Post by sporty on Jan 17, 2008 4:15:14 GMT -6
K,
I have been pondering to ask a few of the pros a few questions. That I feel could help with my sons Soap Box Derby.
But I have to provide some data and info, To find out what you may come up with for a answer/repsonce.
200 pound total weight limit. 10/15 pound max allowed in tail of car. So only 10 to 15 pound weight differance allowed from front to back.
Now, average track is 600 feet long, top speed 32 miles per hour.
They cars leave off a ramp, alot like a pinewood derby car would.
Some races have ramp to flat surface, usually 200 feet long and level. SO everything comes from the ramp and set up.
Typical is ramp to hill/ slope to level at the end of the track.
Most of the time the track is road. Each car uses one lane.
The road is closed so both lanes can be used, (two lane road)
So here I hope this has given you some data to answer my questions.
For all those pro's and phyics people out there.
ramp info-
top 12 1/2%
next 25%
next 33%
bottom 14 1/2% - although sheet metal makes it somewhat of a radius.
I do not have the length of the ramp or the distance from the first slope in the ramp the the next slope in the ramp.
Best guess , length might be around 20 feet (the ramp).
The the distance might be 3 feet to 4 feet to the next angle in the ramp.
What (COM) would you do ?
Balance point ? also keep in mind 200 pound total, only 10 to 15 pound weight difference allowed from front to back.
Does this ramp cancel out any rear tail weight set up ?
Would you run 100 pounds in the front and 100 in the rear ?
What would be the best set up for this ramp ? to gain maxium potential energy from the ramp ?
Most ramps have just a slope, But this ramp is tricky.
I can tell you I ran 101.5 in the rear and we lost on average by .159 of a second.
They do not give track times, only the time differance between the 1st racer to cross the finish line and the 2nd racer.
Sporty
I have been pondering to ask a few of the pros a few questions. That I feel could help with my sons Soap Box Derby.
But I have to provide some data and info, To find out what you may come up with for a answer/repsonce.
200 pound total weight limit. 10/15 pound max allowed in tail of car. So only 10 to 15 pound weight differance allowed from front to back.
Now, average track is 600 feet long, top speed 32 miles per hour.
They cars leave off a ramp, alot like a pinewood derby car would.
Some races have ramp to flat surface, usually 200 feet long and level. SO everything comes from the ramp and set up.
Typical is ramp to hill/ slope to level at the end of the track.
Most of the time the track is road. Each car uses one lane.
The road is closed so both lanes can be used, (two lane road)
So here I hope this has given you some data to answer my questions.
For all those pro's and phyics people out there.
ramp info-
top 12 1/2%
next 25%
next 33%
bottom 14 1/2% - although sheet metal makes it somewhat of a radius.
I do not have the length of the ramp or the distance from the first slope in the ramp the the next slope in the ramp.
Best guess , length might be around 20 feet (the ramp).
The the distance might be 3 feet to 4 feet to the next angle in the ramp.
What (COM) would you do ?
Balance point ? also keep in mind 200 pound total, only 10 to 15 pound weight difference allowed from front to back.
Does this ramp cancel out any rear tail weight set up ?
Would you run 100 pounds in the front and 100 in the rear ?
What would be the best set up for this ramp ? to gain maxium potential energy from the ramp ?
Most ramps have just a slope, But this ramp is tricky.
I can tell you I ran 101.5 in the rear and we lost on average by .159 of a second.
They do not give track times, only the time differance between the 1st racer to cross the finish line and the 2nd racer.
Sporty