BMI COPPERHEAD 12R

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Old 01-23-2013, 01:56 PM
  #106  
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Looks good so far, can't wait to see the rest.
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Old 01-23-2013, 01:56 PM
  #107  
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I am waiting to see who has a detailed eye and can see the enhancements made to the car over existing car kits on the market. The majority of the really unique parts are not on the car and I am going to have to wait until the car is complete before posting pics but there are some things in the pics that will take a little bit to notice. If anyone has questions, I will be happy to answer.
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Old 01-23-2013, 01:56 PM
  #108  
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Oh wow! When you said in-line I was thinking more like the 12R5 with it off-set by the electronics...not this. I love it! How long have I been asking you to build an in-line car? hehehe Can't wait to see the front end!
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Old 01-23-2013, 02:09 PM
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Originally Posted by protc3 View Post
I am waiting to see who has a detailed eye and can see the enhancements made to the car over existing car kits on the market. The majority of the really unique parts are not on the car and I am going to have to wait until the car is complete before posting pics but there are some things in the pics that will take a little bit to notice. If anyone has questions, I will be happy to answer.
Well first off I'd have to say the bumper mount being a separate piece from the chassis. There are a few cars that do that but none of the main stream chassis. Alf does that on his cars too. It appears that the servo now mounts centered between the front suspension instead of off-set which will make the balance better on the car. That is if I guessed the holes right. Could be part of the suspension mounting too I guess. Not sure what the hole off to the left and the double hole in the center is for...unless that is for the servo which would make sense...but that would mean the servo is turned around the opposite way of normal. I really like having the antenna mount separate from the shock mount. I see droop stop ears on the chassis

I see you went away from your machined center pivot and are using the AE one...I assume that is to help keep the cost down. What I don't see are the flex links. Are those gone now or will that still be an option?

Also is that the 1 cell battery you'll be carrying?
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Old 01-23-2013, 02:17 PM
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Oh and of course the chassis being narrowed won't drag when it rolls...as you have already mentioned.
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Old 01-23-2013, 02:20 PM
  #111  
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Originally Posted by InspGadgt View Post
Well first off I'd have to say the bumper mount being a separate piece from the chassis. There are a few cars that do that but none of the main stream chassis. Alf does that on his cars too. It appears that the servo now mounts centered between the front suspension instead of off-set which will make the balance better on the car. That is if I guessed the holes right. Could be part of the suspension mounting too I guess. Not sure what the hole off to the left and the double hole in the center is for...unless that is for the servo which would make sense...but that would mean the servo is turned around the opposite way of normal. I really like having the antenna mount separate from the shock mount. I see droop stop ears on the chassis

I see you went away from your machined center pivot and are using the AE one...I assume that is to help keep the cost down. What I don't see are the flex links. Are those gone now or will that still be an option?

Also is that the 1 cell battery you'll be carrying?
I did seperate the chassis and body post mounting area. I reduced the width up front even more by angling the front. This shortens the surface closest to the ground and will virtually eliminate touch downs which hurt corner speed. The servo doesnt mount up front but off to the side. It will counter balance the speedo. The steering rack is centered in the car. I used the AE pivot to reduce cost and also to make it so people can get some common replacement parts at any track. The links and springs will be standard and flex plates are going to be an option part. The rear of the chassis is also extremely narrow as the front and rear are the 2 spots that always touch the ground. The overall car is much more narrow that most all of the cars available. I went centralized battery but added a little outboard weight with the servo and speedo. Its not much but is really one of the things that keeps this car drivable in all classes and keeps the car a little more flat. Transition speed is insane but not crazy twitchy. I was very pleased with the handling and drivability of the car along with how free it is in the corners.
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Old 01-23-2013, 02:29 PM
  #112  
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When all is said and done, I will post high quality pics to show the details. Everything for the most part is machined on this car with the exception of the center pivot and links. The whole front end including the arms will be machined.
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Old 01-23-2013, 02:32 PM
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It may be an illusion from the camera angle, but it looks as if the side link rear pivot balls are positioned farther back than the centerline of the middle pivot ball. Perhaps something to do with the angled side links and the geometry of pivoting the rear pod freely? It also looks as if the intent is to mount speedo on the right side of the chassis and the servo 'lengthwise' on the left side, with a center mounted bellcrank to activiate the tie rods.
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Old 01-23-2013, 02:50 PM
  #114  
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Originally Posted by vafactor View Post
It may be an illusion from the camera angle, but it looks as if the side link rear pivot balls are positioned farther back than the centerline of the middle pivot ball. Perhaps something to do with the angled side links and the geometry of pivoting the rear pod freely? It also looks as if the intent is to mount speedo on the right side of the chassis and the servo 'lengthwise' on the left side, with a center mounted bellcrank to activiate the tie rods.
The pivot balls are all in line. The camera phone doesnt take the best pics. the servo mounts with the servo horn facing the front of the car or parallel to the axles with the speedo on the right and steering belcrannk in the center like you said. Good eye guys.
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Old 01-23-2013, 02:50 PM
  #115  
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The only issue I see here, is the rear pod piece on the spur side where there is very little material between the forward screw hole and either side of it. I know on my DB12RR I eventually cracked that piece of CF because the screw would keep wearing into the CF there, eventually breaking it.

Otherwise I am digging it. I like the separate front bumper piece, I have the same on my 2 V-Dezign cars.

The front end suspension mounts are also something that peaked my interest. These are keeping with the 8-32 screws? And if so are they going to the much more shallow flat head counter sunk screws and not the deep angled screws you used in the past? (which are impossible to find replacements for since everyone else uses/used the shallow ones. Which includes the only Ti options for those screws) Why not 3mm screws like most everyone else has gone to?
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Old 01-23-2013, 02:54 PM
  #116  
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So it looks like the servo mounts with the spline facing backwards or are the servo mounts long? Possibly a low profile servo setup?
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Old 01-23-2013, 02:59 PM
  #117  
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Originally Posted by Clegg View Post
The only issue I see here, is the rear pod piece on the spur side where there is very little material between the forward screw hole and either side of it. I know on my DB12RR I eventually cracked that piece of CF because the screw would keep wearing into the CF there, eventually breaking it.

Otherwise I am digging it. I like the separate front bumper piece, I have the same on my 2 V-Dezign cars.

The front end suspension mounts are also something that peaked my interest. These are keeping with the 8-32 screws? And if so are they going to the much more shallow flat head counter sunk screws and not the deep angled screws you used in the past? (which are impossible to find replacements for since everyone else uses/used the shallow ones. Which includes the only Ti options for those screws) Why not 3mm screws like most everyone else has gone to?

Another camera trick. There are no 8-32 screws on the car. Also on the rear lower pod, I have to allow for the motor to slide forward so I added material on the outside like I did on the CH12 to strengthen the plate. That pretty much eliminated breakage. Along with that the structure of the rear pod is very strong. Stronger than anything I have made in the past. Mounting screws have been relocated to high impact areas and reinforcements added to high impact areas. This is going to be one stout pod.
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Old 01-23-2013, 03:00 PM
  #118  
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Originally Posted by InspGadgt View Post
So it looks like the servo mounts with the spline facing backwards or are the servo mounts long? Possibly a low profile servo setup?
I based the servo location on my JR Z3650 servo size. I can tweak it if need be. The servo saver faces the front of the car.
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Old 01-23-2013, 03:07 PM
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the little tabs sticking out on the sides of the chassis plate up front indicate a landing spot for some sort of droop screw.......which would indicate the potential for some sort of double wishbone front suspension and not the traditional sliding kingpin.
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Old 01-23-2013, 03:10 PM
  #120  
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Originally Posted by vafactor View Post
the little tabs sticking out on the sides of the chassis plate up front indicate a landing spot for some sort of droop screw.......which would indicate the potential for some sort of double wishbone front suspension and not the traditional sliding kingpin.
That is correct. It is going to be a C-Hub double wishbone with 2 mini threaded bladder shocks.
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