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Brad Christy

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About Brad Christy

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    National Racer

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  1. Brad Christy

    Ajustible Canard Wings

    Robert, Its not so much the aero that's the problem, as far as being fragile, but the hydro. It's what happens when a boat turns into a kite and then hits the water. Planes don't usually impact water. But when they do, they come from together. As will adjustable canards. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  2. Brad Christy

    Delrin question.

    Terry, Yup. I haven't had the cajones to try it, and haven't been trying to muster them. Cutting the threads is difficult enough. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  3. Brad Christy

    Delrin question.

    Mike, No pissing match. Just offering up wisdom and options for better results. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  4. Brad Christy

    Delrin question.

    Mike, Keep this in mind: You will NOT satisfy a thread gage form tapping in Delrin or any other plastic. You just have to accept the fact that the threads are going to be tight on the screw, which is, at least in my case, the goal. If you are doing this on a professional level, clear the end result with the customer first. I have brought this to the attention of a couple of my customers', and they have been fine with it, and subsequently very pleased with the results. But they appreciated the head's up to know what to expect. The "Nylock effect" doesn't occur in metals, that I have seen. For the record, I form tap everything I can. Aluminum, Delrin, tool steel, stainless, whatever. It all works... Up to a certain size. I have a 3/8-16 form tap that I use in aluminum, but it's a bruiser on the hands. They are especially nice for blind holes. Start the tap on a machine (if you can), then drive it to the bottom by hand. No tap chips to try and clear out of the way while finishing the thread depth. Truthfully, you get a better result from form taps than cutting taps, as forming the material provides a work hardened surface in the threads, better finish and more consistent pitch sizes. Not to mention the fact that form taps are far less likely to break than cutting taps, due to the lack of clip flutes. Just know that if you DO happen to break one, you're not likely to get it out by whatever means you would normally use to get it out. One material I can tell you that does NOT like to form tap is 440 stainless. I don't know what it is, but it doesn't work. I had to learn this lesson the hard way (thank GOD for thread inserts ) I also have not had the cajones to try form tapping titanium or BeCu. Otherwise, use a good tapping fluid and have at it. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  5. Brad Christy

    Delrin question.

    Samuel, Using a form tap in Delrin naturally produces an "undersized" thread, which is EXACTLY why I use them. The material "rebounds" a bit as the tap is retracted, but leaves a thread that, while it takes a bit of extra torque, the screw can be threaded into. The end result is a very strong thread that grips the screw, similar to a Nylock nut. This is ideal for a motor mount, due to the vibration. I make my motor mounts this way, both the 6-32 holes (tub mounting) and 4-40 holes (motor lugs), as well as my boom collars. Have faith. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  6. Brad Christy

    Delrin question.

    Samuel, I'd strongly suggest investing in the form tap. It'll cost you $20-ish, each, and you'll get a much better result. Form tapping in Delrin produces a nylock effect, and the screws will not vibrate loose. You also don't have to worry about chasing chips to the bottom of the hole, as there are no chips from the tap.You'll wish you'd done it sooner. For example: Fhttps://www.mscdirect.com/product/details/49710593 Tap drill sizes for form tapping: #4-40 - .098-.100" #6-32 - .122" (ideal) but a .125" will work #8-32 - .149" #10-32 - .177" Thanks. Brad. Titan Racing Components Blackack Hydros Model Machine And Precision LLC
  7. Brad Christy

    Oiler reservoir

    Jon, Whatever size drill fits through an 8-32 brass fitting. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  8. Brad Christy

    Oiler reservoir

    Jon, I've been using a length of XL fuel line tubing for awhile now. About 5-6" long, connected to a collar on the shaft tube, via brass fitting. It lays up along side the engine, right side (for mine) over the mount. Just fill before each run and you're good. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  9. Brad Christy

    space button doesn't work

    Mike, I had the same thing going on.. I'm not sure what's causing it, but I found a work-around. Copy-and-paste, from an outside source, any text that contains spaces into the IW reply box. This seems to break the ice, so to speak, and you can then delete what you have and start typing as normal. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  10. Brad Christy

    F/S: .12 Twin Rigger

    Bradley, This boat is essentially a standard BlackJack kit, except the tub is 7/8" wider and the front sponsons are 1/8" wider than normal. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine and Precision LLC
  11. Brad Christy

    Boyz in da shop been busy...

    Terry, Yeeeaaahhhh...... No. If only..... Thanks. Brad, Titan Racing Components BlackJackHydros Model Machine and Precision LLC
  12. Brad Christy

    Boyz in da shop been busy...

    Terry, Yup. I just thought of you when I came across the website. I'm going to be in the area they are located, delivering to a customer, and came across them while scanning the area. I would hate to think what that system costs, though. I doubt it would be worth the investment for even a couple hundred rudder blades, let alone the couple dozen you're making. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  13. Brad Christy

    Boyz in da shop been busy...

    Hey Terry...... http://m4sciences.com Check this out the next time you set to drilling those water holes.... Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  14. Brad Christy

    Best set-up for best cornering speed

    John, That/s not a record trials set-up. That's our heat racing set-up. This thread was started to discuss set-ups for getting around turns the fastest. This is how we are making that happen. Adequately sized turn fin and rudder, width AND depth, and pushing the turn fin forward, with the CG slightly behind the CL of the turn fin. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
  15. Brad Christy

    Best set-up for best cornering speed

    John, With a 1" wide rudder blade, that's over 17 degrees of rudder movement. I'm considerably under 7 and turning on a dime. I'm going to say that, at the rear-most point of the rudder on my Crapshooter45, I've got less than an 1/8" of movement with the transmitter wheel at full right. I actually drill a new hole in the control horn on the servo so I can attach the clevis closer to the servo shaft, which allows for slower articulation of the rudder. I'd bet that if you were to slide your turn fin forward and reduce your rudder throw, you'd get through the turns much faster. The erratic behavior your seeing is due to your exaggerated rudder throw, not the position of your turn fin. Thanks. Brad. Titan Racing Components BlackJack Hydros Model Machine And Precision LLC
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