cabin to carry stuff from the parking lot down to the cabin. I pretty much have the rails figured out (exhaust tubing, my brother has a muffler shop!) and the trolley to ride the rails should be easy to build. I measured the rise and horizontal distance last weekend and it is the equivalent of what you see on my picture. It's about 36' rise in 100' horizontal.

Now I have to figure out how much load will be in the trolley, and how to pull it up the hill. Down will be easy!!! I think a brake drum with a manual lever should take care of the down part. Maybe I'll go disc, LOL.

There is no power there, just a generator or the 12v vehicle battery to power a winch. I don't really want to kill the battery in the truck or I will have to use the solar to recharge it. I am debating using a small electric motor but the generator is only 1400 watts. Thinking of using a Delco starter (geared WAY down) to wind up a cable.

-- Edited by Carl Stevenson at 00:13, 2008-08-24

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
427carl


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If you pull it up the slope, with your Acadian - the answer is 350 horsepower?

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ak 67sd


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maybe a small gas motor (like out of an old riding mower) with the gearbox, use the drive wheel as your pulley, so you can reduce the speed and just idle it up your slope? should be able to find something cheap...

ak

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Wpg, MB to London, ON

Numbers don't match! Especially HP and ET. 
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4SPEED427


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I've been thinking about that, but I'd like to avoid having something gas powered to run it as that's just a headache when it would sit so much. The only exception is if I can run something using the generator as it gets used on a regular basis and the gas won't get stale in it.

I have been thinking electric, but I have to find out how much electric motor I can run off a 1400 watt generator. Not much, I suspect.

I have had many, many ideas on winches, gearboxes etc. but still haven't come up with an idea I really embrace.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
427carl


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Do/will you have a ATV or riding mower there?

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4SPEED427


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No, neither one. I thought of that, but no grass to cut there, it's all wild. No place to store a quad, and no $$$ to buy one!

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
427carl


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If you are bringing boat in, or letting it down, chances are you have a vehicle there.. can you use it ?   how about a winch powered by your daily driver?

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BILTIT


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ak 67sd wrote:

i remember this stupid saying from school... "soh cah toa"... which is sine=opp/hypotenuse or cosine=adjacent/hypotenuse, tangent=opposite/adjacent ...depends which two peices of info you are given... i also get 20.5560

this is too much like thinking for a saturday night... i'll guess you'll need 515lbs... but i'm not sure if i need to multiply in gravitational force too... is this someones homework, or are you moving a smallblock up a ramp into the back of a pickup truck?!hahaha!!

ak


The easiest way is to draw a free body diagram.  This will help break the slope into vectors which are used to analyze the whole system (it also takes care of the gravitational force deal).

An example:

http://www.physics247.com/physics-homework-help/slope.php

http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Dynamics/InclinePlanePhys.html

http://www.glenbrook.k12.il.us/gbssci/Phys/Class/vectors/u3l3e.html
I used to do this alot in school but am very rusty, trying to sharpen up the brain alittle.




-- Edited by BILTIT at 22:51, 2008-08-24

-- Edited by BILTIT at 22:53, 2008-08-24

-- Edited by BILTIT at 23:00, 2008-08-24

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'74 ventura with a P455. Runs 11.98's in the quarter so far, shooting for low 11's.

1980 chev pickup, 6'' lift and 36'' iroks, 10k winch, soon to have a pontiac 400 under the hood.

See my junk here:

www.putfile.com/biltit
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427carl


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How about a old fashioned Large pulley and rope..  ideagot trees there?

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BILTIT


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Why not just use a hand winch? Put some good gear reduction on it and you can get alittle exercise while moving supplies.

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'74 ventura with a P455. Runs 11.98's in the quarter so far, shooting for low 11's.

1980 chev pickup, 6'' lift and 36'' iroks, 10k winch, soon to have a pontiac 400 under the hood.

See my junk here:

www.putfile.com/biltit
427carl


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Yes biggrin

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4SPEED427


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I figured then I might as well just carry the stuff up and down the hill. Problem with that is, my back is not great and it seems to make it worse. One of the things I carry every spring and fall is a 20 horse outboard, and that one is a brute. Don't get me wrong, I'm not lazy. I have to take good care of my back.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
ak 67sd


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can you ride a bike? you could use pedal power.... i'd rather do that than hand crank....

ak

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Wpg, MB to London, ON

Numbers don't match! Especially HP and ET. 
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BILTIT


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It will have enough power if geared right, just may take awhile!

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'74 ventura with a P455. Runs 11.98's in the quarter so far, shooting for low 11's.

1980 chev pickup, 6'' lift and 36'' iroks, 10k winch, soon to have a pontiac 400 under the hood.

See my junk here:

www.putfile.com/biltit
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