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Author Topic: Rear aarm rake  (Read 14568 times)

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Online fabr

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Re: Rear aarm rake
« Reply #15 on: January 02, 2013, 06:58:56 PM »
I believe,haven't really thought about it but,I believe you will lose a little travel with rake due to the compound angle just like with ta's.
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mr.bob

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Re: Rear aarm rake
« Reply #16 on: January 02, 2013, 07:16:00 PM »
Quote from: masterfabr on January 02, 2013, 06:58:56 PM
I believe,haven't really thought about it but,I believe you will lose a little travel with rake due to the compound angle just like with ta's.

How would it be different? Every thing would be the same with the mounts,arms and spindle.I do need to keep plunge low because Im using f-150 outer and 930 inters.any info will help
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Online fabr

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Re: Rear aarm rake
« Reply #17 on: January 02, 2013, 07:32:31 PM »
With rake you will add a second angle into the equation. It will be small and not likely significant but it will slightly reduce travel. I think.  Well, on second thought it wouldn't if the axles are perpendicular to the frame at full droop. I assume you will design it so. Soooooo, never mind. LOL!!!!!
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline Carlriddle

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Re: Rear aarm rake
« Reply #18 on: January 03, 2013, 05:20:50 AM »
I'm pretty sure you will loose some travel angle.  Look at it like a clock. No rake cv would swing from 12 to 6.  Add rake now your swinging from 1 to 7, same stroke just not quit as far down. (6 compared to 7).  And *8 would be quit that far, prob closer to 12:30 to 6:30 so lose maybe 1/2-3/4"??

What 930 cv are you planning on running on inside? And what length axles?
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Online fabr

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Re: Rear aarm rake
« Reply #19 on: January 03, 2013, 05:53:36 AM »
Carl,look at it as being at 6 o'clock at full droop with or without rake. Thenn there would be no additional angle to consider.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
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the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline Carlriddle

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Re: Rear aarm rake
« Reply #20 on: January 03, 2013, 08:37:07 AM »
Quote from: masterfabr on January 03, 2013, 05:53:36 AM
Carl,look at it as being at 6 o'clock at full droop with or without rake. Thenn there would be no additional angle to consider.

Agree.  But if rake and you set droop at 6 for max travel then some plunge would be induced as it cycled up.  Certainly no more than any plunging 930 could handle.
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LiveWire

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Re: Rear aarm rake
« Reply #21 on: January 03, 2013, 09:50:07 AM »
If you had 18" of suspension travel clocked 8 degrees, you would have 17.825" of vertical travel.
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mr.bob

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Re: Rear aarm rake
« Reply #22 on: January 03, 2013, 09:58:05 AM »
ok I see, it will take away from droop.Not that it would be less movement but higher so less droop=less travel.
The cvs are from protodie race prep 930s.
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Online fabr

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Re: Rear aarm rake
« Reply #23 on: January 03, 2013, 11:13:35 AM »
Something to consider is just how much travel is needed. IMO,many cars have more than is needed. How wide is your rear ,flange to flange?
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the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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LiveWire

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Re: Rear aarm rake
« Reply #24 on: January 03, 2013, 02:14:08 PM »
My point was that the difference in travel is insignificant. With a trailing arm machine, the wheel moves in an arc so it has a significant amount of rake at full droop where quite a bit of travel can be lost. I think some rake/anti squat is good, but is only needed at ride height. That is all speaking in terms of a fixed amount of travel applied vertically or at an angle. It is rare to build a buggy that will utilize all the angle of the CV at full bump and very common at full droop. So CV angle is usually the limiting factor. If you start with level A-arms and a shaft straight out at ride height then rotate the entire assembly to get rake, you'll lose a very small amount of vertical travel. If you want to get anal about it, you can reposition the bearing carrier in such a way as at full droop, the outer CV is still straight out from the inner instead of forward of it. That will give you the exact same droop as without rake. At ride height, the outer CV will then be behind the inner, but won't affect travel. At full bump, the outer CV will be even farther behind the inner which would limit the travel if the CV angle is actually binding, but likely won't be.
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Online fabr

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Re: Rear aarm rake
« Reply #25 on: January 03, 2013, 05:43:00 PM »
But if you design it so all 4 cv's ,at full droop, are in line (same plane) there will be no loss of travel rake or not.
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but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

mr.bob

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Re: Rear aarm rake
« Reply #26 on: January 03, 2013, 08:46:13 PM »
Quote from: masterfabr on January 03, 2013, 11:13:35 AM
Something to consider is just how much travel is needed. IMO,many cars have more than is needed. How wide is your rear ,flange to flange?
the front has 23'' of travel at 70'' wide,but thats at 40* at droop on the bottom aarms and I dont know if 40* is to steep or not.
In back the spool is from protodie and I think its 6'' wide,I havent got axles yet or built anything in back. Im building the 2nd spindle and last front aarm now,mount the rack next then to the back.
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Online fabr

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Re: Rear aarm rake
« Reply #27 on: January 03, 2013, 08:52:42 PM »
Everyone seems to shoot for 20"+ but IMO most would be better concentrating on a bit less. Maybe 16-18".
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

mr.bob

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Re: Rear aarm rake
« Reply #28 on: January 03, 2013, 08:57:17 PM »
Do you thing 40* on the bottom arms is to steep? 23'' sounds good but Im with you how much do you need. I can strap it to less, Im just wondering if 40 is to much.Could it cause problems?
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Offline MC

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Re: Rear aarm rake
« Reply #29 on: January 03, 2013, 09:14:19 PM »
At 40* your arms are going in almost as much as their going down.
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