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  • Users: RoarkS
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  1. 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...
  2. RoarkS

    Mech guy needs help...

    Hey so I'm building a generator system with an existing 300 amp 28v DC starter generator. For most of it's use it's going to be driven by gas engine to make about 200 amps. But I need it for starting a large engine, that pulls north of 500 amps spike on inrush. The system currently uses a large...
  3. RoarkS

    Poking holes 2

    So round two... I'm clear of the first group, getting ready to hire another set of DER's but want to guide where this is going. part 23 turboprop. aft of pressure bulkhead. I have the OEM FEA analysis results for the area. -previously mentioned there is an existing hole done by the OEM near...
  4. RoarkS

    Poking holes

    So I've gotten pretty good at poking holes in planes. I have a few boilerplate reports I've gotten approved over the years and they are good to go. So I got a call today and I have to poke a hole next to another hole. I looked at the existing hole, counted rivets, measured pitch... so on...
  5. RoarkS

    Dynafocal

    Who knows what the geometry definition of a Dynafocal I engine mount is?
  6. RoarkS

    4 bar linkage problem.

    Youtube video So I'm working on a 4 bar linkage for a fella. The video is rev b. You can see he is applying force to the input driver link. On the way down the coupler link goes down like its supposed to. But on the way back up, you can see it hits a dead spot and the mechanism doesn't...
  7. RoarkS

    AC43.13-1B Figure 10-17

    AC43.13-1B Figure 10-17. Why. It's worded horribly. What's the utility of momentarily shifting the datum to the mains? Just had a student use this for a C172N (nose dragger). Train wreck. /Annoyed
  8. RoarkS

    Wing loading.

    As much as I thought I wouldn't have an aerospace engineering job anytime soon I certainly had an interview this past week. Guess I'll be back at it. In the mean time... amateur hour to keep me entertained: So going about my day and I have a pilot/aircraft owner start telling me about his...
  9. RoarkS

    Pencils.

    Writing on Aluminum. So for my short time in this world I've been told the gold standard is the blue fine tip Sharpe for doing layout work, because normal pencils and aluminum are not friends (Galvanic with graphite and scratches). 2 questions: A: what do you all use? B: This was spurred by a...
  10. RoarkS

    FAA Mechanic book is sloppy...

    Folks, I usually live over in Aerospace, but I figured I should post this over here. I'm trying to teach mechanics with this hot garbage. They just changed the regulations forcing us to teach with this...
  11. RoarkS

    Hot dimple machine.

    (See attached images) So I saved this thing from the scrap yard last week. Still trying to figure out what I'm going to do with it. -Does anyone have a manual for the various dimple tooling bits? I'm only used to CP214 3/16" shank dimple and squeezer sets. I'm not familiar with what's...
  12. RoarkS

    Worthless question of the day... annular burners.

    Okay... I'm thinking PT6 here. Actual flame in the burner Is it a rotating toroid of flame being held at a particular station number... or are the fuel nozzles creating discrete "streaks" of fire behind them?
  13. RoarkS

    Test cell club propeller.

    So I've got a fun little side project. I'm building up a test stand for the local A&P school with a rebuilt O-320-E2D. I **Think** I have a propeller that I can slap on it just for the sake of running an engine but what's the fun in that? Lycoming manual says to use a test cell club prop...
  14. RoarkS

    Flutter testing

    https://www.youtube.com/watch?v=ZymXOrPL1CQ I've spent a fair amount of time shaking stuff for shock and vibe testing... But it's usually just a fail check running an ATP on the hardware after testing. How does this work for flutter? So he's got a stinger exciting the wing tip (I'm guessing...
  15. RoarkS

    Magnetos

    Hey my typical Aerospace forum must be too advanced to talk about magnetos. Anyone in here have some references for electro-mechanical design of magnetos for engine ignition? I need to make a 5 cylinder one. I could cannibalize the typical 4 and 6 cylinder ones, but I want to make sure I'm doing...
  16. RoarkS

    Magneto design.

    Who's got the drop on magneto design info. After watching Elliot Seguin's trials with the down lock failure causing his hydraulic pump cycle against a wall taking out his main bus, dropping the ECU and Fuel pumps... I feel a renewed desire to figure out a 5 cylinder magneto design. Something I...
  17. RoarkS

    instrument holes.

    Okay my fun moonlighting for the evening... reverse engineering an instrument panel. These have to be standard holes... I guess I was expecting numbers a little more nominal than what I've got. Example: Ø3.150" with Ø.150 mounting holes on 2.480 square. I'm sure there's a mil spec...
  18. RoarkS

    6061-T6

    Okay I got blindsided a bit today. DER said that 6061-T6 isn't industry standard and everyone wants to get away from it because of fatigue issues. I tilted my head and said huh? Thoughts?
  19. RoarkS

    Electrical enclosure bonding.

    So... I'm working on a box that encloses a DC to AC 3 phase motor controller. The controller card itself is mounted to an aluminum finned heat sink. I'm not 100% if the stainless mounting screws make the heat sink "electrically bonded" to the card... I'm guessing not as they are stainless and I...
  20. RoarkS

    Firewall forward fire protection.

    Actually posting a dayjob question for once! G.A. Cabin air control valve. There is a cable operated stainless steel shut off valve at the firewall. However there is also a proportioning valve that's driven by a COTS electric actuator. We have certified the actuator to Part25 Appendix F (b)(4)...

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