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Type: Posts; User: apalrd

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    Some notes on emissions: Hydrocarbons are...

    Some notes on emissions:

    Hydrocarbons are formed due to rich clouds (or homogenous rich mixture), which are usually formed in 2 and 4 stroke engines by running fuel rich. They can also come from...
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    They mentioned that the mouse sensor has a +-5deg...

    They mentioned that the mouse sensor has a +-5deg deadband when the motion is aligned to an axis (X or Y), so they rotated the sensor by 45deg relative to the car (so the sensor sees 45deg at 0 slip...
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    Why don't we release all of the design reports?...

    Why don't we release all of the design reports? The SAE Clean Snowmobile Challenge releases all of the team's design reports and PDFs of their powerpoint 'design' presentation online after the...
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    A normal radiator cap will release at ~1 bar. So,...

    A normal radiator cap will release at ~1 bar. So, the cooling system pressure will be regulated to ~1 bar gauge, as the water is heated and expands the pressure will rise and the cap will release the...
  5. Thread: 95-octane

    by apalrd
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    1,571

    http://bfy.tw/4zoW On any forum, it's...

    http://bfy.tw/4zoW

    On any forum, it's generally appreciated if you search first.
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    Did you analyze the rest of the manifold first? ...

    Did you analyze the rest of the manifold first?

    I can think of a few better uses for simulation time/effort than looking at transient flows in a manifold.

    A transient flows simulation is 3-d....
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    Why not electric power steering? There are a...

    Why not electric power steering?

    There are a number of quads and snowmobiles and such that use electric power steering, as well as a large number of production road cars. Less parts, less weight,...
  8. Thread: UTAS build 2015

    by apalrd
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    31,775

    If you look at students.sae.org for results...

    If you look at students.sae.org for results (http://students.sae.org/cds/formulaseries/results/) and download the file, the last tab has 'info' which includes team country, engine cylinders,...
  9. Thread: Shifting lever

    by apalrd
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    2,118

    It's probably a good idea to put it within easy...

    It's probably a good idea to put it within easy reach of the driver. It would probably make sense if you put it on the same side of the car as the shift lever on the transmission, to reduce the...
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    Why does it matter if it's a go-kart or kids car?...

    Why does it matter if it's a go-kart or kids car?

    Both are roughly the same size and an electric kids car is a lot cheaper. For safety reasons these vehicles should not be moving very fast anyway,...
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    We have designed around 2 gears in an autox. So,...

    We have designed around 2 gears in an autox. So, 'low end' to us is torque from 7k to 9k or so (redline is 11k). With NA we could have a torque peak at 10k (high power number) or a flat curve from...
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    Properly sizing the turbo is quite hard for tiny...

    Properly sizing the turbo is quite hard for tiny engines. For an I3 and up with a single turbo (or V6/I6 and up with two), and equal length exhaust runners, the pulses all come to the turbine...
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    Okay some information on turbo FSAE cars: ...

    Okay some information on turbo FSAE cars:

    Rules:
    -You can have a pipe between the compressor and the throttle (it wouldn't be practical to connect them directly). You cannot have a pipe >60mm...
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    In general, some sort of sidepod is used for side...

    In general, some sort of sidepod is used for side mounted mufflers. This is to prevent burns to the driver when entering/exiting. Ceramic coating wouldn't be enough, since the pipe is still quite...
  15. Thread: RCV Hubs

    by apalrd
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    I'm not heavily involved in the outboard design,...

    I'm not heavily involved in the outboard design, I specialize in the powertrain control models. mcoach would have all of those numbers, probably from memory, hopefully he jumps in here. This is a...
  16. Thread: RCV Hubs

    by apalrd
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    For the last two years we have used all aluminum...

    For the last two years we have used all aluminum tripod housings integrated into the hubs, no inserts at all. You can see them here -...
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    We use a short coiled cable with a Deutsch...

    We use a short coiled cable with a Deutsch connector (DTM 4pin I think) at the end. This has not caused any problems. Since there is someone to 'catch' the steering wheel during egress, the driver...
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    http://bfy.tw/iyU should help you a lot.

    http://bfy.tw/iyU should help you a lot.
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    That's a fairly simple harness, good job. A...

    That's a fairly simple harness, good job.

    A few comments:
    -While not required by rules, it's good practice to high-side drive the kill switch circuit, since it's fairly safety critical. That way,...
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    I'm quoting this so you'll look at this picture...

    I'm quoting this so you'll look at this picture again. It shows a very very simple pedal box. The brake pedal is made of what appears to be a 1x1 steel box tubing section (very cheap, easy to get,...
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    This is partially true. A team with a larger...

    This is partially true.

    A team with a larger budget can afford things that a team with less budget cannot. This, however, can be justified in design.

    From the 2015 rules:

    The bolded sections...
  22. Yes, I'll go with what Birt said about plenum...

    Yes, I'll go with what Birt said about plenum size. It's way more important to analyze the size of the plenum and runner geometry (length/diameter) than the shape, as long as you aren't too terrible...
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    If you are not constrained by the restrictions of...

    If you are not constrained by the restrictions of an IC engine (which generally has a sprocket rather than an integrated differential/final drive), is a chain necessary? Would a gear be suitable? or...
  24. Thread: Motec PDM

    by apalrd
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    Again, it bugs me that the FSAE/FS competitions...

    Again, it bugs me that the FSAE/FS competitions are so far apart on some rules. FSAE US Rules Committee had this to say about solid-state relays



    As for fuses and relays, I don't think any...
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    Prior to this year, registration for Lincoln as a...

    Prior to this year, registration for Lincoln as a second event wasn't difficult, there was ample time to click the button. Lincoln is becoming more popular, and there are fewer spots left for the...
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