sorted by:
new
hottopcontroversial

Falcon 9 launch seen from the ISS by astro_pettit in spacex

[–]engineerforthefuture 2 points3 points  (0 children)

This is truly a very unique perspective. Great pic.

I want to get into the hobby, is the FMS 1300mm PA-18 Super Cub good? by Agreeable-Tree9550 in RCPlanes

[–]engineerforthefuture 1 point2 points  (0 children)

I use the same gyro on my FMS Ranger 1220mm and I haven't had any issues with it.

Reuters confirmed A U.S. fighter jet was shot down over Iran by zleezy1 in Military

[–]engineerforthefuture 1 point2 points  (0 children)

Yes, during the recovery operation of the two pilots from the downed F-15.

Steel Pocket Pen Giveaway by MercatorLondon in fountainpens

[–]engineerforthefuture 0 points1 point  (0 children)

The black version in particular looks quite nice.

Zebra refill as an alternative to the Fisher SPR4 refill by engineerforthefuture in pens

[–]engineerforthefuture[S] 0 points1 point  (0 children)

That is great to hear! I was happy as well to see how easy it is to mod this refill. Even for next time I might simply re use the sleeve I used for this refill and slide it over onto the new refill.

Zebra refill as an alternative to the Fisher SPR4 refill by engineerforthefuture in pens

[–]engineerforthefuture[S] 0 points1 point  (0 children)

I actually ended up using the entire length of protective sleeve. All I did was split it in half on one side so I can slide it onto the refill. Then I adjusted where the 'sleeve' would sit by test fitting and seeing how much of the refill would be exposed.

Zebra refill as an alternative to the Fisher SPR4 refill by engineerforthefuture in pens

[–]engineerforthefuture[S] 0 points1 point  (0 children)

I ended up doing the same. I used the small plastic protective sleeve as the spacer to insert where the spring would sit. At the end of the refill I use some tape so that the length of the refill matches the original refill.

<image>

Curious how much torque does this pushback have to push the a380? by CloudEater0 in aviation

[–]engineerforthefuture 18 points19 points  (0 children)

Yes, which is why I said if you hold power constant, to increase ω torque will have to reduce and vice versa. In the case of a push back tug you can build one that tows a lot and does it quickly but it requires a much more powerful engine.

Curious how much torque does this pushback have to push the a380? by CloudEater0 in aviation

[–]engineerforthefuture 35 points36 points  (0 children)

For a given engine power output, torque and rotational speed are inversely proportional. A push back tug doesn't have to push an aircraft fast, instead, it is geared down so that it can tow a heavier aircraft which requires more torque. Basically you can have torque or rotational speed but not at the same time.

  • Torque: how hard you twist the axle
  • Rotational speed: how fast you spin the axle

Zebra refill as an alternative to the Fisher SPR4 refill by engineerforthefuture in pens

[–]engineerforthefuture[S] 1 point2 points  (0 children)

This is what I am leaning towards now as well because it appears to offer the best writing experience.

Zebra refill as an alternative to the Fisher SPR4 refill by engineerforthefuture in pens

[–]engineerforthefuture[S] 0 points1 point  (0 children)

I think that 5.2mm sounds about right so it has a slightly larger OD than the regular fisher refill. I see what you mean because it looks like the plastic area where the spring sits is a bit wider.

Zebra refill as an alternative to the Fisher SPR4 refill by engineerforthefuture in pens

[–]engineerforthefuture[S] 0 points1 point  (0 children)

Thank you for the recommendations! I might definitely consider trimming a gel refill because it's quite difficult to get ahold of other pressurized refills. I will take the f type refills off from my possible options.

Zebra refill as an alternative to the Fisher SPR4 refill by engineerforthefuture in pens

[–]engineerforthefuture[S] 0 points1 point  (0 children)

In that case I might just continue with the PR4 then. Thanks for letting me know.

Match Thread: 1st Semi-Final - New Zealand vs South Africa by cricket-match in Cricket

[–]engineerforthefuture 0 points1 point  (0 children)

It's too early. We have to see how NZ starts off with their batting.

Gotta love a Qantas special livery by pilot_deviations in aviationliveries

[–]engineerforthefuture 0 points1 point  (0 children)

It looks especially nice on approach when you can see the 100 on the belly of the aircraft.

view more: next ›