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The Elcano Challenge: Ground-Based Circumnavigation (4th)


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  On 5/6/2022 at 1:23 AM, Jack Joseph Kerman said:

Smaller is usually better in this challenge

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What's that so you're saying if I launch a fleet of 250+ ton and 350+ ton ships and supporting patrol craft and reconnaissance planes, I might want to reconsider?

>:(

You can't stop me!

No okay but I really like the idea of doing this with a fleet. I'm assuming I'd be allowed to use AI on the escorts so long as the main one is guided manually? I was thinking of launching a large supply ship with ISRU capabilities, which I would steer myself, and then have maybe two or four other ships running with commands.

I'm eyeballing the green diamond route. It's longer and it looks like there's hills in the way, but I could use the planes to scout around for a flatter route nearby, and the scenery is far more varied than the northern one.

Unfortunately I currently have zero ships that could make this trip; the biggest have around 90k ΔV but I have no idea what sort of range that translates to (I guess I'll find out ha ha). I also don't have seaplanes...(I ain't lugging an aircraft carrier over land, those things would easily break 1000 tons).

Hm....I'll need to draw some doodles...

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Edited by Earthlinger
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So...the mining vehicle is problematic. Initially I was thinking of making reusable rockets that can launch from the supply ship and target nearby areas with high ore concentrations. They could be these cool suicide-burning VTOL things that fill up, take off again and splash down into the sea to get picked up. But the thing is, ore is heavy, and it sinks, and I'm not sure how much it would take to keep a massive, fully-loaded ore vehicle afloat. Because these things would be big. Unless I want to accept a painful amount of back and forth, the vehicle would need to be able to bring in enough ore for some 750 tons of fuel, in two or three trips only, ideally (although I was thinking of having multiple vehicles...).

It would be a big rocket, and bigger with the extra stuff to make it float. The transport ship wouldn't be able to carry it unless I made it massive, and I can't feasibly do that because it would also need to traverse a chunk of land at one point.

I might as well just make the ore things boats.

...

Wait a minute -

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  • 2 weeks later...
  On 5/20/2022 at 7:12 PM, damerell said:

Silly question, but for Kerbin couldn't you just drive it out of the SPH?

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yes, but my goal is
- full stock

- electric propulsion only (wheels and rotor)
- 50m/s minimum in rover configuration (void) and 35m/s minimum on water
- adapted for all planets
- transported from planet to planet with a single vessel (without nuclear or ion) in the whole system (so the challenge would be finished with eve ... cause it seems delicate to come back from there with the rover)

so this way i plan only one launch ;)

im crazy... 1/4 of kerbin done today ^^

 

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Hi,

My main objective is a failure (really?lol) : the rocket doesn't have enough dv to go reffuel, well, yes it has the theoretical dv but I severely underestimated the rover's drag. I'm a bit disappointed as I have a similar craft with the same dv that goes well (with 32 wheels exposed to drag but no rotor or blade). so maybe it's just the drag of those rotors/blades that is problematic.

I would have done better to listen @damerell comment ! xD

Anyway, the secondary objective is still possible! since the rover is waiting near the launchpad after its polar circumnavigation of kerbin (yes my first one!): only 1 rover, only 1 transfer vehicle (2 launches instead of one planned...)

around 5d1h35 IGT for KSC, Npole (exact), Anti-KSC (approx), Spole (exact), KSC. (mostly grounded but crossed the "indian ocean" of kerbin at the end)

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Edited by Pouicpouic
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Step 2 minmus done - polar circumnavigation mostly grounded xD - in approx 2h25 IGT

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Edited by Pouicpouic
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  On 5/24/2022 at 3:46 PM, Pouicpouic said:

I definitely can't drive at night...

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My experience driving at night was that crashes happen more frequently.  I generally try to drive during daylight.  

  On 5/24/2022 at 3:46 PM, Pouicpouic said:

What is your bet for my maximum speed?

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The rover wheels you are using will only go about 58 m/s on flat ground.  I suspect you will be surprised at how fast you can go at Eve using the propellers for propulsion though!  Propellers work extremely well at Eve.

Nice job at Kerbin and Minmus!  I'll add you to the leaderboards.

Please show a few screenshots of your transfer vehicle some time.  (The rocket that takes your vehicle to other moons or planets..)

 

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  On 5/24/2022 at 5:20 PM, 18Watt said:

Nice job at Kerbin and Minmus!  I'll add you to the leaderboards.

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Thanks, I'm having fun so far and I think it will continue until Laythe (I'm getting ready to let KSP run during my nap) --> Thanks to you for reviving this challenge!

  On 5/24/2022 at 5:20 PM, 18Watt said:

 I suspect you will be surprised at how fast you can go at Eve using the propellers for propulsion though

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Tested on eve without worries up to 70m/s but I didn't dare to push further... but I bet on Vall anyway for the absolute record.

  On 5/24/2022 at 5:20 PM, 18Watt said:

Please show a few screenshots of your transfer vehicle some time.  (The rocket that takes your vehicle to other moons or planets..)

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It will be done soon! Well... now in fact, go, go ! xD

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  On 5/24/2022 at 7:19 PM, Pouicpouic said:

the perfect ascent profile with such a drag is quite unusual.

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Yes, but you did a great job!  I also find ascent profiles for such vessels difficult, and I’m usually just happy to make it to orbit in one piece.  Eliminating the floppieness of large rockets is difficult also, it looks like your ship is quite rigid!

  On 5/24/2022 at 7:19 PM, Pouicpouic said:

: I suck at video editing xD

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You are much better at it than I am!

I am looking forward to seeing more of your entries.

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  On 5/24/2022 at 9:31 PM, 18Watt said:

Eliminating the floppieness of large rockets is difficult also, it looks like your ship is quite rigid!

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4 necessary settings to avoid problems :

- all reaction wheels on rover set on "SAS only" (2 medium reactions wheels and the cabin) --> when i driving the rover, i set an action group to change the operating mode of the reaction wheels ("SAS only" at ground, "normal" in case of a jump, "pilot only" never // yes i need both hands to drive this thing^^)

- auto-strut ("advanced settings" enabled in the game options) most of big parts on "grandparent" except robotic, dock, and small non-structural parts --> beware that this can create problems in case of docking with reorganization of root parts : so you really shouldn't activate the auto-strut on all parts without consideration! always leave 2 (or 3) parts "free without auto strut" near a dock or a robotic part if there is a risk

- some struts (only 3 in 4x symmetrical for this vessel)

- turn off SAS or set the vector's gimbal to zero until the launch --> vector's gimbal set at 60% during the first part of the flight and then reduced to 30% or less if the ship makes "waves" near or in the void.

Ah yes and its only a 70parts/430tons vessel, witch is quite low in KSP :) --> I'll share the craft if someone wants to try the whole challenge in 1 launch but it requires a good mastery of ksp imo.

Edited by Pouicpouic
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  On 5/24/2022 at 5:20 PM, 18Watt said:

My experience driving at night was that crashes happen more frequently.  I generally try to drive during daylight. 

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Likewise. The stock headlights are near-useless. However if you are using a life support mod it may not be practical to only drive during the day, especially with Moho's very long solar day.

I found the MTS light from https://spacedock.info/mod/2369/TrackingLights makes a reasonably good "big headlight" (indeed it can be turned up to provide truly absurd amounts of light); I've got two on my Mk VI rover. It's considerably smaller than the Spotlight shown on the mod's spacedock page.

Edited by damerell
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After a month-long hiatus, I'm back to Elcano-ing, and I just completed a Minmus circumnavigation. This one was done in a couple of hours with a new rover that I didn't bother to give a proper name, so we'll just go by its provisional designation of "bug nugget".

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This Elcano was also the first one to feature a reusable launch vehicle, as I felt like the 3.75m core stage gave me a little more delta-V than I actually needed. The booster is powered by four Bobcat engines, with a single Vector in the center to top it off. 

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Launch and Booster Landing:

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Minmus Arrival and Circumnavigation:

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The Trip Home:

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So that's.. let's see here.. Eight Elcano runs completed now. My next one will probably be done on Ike or Dres, which I expect to be not much different from Mun in terms of time/difficulty. After that, I'll probably do one on Laythe, which is basically the Kerbin circumnavigation all over again, then one on Moho, which I am really not looking forward to, as I've heard the terrain there is absolutely ruthless. I'll probably do Eeloo after that, and the final mission will be to do an Elcano of both Eve and Gilly in the same mission, with a return vehicle included.

Edited by Jack Joseph Kerman
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Kind of weird getting that on Minmus - ah, stock wheels. With KF wheels I'd expect them to recognise there's almost no traction, so while the vessel being light would make it easy to nose-up, the wheels just wouldn't be able to apply very much torque.

Alternatively I'd have switched to FWD so that the instant the front wheels left the ground there'd be no more drive torque.

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  On 5/26/2022 at 12:19 PM, damerell said:

Kind of weird getting that on Minmus - ah, stock wheels. With KF wheels I'd expect them to recognise there's almost no traction, so while the vessel being light would make it easy to nose-up, the wheels just wouldn't be able to apply very much torque.

Alternatively I'd have switched to FWD so that the instant the front wheels left the ground there'd be no more drive torque.

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I think the issue was that I had set the drive limiter all the way up, so the wheels just operated as they would on Kerbin- way too strong for Minmus’s gravity. After I removed the middle four wheels, I turned the traction control override back off, and things worked much better.

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Mun circumnavigation done ! really great ! top speed near 72m/s. Was stuck at 59.9m/s for most of the trip, then at 65m/s (less than minmus boooo!) until the last 100km :)

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Edited by Pouicpouic
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Ike circumnavigation complete! This circumnavigation was done using the same rover design as my previous one on Minmus, but this time I decided to make a new mothership for it, the Keimos,  that could take it to multiple planets in a single mission. I.e. after Ike is finished, I plan to take the rover to Dres, then to Moho and Eeloo. I wish I'd thought of this before I did my three-in-one mission to Vall, Bop, and Pol.

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The Keimos:

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Launch/Journey to Ike:

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Circumnavigation:

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Leaving Ike for Dres:

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As always, this run was completely stock with both DLCs.

Edited by Jack Joseph Kerman
hit post by accident before i was done
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Arraki... hmm.. Duna completed in approx 3days IGT ! Mostly accross inner seas and canyons. I'm pretty sure that sandworms can't go faster than 50m/s in the dunes because none of them managed to catch me. ^^

Highest point >6400m ; lowest <240m. Some beautiful landscapes! One wheel repair... Blueberries... ;)

New overall top speed : 76,3m/s. (very quickly dethroned after the transfer to Ike where I've already reached 78,3m/s).

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all screenshots : https://steamcommunity.com/profiles/76561198022663037/screenshots/?appid=sc_578556&sort=newestfirst&browsefilter=myfiles&view=imagewall

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Dres complete. I do not wish to return for a long, long time, maybe ever. Lots of unfortunate events occurred there. The most boring dwarf planet that doesn't exist has enacted retribution against me for making jokes like that. It has inflicted pain and torment against me and my humble rover all the way around its circumference, from the highest mountain to the bottom of the giant canyon. Endless hilly terrain, ground that wheels would randomly clip into, causing SAS to malfunction and making me drive for 200 km without ever leaving the ground, the list goes on. I will one day have my day of reckoning, and I will not be merciful. 

There is only one thing that needs to be said: Dres will be eliminated.

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Anyways, yeah. I completed my Dres circumnavigation, and it was not a pleasant experience. But we'll get to that. Firstly, let's start where I left off at the end of my last post, where I went from Ike to Dres. Once the Keimos was on Dres, the rover was lowered to the ground and a flag planted. This flag would pretty much set the tone for the whole mission. I finally acknowledged Dres's existence, and all it would do is torment me for doing so. I wished to restore cordial relations, but all it did was motivate me to dislike it more.

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The Circumnavigation:

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Canyon:

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Leaving (thank God) for Eeloo:

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Your adventure on Dres reminds me of getting home on Kerbin, where in the very last bit of the journey the steering suddenly and inexplicably got stuck and I had to limp over the line with MechJeb and me fighting the controls. Only, presumably, for rather longer.

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  On 6/1/2022 at 6:46 PM, damerell said:

Your adventure on Dres reminds me of getting home on Kerbin, where in the very last bit of the journey the steering suddenly and inexplicably got stuck and I had to limp over the line with MechJeb and me fighting the controls. Only, presumably, for rather longer.

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It took me almost 3 hours to cover the remaining 200 km after the SAS broke down.

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