Stop!

[sled_dog]

I'd like to see someone do a big brake kit for all 4 corners. Of course, in crawling how necessary is it?

 

[cybrfire]

Eventually it comes down to how much brake do you need before you overcome the tires traction. Big tires equals bigger brakes. Heavier rigs and loads can add to the need as well.

 

[Stomper]

You know what we were talking about the other day, inregards to my lathe.
I think they just may fit.

 

[cybrfire]

You know what we were talking about the other day, inregards to my lathe.
I think they just may fit.

Actually, I solved that issue as well. Thanks for looking into it though. Pretty slick solution, when you get back up this way I'll do one if I haven't already got them all done.

 

[Drey]

Looks good kert, if not half ton chevy calipers what are then? if you dont mind me askin.

 

[jarheadk5]

As far as two independent calipers on the same rotor being bad, it's been done in other applications and I can't see any reason it won't work here as well.

Not a problem at all; thousands of commercial airliners and military jets can't all be done wrong. Hell, a lot of aircraft brakes have a separate friction "puck" or pad for each piston in the caliper.
Plumbing in many apps is simple - single line coming from the MC, hits a tee or manifold, and a separate line goes to each caliper. It can be plenty more complicated upstream (anti-skid valves, shuttle valves, etc), but at the wheel it's usually pretty simple.

 

[cybrfire]

Not a problem at all; thousands of commercial airliners and military jets can't all be done wrong. Hell, a lot of aircraft brakes have a separate friction "puck" or pad for each piston in the caliper.
Plumbing in many apps is simple - single line coming from the MC, hits a tee or manifold, and a separate line goes to each caliper. It can be plenty more complicated upstream (anti-skid valves, shuttle valves, etc), but at the wheel it's usually pretty simple.

Exactly!

 

[cybrfire]

Looks good kert, if not half ton chevy calipers what are then? if you dont mind me askin.

I don't mind you asking.

 

[guido666]

This thing is awesome.

I heard a saying once that the real test of genius is that when you look at an invention and wonder why no one thought of that before. I think this passes the test.

 

[Seventy4Blazer]

Not a problem at all; thousands of commercial airliners and military jets can't all be done wrong. Hell, a lot of aircraft brakes have a separate friction "puck" or pad for each piston in the caliper.
Plumbing in many apps is simple - single line coming from the MC, hits a tee or manifold, and a separate line goes to each caliper. It can be plenty more complicated upstream (anti-skid valves, shuttle valves, etc), but at the wheel it's usually pretty simple.

our main rotor blade/transmission brake is 2 disks and 4 twin pistion calipers daisy chained together. (in series) it works great and if the handle is yanked it will dead stop the blades at ANY percentage rotation, 311 RPM at 54 feet wide at about 1000 lbs dead weight, and spin the plane about 1/3 turn..... thats some clamping force....
Grant

 

[HarryH3]

Have you calculated the total volume of the dual pistons vs. a single? Seems to me that you'll need a master cylinder that moves a lot more fluid to get both of those to move far enough to get some decent clamping force.

It sure looks cool though!

 

[73k5blazer]

That look really nice. Nice work!
Yeah, I agree on the master thing, it will need more fluid to push those. Mabey just a bigger resevoir. Probably want hydroboost too.

 

[ntsqd]

snip......
As far as two independent calipers on the same rotoro being bad, it's been done in other applications and I can't see any reason it won't work here as well. On the other hand there could be a scenario when one caliper would "hang up" and may cause some problems. That has been considered but since this is a prototype, I'll cross that bridge when it falls down!

Was common a long time ago in Formula 1.

Have you calculated the total volume of the dual pistons vs. a single? Seems to me that you'll need a master cylinder that moves a lot more fluid to get both of those to move far enough to get some decent clamping force.

SOP guess based on doing these calcs in the past is that the m/c is going to need to be ~1.5" if the pedal stroke isn't to be long. When I get home I can plug this into a spreadsheet I've got and see what it really will need to be.
I'd be thinking in terms of a Tilton type balance bar hanging off the front of an HB. That would put you into two different parallel M/C's which should shorten the pedal stroke to something reasonable.

 

[mikey_d05]

Kert, I have an excel spreadsheet I can send you if you want to plug in a few numbers to try and figure out what you'll need for the bore of the master.

 

[steve_kibbe]

I'd like to see someone do a big brake kit for all 4 corners. Of course, in crawling how necessary is it?

Just have to buy larger wheels, and newer style tires to accommodate them.

No more 15's or 16's, or even 16.5's for that matter

 

[cybrfire]

Thanks for all the kinds words guys. Always appreciated!

I'd like to see some of the spread sheets and such. I did some quick figuring and it is going on a hydro boost truck. Master cylinder may need to be played with.

 

[ntsqd]

Plugged this into my spreadsheet and I was surprised. With no booster at all, a 7:1 pedal ratio, and a 1.375" bore m/c it could work for the front. Typically you need less pressure at the rear, but how much depends on what the loading is.
The potential problem is that with a 7:1 pedal ratio just taking up the slight clearence btwn the pads & the rotors could use as much as 3.8" of the pedal's stroke.
I highly doubt the stock pedal is that high of a ratio, which is good news. Power brake pedal ratios tend to be in the 3:1 to 5:1 range. Am interested to hear how this all works out.

 

[camiswelding]

the p30 4wdb master sounds perfect for this application....

and I just happen to have it installed in my hydroboost dually truck

how about some prototypes to test???

cam

 

[cybrfire]

Should be able to make some more progess on this in the next week or so.

 

[darkshadow]

wow, that is some cool thinking, not your every day aplacation, but damn makes me want one out of sheer coolness factor!