Ken Burner
May 22, 2020
4:56 p.m. PDT

Spacecraft (Rover)

What is the anticipated weight of the Rover?
13 Replies

Ken Burner
May 22, 2020
8:35 p.m. PDT
The Small Lunar Payload Users Guide (SLPUG) power/lunar surface 4.b. 8v, 1A MAX, 50 ms MAX.

Please provide the duty cycle for that parameter.

Ken Burner
May 22, 2020
8:48 p.m. PDT
edited
Is the payload allowed to communicate with the Rover on a normal basis through RF in conjunction with or in lieu of the wired P1 UART comm?

Current rules or not, does the Rover have the capability to communicate the same data or additional data vs. the P1 UART, using either or both of the Rover's 900 Mhz & 2.4 Ghz radios?

Does the Rover have IR communications? Does the Rover have a LASER of any frequencies? Is RADAR on board the Rover? If so, is it any other band other than Ka?

Ken Burner
May 22, 2020
8:59 p.m. PDT
@Ken Burner
Is there an equivalent document to the Small Lunar Payload Users Guide (SLPUG) for the Rover?
Tagged: Ken Burner

Ken Burner
May 23, 2020
1:57 p.m. PDT
edited
@Ken Burner
Assume for a moment the Rover's mission life's span is shorter than the payload's. Will a direct link between from Payload to Lander be allowed, or rather encouraged? If so, is the the same RF as Rover?

How long is the Rover 'expected' to provide power and communications to the Payload?
Tagged: Ken Burner

Ken Burner
May 23, 2020
5:33 p.m. PDT
edited
@Ken Burner
Are Spacecraft envelope clearance dimension prints available for the the areas surrounding the top, middle and bottom Payload stations or bays?
Tagged: Ken Burner

Ken Burner
May 23, 2020
6:33 p.m. PDT
@Ken Burner
Revision of my question 'How long is the Rover 'expected' to provide power and communications to the Payload?"

Is there a Rover power and communication hierarchy indicting when the Payloads power and when the Payloads communications are cut off vs. other Rover functions?

It is expected some Payload Challenge submissions will have sustainability (e.g. solar) long after the Rover has depleted its power source. It is desired in some cases to keep a Rover's comm link open as long as possible.
Tagged: Ken Burner

Kyla Jeffrey HeroX team
May 25, 2020
1:36 p.m. PDT
The rover design is not yet finalized, so we cannot provide you with details like the weight of the rover at this time, nor is there a specification document available for the rover.

I will see what responses I can provide to your other questions.
Tagged: Ken Burner

Ken Burner
June 2, 2020
7:15 p.m. PDT
edited
@Ken Burner
Are the Spacecraft (Rover) Payload's Lower (Bottom) interfacing bearing surfaces, assuming equal force applied to the 4 mounting "hard points", able to support the Spacecraft (Rover)'s full mass off of the regolith, e.g. Payload lifts then changes the Rover's azimuth (yaw) in relation to the Payload?

The question assumes bottom Payload bay placement and that the Payload can contact the Lunar surface on it's own and then lift, with a scissors lift table for instance, the Rover for attitude changes. Or the Rover off a rock it's stuck on, etc.
Tagged: Ken Burner

Kyla Jeffrey HeroX team
June 6, 2020
9:45 a.m. PDT
This is an interesting question. You can make the assumption that the payload mounting points will support the weight of the rover in lunar gravity. The payload would have to be located under the rover’s CG so that constrains where it could be located on the bottom of the rover. There may be some mobility advantages of a system that could do this in difficult terrain.

Ken Burner
June 7, 2020
5:44 p.m. PDT
edited
@Ken Burner
Probably be best if Rover designers made at least the bottom, and probably the top Payload bay, having their Payload hard point centers at the Rover CG. Never know if one (a Rover) might need future "crane" lifting to a new location. Nicer if it was 'balanced' on top too.
Tagged: Ken Burner

Ken Burner
June 7, 2020
5:54 p.m. PDT
edited
@Kyla Jeffrey
I appreciate the answers. We're not thinking about lifting a 15Kg Rover, but the smaller ones....

The 15Kg monsters, well just drag them free with Nano-Tractor Payloads of course. Wireless recharge the big guy and send him on their way. Maybe a lens and sensor blow off first.
Tagged: Kyla Jeffrey

Ken Burner
June 24, 2020
5:10 p.m. PDT
edited
@Ken Burner
If the current limit duty cycle on the 6-8 VDC buss is 50%, then the charging times for Payload batteries can be reduced by 25%, e.g. from 4 Earth hrs. to 3 hrs.
Tagged: Ken Burner

Ken Burner
June 24, 2020
6:55 p.m. PDT
@Ken Burner
If the Spacecraft (Rover) RF comm link with the Lander fails on the Rover side, then would the Payloads then be allowed to communicate with the Lander directly, if they had that capability?

Also, would a failed Rover/Payload comm link or a failed Rover to Lander link then allow for intra-Payload communications to take place, e.g. to assist in relaying another's Payload's data to Earth?
Tagged: Ken Burner
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