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  1. RoarkS

    Designing a cam

    @CWB1 New engine. New cam. New everything. If you're willing to dive in and help... I'll tell ya anything I know.
  2. RoarkS

    Designing a cam

    guess I'll give it a try.
  3. RoarkS

    Designing a cam

    Gruntguru... I hear ya... you're preaching to the choir sir. I reached out to few places... haven't heard back from anyone. soon as I say aircraft and FAA they can't hang up fast enough.... but hey... math is math.... looks right. I've got about a month left before design freeze and we start...
  4. RoarkS

    Designing a cam

    Well... that's the beauty of it. I'm making it up as I go! lol. Big company, small department, very lean on resources. Have to do our best to get the prototype to give us good data/hopefully be good enough. Have a look... tear it apart. EDIT: I guess I should explain it... Top left is my...
  5. RoarkS

    Designing a cam

    @BrianPetersen- Yeah that's what I've been saying in the back of my head... I know what sport bikes run up to. I'm running pushrods, so I ratioed my arm to get the load on the rod down. I just feel like I'm a little chicken and the egg situation... as I'm trying to size the springs, which then...
  6. RoarkS

    Designing a cam

    That's what I figured... I started with a 140 deg cam, 280 deg crank.... cam, but was getting upwards of 250g... felt like that was too much so I started increasing the ramp till I got up to 400deg crank... and yeah that doesn't work. lol. Person I was talking to was definitely talking in crank...
  7. RoarkS

    Designing a cam

    Okay. I'm freaking out a little here... cam lift is 100 degrees on the cam. that means 200 degrees lift to lift on the cam. that's 400 degrees on crank. I'm mapping it out and that seems impossible. What's considered an acceptable G load?
  8. RoarkS

    Designing a cam

    LouScannon: I'm doing a lot of ASSuming. lol... but I'm trying to be very conservative on the assumptions. I'm shooting for 22hp ISA sea level. Done a lot of comparative stuff. I don't have any good fluid dynamics but I'm essentially copying a well known design for head and port geometry. I...
  9. RoarkS

    Designing a cam

    Hey folks, Would like an idiot check. I'm working on designing the camshaft for a small 4 stroke generator engine that will run at 5000 rpm. I've spent about 3 weeks total on cam design thus far and am having an absolute panic attack. lol the cam has a base circle of Ø1.125 and a roller...
  10. RoarkS

    Aerospace Engineering Experience

    I hyper focused on 3D cad in school. I know details on how to manufacture stuff. My contacts list in my phone could probably get any part a human could possible design in the right place to get made...especially gun parts. I really like sheetmetal parts. I really like riveting. I spent 20...
  11. RoarkS

    A little sanity ...

    Hey! Cessna 340 tanks!
  12. RoarkS

    SpaceX Starship missions

    Blue Origin New Glenn. Talk to the dinosaurs re: Chicxulub
  13. RoarkS

    High-Temp Electromechanical Solenoid

    building on previous: If going remote with a rod isn't available Curie temp magnets in the 900c range do exist like Hiperco 50 $$$ Coppers conductors resistance at that temp is going to be up there. no insulators other than ceramic that are going to handle it. Thermal expansion will be...
  14. RoarkS

    SpaceX Starship missions

    Anyone here from SpaceX... They are doing something absolutely wild no one has had the balls to try. They are strapping rockets to industrial fluid tanks and trying to put them in orbit... Adjusted for inflation: 1:US nuclear Arsenal 10 Trillion 2:WWII 5 trillion. 3: Iraq Afghanistan 5...
  15. RoarkS

    DO-160G Vibration Test for Electric Drives and Gearboxes

    None of the profiles in DO-160 are going to be applicable to eVTOL environments. It's neat when you're in the lab the Turboprop profiles sound like you're in a turboprop. Helicopter profiles sound like helicopters. eVTOL profiles sound like... they don't exist yet. You could do the random...
  16. RoarkS

    Help Identifying Callouts in an Old Drawing

    1st off, not like anything I've seen/I don't recognize the formatting. BUT It sure feels familiar. Looking at -A- I'm guessing a Datum simulator/gage tooling, is installed into the associated bolt circle to establish a central axis from which A1 dimensions are pulled. Basically saying hey this...
  17. RoarkS

    Mech guy needs help...

    300 amp 28v DC starter generator. Last I checked that's 8.4kw... DC. Off grid as it gets. -------------------- I'm fairly impressed too. There are sensors in the battery to help monitor if they do decide to catch on fire. But I promise I watched it hit 15.2 volts at the peak inrush... then...
  18. RoarkS

    Mech guy needs help...

    I promise we started with basic physics and worked up. Gas driven generator is the only way. A turbine would be arguably better, but development costs are way too high.
  19. RoarkS

    Tolerance of Upset Rivet Head

    I'll second MIL-R-47196A. They have a fantastic table for tolerance that requires a minimum diameter, then a fairly strict height tolerance (about .010 tighter than where that table OP posted came from). Very easy to inspect and flow down to manufacturing without requiring anyone to realize D is...
  20. RoarkS

    Mech guy needs help...

    Okay I wrote this as a forum post, but ignore that. Lets sus out the main question at the end. "Sorry to leave you hanging... took a minute to come back to this project. So I just looked... the batteries are closer to $10k. But like I said We’re making an engine driven generator. I was joking...

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