Hi yes sorry bout that. My name is Martin and back in high school they use to call me Martin Maniac cause it was crazy how many 3's I would make in a row in basketball. Addtionally steve yes we have taken into account the center of gravity. I actually have done some calculations on it, only to find that the air force had published an article on the same topic for people ranging from 150-225 lbs. But yes our device will allow the user to tilt themselves to a point where when they get to the stairs, they will still be seated in a normal position.
Neil the trolley 120 degree wheels design was one of the options my group came up with during brainstorming. However, after doing the pugh chart for each idea we decided that type of wheel base wasn't ideal. We do not have the luxury of changing the wheels since we had already turned in a design report. On Wednesday, April 23, 2014 7:11:30 AM UTC-7, TyngTech wrote: > > Sounds like your describing an integrated manually powered version of the > Roby Stair Climber. You'll need to integrate a tilting feature on the > tracks to keep the center of gravity above the track system (like shown in > the Roby brochure). > > > http://www.savaria.com/_files/file.php?fileid=filefRyJyeSyuO&filename=file_Savaria_Roby_system.pdf > > Steve Tyng > > > > On Tuesday, April 22, 2014 10:48:14 PM UTC-4, Maniac08 wrote: >> >> Actually Neil it will be a type of medical device to help a wheel chaired >> person go down the stairs in an emergency situation. We are using a track >> system to enable the user to do so. We are not actually building an RC >> tank. I am sorry if this forum is only for rc tanks, but I did legitimately >> have questions on how you guys go about choosing your type of track system. >> >> Here is the low down on our project. We are building an attachment to a >> wheelchair to help the wheelchair population travel down stairs during >> emergency situations by themselves. All products today require the >> assistance of others during emergencies and we wanted to make wheelchair >> users more independent. So the track system will be engaged with the large >> wheels of wheelchair by way for chain and sprocket. So as the user drives >> with the big wheels the tank tracks should move with them also. We are >> including a sort of bike gear system to chain and sprocket so the wheels >> can be easier to turn or harder to turn depending on the speed the user >> wants to go. But we had limited the max speed to 5mph for safety reasons. >> Our wheelchair does not need to go up the stairs yet, we want to deal with >> going down first. Maybe after securing that function we can incorporate a >> motor to help user go up also. A normal wheelchair has max weight of 250lbs >> and wheelchair has a weight of approximately 50lbs with the footrests. So >> in turn the tracks will need to hold about 300lbs. If we are able to build >> a working project. I would gladly share the images and designs with you. In >> addition also mention you as an advisor in our presentation. >> >> The reason we wanted tracks is because we desired as much possible >> surface area with the ground as possible during descent in order to stop >> slipping or tipping over of user. The best way my group believed for this >> to happen was a track system. I am in charge of finding a suitable track >> system for our project. I came across your website and was hoping to get >> some tips and opinions on the type of track we should use. We planned on >> using the ones made by the rc robot war websites, but found out they were >> too expensive and pushed us to find a more cost-effective solution. >> >> The tracks will be inside the wheelchair frame. Which is roughly 23 >> inches from the back of the wheelchair to the front. Then 17 inches from >> large wheel to large wheel. We were hoping to use sprockets of 2-3 inch >> diameter as we have only 18 inches from bottom of seat to floor with a >> crossbar being in the middle. >> >> >> On Sunday, April 20, 2014 10:41:23 PM UTC-7, Maniac08 wrote: >>> >>> Hello All, >>> >>> I would like to ask some of you experienced rc tank builders for advise >>> in a project where I will be using a tank track system. I'd just like to >>> procure some research before choosing which type of track system to employ. >>> I found your group through this page: >>> http://www.rctankcombat.com/articles/track-systems/ . I am given a >>> budget of only $400 and buying a customized track tread from the rc robot >>> companies is just way out budget. I would like to use one of the systems >>> found in page mentioned before. My device will need to be able to handle a >>> load of 300lbs and travel down any type of staircase: cement, wooden, tile. >>> It needs to be able have enough friction so that the speed of device will >>> only reach 5mph and be able to stop while angled on the stairs. I'd like to >>> ask you wise gentleman your opinion on which track system I should use and >>> why. >>> >>> Appreciate all your input and expertise, >>> Maniac08 >>> >> -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
