Arc length / Geometry, Anyone smart?

[78Class3]

I've got all the #'s to solve this suspension geometry problem but don't have the brains to do it anymore. I'm looking for the length of B to B. I think angle Q is approx 11 degrees (but really not sure how i got that answer ). I've been plugging away at this for hours now and keep getting different answers. I want to know how far the coilover (B) will move if the limit strap(A) moves / bottoms out after 2". It is 10" further away from the pivot point (0) being the radius arm hiem joint. I think its crazy how i used to have to know this junk for tests in high school/college, I guess i should have paid more attention.hahaha

[Copykat]

Q is actually 3.4°

for 2" travel at A-A travel at B-B is 2.6"

CAD is an awesome tool. No math required.

[Phoenix0783]

Just take the ratio of the two distances and multiply by how much they move.
OB/OA * 2 = 2.6"

You can flip OB and OA if you want to know how far A moves if B moves 2 inches.

[78Class3]

aaahh, thanks guys. I acutally had Q of 3.4 from one formula but got the 11 from another. Looks like i need a longer limit strap. Thanks again

[trophygirl]

Your second limit strap is less than .6" longer than the first?

[trophygirl]

Oh, wait. You just want your coilover to travel more...?

[78Class3]

Yes, i need a longer limit strap at A so that the coilover (B) will have more droop.

[PaulW]

Q is actually 3.4°

for 2" travel at A-A travel at B-B is 2.6"

CAD is an awesome tool. No math required.

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Confirmed from the math handbook . The arc length is 2.606"
PaulW

[ChaseTruck754]

CAD is an awesome tool. No math required.

Yup - I LOVE the fact that I had to learn it for work when it comes in handy for fun, truck stuff like this. I use cad all the time to solve math problems I lack the brains to do the "real" way...

[shockseals.com]

I am late to the party but a quick scan I didnt see an arc length formula, just answers.

S=R X Theta
S is arch length
R is leg
Theta is angle in radians

[shockseals.com]

Just take the ratio of the two distances and multiply by how much they move.
OB/OA * 2 = 2.6"

You can flip OB and OA if you want to know how far A moves if B moves 2 inches.

Remember that this works for right triangles only...

[Phoenix0783]

Just take the ratio of the two distances and multiply by how much they move.
OB/OA * 2 = 2.6"

You can flip OB and OA if you want to know how far A moves if B moves 2 inches.

Remember that this works for right triangles only...

True, but with that small angle, it ends up being close enough.