Propellers are backwards???

beigealert
Peasant

Posts: 3

Propellers are backwards??? Feb 14, 2015 8:10:48 GMT

Post by beigealert on Feb 14, 2015 8:10:48 GMT

Okay maybe I'm just going crazy but...

Start a new machine...
Put two spinning blocks on top of the first block, and set their rotation speed each to 2.00 (giving you a total spin speed at the top of 4.00).

Attach propellers to each side of the top spinner, and adjust the spin of the spinners, or the flip of the propellers such that it LOOKS like it should fly.
Play it... and... it doesn't fly, it sits on the ground twitching.

Now, either flip all the propellers around, or flip the spinners around, thus making it the OPPOSITE of what it should look like. Play, and voila! It somehow flies!

This was very frustrating as I spent a good amount of time trying to add more and more propellers to a contraption, scratching my head as to why, and always coming to the conclusion that it must still be too heavy. Eventually I gave up and scrapped the whole thing... but now realize everything was blowing the wrong direction because the art is backwards from what it should be!

Very frustrating, but I'm sure you guys will fix this.

SuburbanSB Moderator Tinkering with bugs Posts: 431	Propellers are backwards??? Feb 14, 2015 8:35:44 GMT Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by SuburbanSB on Feb 14, 2015 8:35:44 GMT Huh interesting, I'm going to have to test this out... so I'll be back in a short while

SuburbanSB
Moderator

Tinkering with bugs

Posts: 431

Propellers are backwards??? Feb 14, 2015 9:13:39 GMT

Post by SuburbanSB on Feb 14, 2015 9:13:39 GMT

Alright, so I came a with a pretty basic design structure... (had issues with the spinning blocks xD they caused so much force it was flipping my machine!)

Okay, so the first image, is where nothing is changed, and the blocks have just been placed as per usual. This is the improper placement for the propeller, this results in the machine 'twitching' and spinning out.

SPOILER: Click to show

The second image is where the propellers have been rotated. This is the proper placement for movement back and forth.

This issue here however, is the blades are moving in a clockwise direction, which appears that the machine should go backwards, however it in fact goes FORWARD?!

SPOILER: Click to show

This third photo shows the spinning blocks having been flipped. It looks as if the machine will be going forward now as the blades are going anti-clockwise, thus 'pushing' air out the back, and creating thrust. This however is not the case.

SPOILER: Click to show

This does appear to be an issue, and a bug, and thus should be moved to the bug section!

I'll just copy it over there for documentation reasons.

A bug thread with this issue has been posted here: besiege.freeforums.net/thread/924/aerodynamic-propeller-thrust-incorrect

Please refer to that thread with any further details!

Last Edit: Feb 16, 2015 11:08:06 GMT by SuburbanSB

beigealert
Peasant

Posts: 3

Propellers are backwards??? Feb 14, 2015 9:23:25 GMT

Post by beigealert on Feb 14, 2015 9:23:25 GMT

Yup, definitely backwards.

It's also frustrating how much mass the spinning blocks have. I tried making a helicopter -- two rotors: one on the top, and one in the back facing sideways to counteract the rotation of the main lift rotor. However, the rear stabilizing propeller's spin causes the whole contraption to flip end over end simply because it's spinning. I know because I first stabilized my entire helicopter vehicle without the rear rotor spinning -- that is I tried to get it to where it would sit and spin in a gentle hover. Then, I started to tweak the rotation values of the rear rotor to cancel out the main rotors spin side-effect, but surprisingly found that the entire helicopter will do a faceplant or a backflip now, even with fairly slow rotation values on the rear.

SuburbanSB
Moderator

Tinkering with bugs

Posts: 431

Propellers are backwards??? Feb 14, 2015 9:33:34 GMT

Post by SuburbanSB on Feb 14, 2015 9:33:34 GMT

Yeah, I can see what you mean... If you check this thread, you will notice that spinning blocks have a weight of 1.0 Now with two of those, spinning at a total of 4.0 Thats a total weight of 2.0 (4 x the double wood blocks) spinning crazily fast! If the rotation speed it brought down, it will solve some issues with stabilisation.

Of you could actually use the steering block, which allow for a controlled spin, however it is slower.

Last Edit: Feb 14, 2015 9:33:44 GMT by SuburbanSB

Post by beigealert on Feb 14, 2015 8:10:48 GMT

Post by SuburbanSB on Feb 14, 2015 8:35:44 GMT

Post by SuburbanSB on Feb 14, 2015 9:13:39 GMT

Post by beigealert on Feb 14, 2015 9:23:25 GMT

Post by SuburbanSB on Feb 14, 2015 9:33:34 GMT

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