Navigator weight & size limits

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Joined: Wed Dec 25, 2019 10:13 pm

Navigator weight & size limits

Post by cwnetdev » Wed Feb 05, 2020 5:48 am

Hi. I'm the coach for a new team of middle-school students, and we have a lot of questions...I'll try not to flood the boards... ;)

We could not find a weight limit specified for the Navigator class. Is there one? Or is it just that the ROV must be light enough to be deployed "by hand" (no lifting mechanism)?

We have strived to meet the 60cm size limitation, but the team plans to have an arm/probe attachment mounted to the bow, in order to "reach" inside the bucket to pick up the sediment sample. This attachment will put us outside the size limits.

One of the team had an idea to make it foldable or collapsible, in order to meet the size requirements. There was also talk of a linear actuator mechanism. So basically the arm would be fully attached to the vehicle, but in a folded or recessed position during the measurement process (and for missions it's not needed for). But immediately before the ROV is launched for the sediment sample mission, the arm/probe would need to be manually swung/slid out to its fully extended position.

Is that OK? The rules say all attachments must be connected at time of measurement - but it doesn't specify whether they have to be in their outermost position.

How far inside the bucket is the sediment sample located?

Thank you!

Matthew Gardner
Posts: 1018
Joined: Sat Jan 05, 2013 11:19 pm

Re: Navigator weight & size limits

Post by Matthew Gardner » Tue Feb 11, 2020 2:17 pm


There is no weight limit for NAVIGATOR class vehicles. Weight limitations start with the next class up (RANGER class).

All arms must be attached, but yes, you could fold it in for the size measurement process. For example, if your frame is constructed of PVC pipe, you could rotate a section of PVC so the arm points up instead of forward.

The sample will be just inside the outer edge of the bucket (pretty much as shown in the photos). I did some measurements, the bucket is 36 cm deep. The bricks are 19 cm long (at least the Home Depot bricks shown in the photo). The sediment sample is 15 cm long. So from the math, it should be no more than 1 or 2 cm inside the bucket. The rope may be a few cm further inside since it is attached to the end cap.

Good luck.

Matthew Gardner
MATE ROV Competition

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