Originally Posted by JamesHealey
Also from Huraj Hudy
A typical example would be aluminum bulkheads. It may look fashionable that nitro on-road cars recently use mostly aluminum bulkheads, but in my own opinion it is primarly the cost reason. I have used aluminum bulkheads at my 1/8 on-road cars 27 (!) years ago and have the knowledge and experience to compare it. Back in the years I used aluminum bulkheads when I first started to use fully-independent suspension. Because the alu bulkheads were mounted to the aluminum chassis the vibrations were rippling through the entire car; screws without threadlock fall out and vibrations also had negative influences on the engine. At those times I made a quick fix using composite inserts between chassis and alu bulkheads to stop the vibrations. And ball-bearings were simply not working properly if they are inserted in the aluminum directly.
For this reason, all my old designs as well as with all XRAY cars where we use ball-bearings in aluminum (alu steering blocks or uprights) I have always used composite bushings to ensure that the ball-bearing is gripped in a composite hub so that the bearing works properly instead of the entire thing trying to turn within an aluminum bulkhead! Because of all these experiences I simply knew on Day 1 of RX8 design that we will have to design and produce composite bulkheads. And at the end the racing results of the NT1 where we also use composite bulkheads we have proved my theory that the composite bulkheads are simply the proper solution for nitro on-road cars."
You have to take the Hudy columns with pinch of salt.
Xray is one of the very few companies who do their production in house, they own all the machines.
If you change to aluminum bulkheads for your nitro cars you will have a part of you injection molding machines doing nothing and you don't have enough CNC-machines to keep up with production.
If you want to make the switch you will need to invest heavily, something which is difficult in the current economical situation.
So it's easier to write a column saying plastic is still the best option.
Regarding the discussion:
-More design possibilities
-Lighter when designed properly
-Durability, doesn't wear out like plastic does
-easy to change the design
-costs for end user
-Can bend without the user knowing it
-costs for end user
-doesn't tweak like aluminum
-wears out, stripped threads