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  1. B

    Crashes in the News - Thread

    Here at Meadow Lake in Colorado (KFLY), the runway is altitude 6874. Every year, there is an issue where the pilot comes from a lower-level airport and has trouble with go-arounds. The pilots practice their usual routine, carb heat, full rich, etc. Then when they go to take off they're still...
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    Don't Do Anything Dumb

    It's amazing what people with a lot of confidence do - pretty easy to make mistakes on the ground and get away with it. But up in the air, its a whole different story. "It'll probably be OK" is not good enough when you're messing with gravity....
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    Quiet Flight

    I built a muffler for my 13B, had the exhaust come out of the ports into two circular pipes. One pipe was pointed clockwise, the other pointed CCW, so the exhaust from one port would come round and the sound waves would hit the sound waves from the other port head on. They would theoretically...
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    Electric Remote Fuel Valve

    Tom, I'm using Hydraforce SV10-34-6T-V-12DS for my valve for return flow from the fuel rail, switches to dump fuel back to R or L tank. It has fuel-proof seals and uses -6 fittings, 12V. I got mine from Hydraulic Controls in Denver for $78 a few years ago.
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    Arduino altimeter & airspeed indicator

    The code it was indented for style and readability, but when pasted into this forum, it took out the indents
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    Arduino altimeter & airspeed indicator

    Using the 4kpa sensor where 0 pressure is digital, and the TM1637 display #include <Esplora.h> #include <Wire.h> #include <SPI.h> #include <time.h> #include <stdio.h> #include <TM1637Display.h> int Corr1 = 0; int Sensor1 = 0; int OffsetC1 = 0; float AirSpeed1 = 0.0; int AirSpeed1R = 0; int...
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    Reduction drives

    A direct drive auto conversion always scares me, I keep wondering when the prop gyrations are going to finally break the crank or chew up the thrust bearing. Besides, auto engines are don't make enough power at 2700 RPM. I'd go with a redrive just to keep from breaking the crank. Folks have used...
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    Direct drive SBC

    A direct drive auto conversion always scares me, I keep wondering when the prop gyrations are going to finally break the crank or chew up the thrust bearing. Besides, auto engines are don't make enough power at 2700 RPM. I'd go with a redrive just to keep from breaking the crank. Folks have used...
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    Mazda Rotary Engine

    On aftermarket ECUs for aircraft use, there is a mixture adjustment. On run-up, set the RPM at 4000, hold the brakes and adjust the mixture lean until RPM drops, then richen until it perks up, then a bit more rich. Just like a piston engine. Don't set the mixture to "long flames on takeoff" to...
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    Raptor Composite Aircraft

    I'm concerned that the rear gear has no cushioning capability, and will break upon first landing
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    Not quite so structural foams?

    The local Hobby Lobby sell two kinds of green foam, urethane which is soft, and polystyrene which is a bit tougher. Urethane is very easy to shape, and you can top with poly fiberglass resin and it won't deform. Perfect for making bucks or molds. LongEZ fuselage uses urethane foam, wings are...
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    Arduino altimeter & airspeed indicator

    Originally I used the 3461BS LED chip, since I knew nothing about it. But I got a TM1637 board, which is serial interface and uses the 3462BS LED chip and only 4 wires. Much easier to hook up, and the display commands are just two lines, instead of 167 lines! If anyone is interested I can post...
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    Crashes in the News - Thread

    I agree, looks like he took off on too short a runway with the "50 ft obstacle" at the end. It probably looked like he had plenty of runway based on a tarmac runway, but it may have taken longer (time and distance) than expected due to the water. By the time he was airborne, it was too late to...
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    LS-3 Powered Velocity

    Sounds great! Should move out pretty good! But I believe the LS3 is a 90 degree crank. What's the total weight of the firewall backwards package?
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    Arduino altimeter & airspeed indicator

    I got the MPXV5004DP sensor, soldered it to the extra board I had for the original sensor, and it reads up to 154 kts with no code changes except for raising the max speed for the display. Code worked correctly with the new sensor with no tweaks. Since the low range of the sensor (ambient...
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    Arduino altimeter & airspeed indicator

    I forgot that the pressure/speed formula is non-linear. 4 kpa will only be good for 185 kts or so. So, the 5010 sensor will be needed above that speed. Or two sensors, one for low speed and one for high speed, switchover about 110 kts
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    Arduino altimeter & airspeed indicator

    Thanks Tim Crumley for the suggestion of using the MPXV5010DP sensor. I just used the common MPXV7002DP sensor since that's what others were using, just to get started, but you can only use 0-2 kpa, with 2.5-5.0 v.. The 5010 sensor will sense 0-10kpa (550 kts?) but we may lose some granularity...
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    Arduino altimeter & airspeed indicator

    Here's the Arduino Airspeed Indicator. On the gauge, kts is in the middle scale, mph on outside range.
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    Arduino altimeter & airspeed indicator

    Good write-up by Adam Drees on the 3461BS 4-digit, 7 segment LED chip. I chose that chip because the digits were the right size for my needs: https://www.adamdrees.com/tag/3461bs/ The chip uses 12 pins to light up the LEDs. Here are the chip pins (left column) and the pins I connected them to...
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    Arduino altimeter & airspeed indicator

    I'm using 3461BS LED chip, which comes in different colors, only using the right three digits. The pressure transducer is the common MPXV7002DP . I'm using a small switch to select knots or mph. I prefer knots, but when its set to mph, the decimal points on the chip light up to tell the pilot...
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