PWScottIV

Over 100 people have Viewed this so far and there's only 6 Votes... Hmmm So, I guess that means 98 votes for "No"!? Gravity Waits for No One.

Just wondering how many skydivers out there have done a Night Helicopter Jump... Please Vote! From skydivers I've spoken to, it seems like it's a pretty rare event. If you'd like to do one, Skydive Paso Robles is having a grand opening event: Night Helicopter Jumps - Saturday July 30th 2011 Gravity Waits for No One.

Skydive Paso Robles Grand Opening Event- Saturday July 30th Visit our Facebook Event Page The Skydive Paso Robles Grand Opening Event will definitely be a weekend you won't forget. During the day we'll be jumping a Bell Jet Ranger Helicopter and the World's First N8779T Skydiving Jump Aircraft! In the evening we'll be having a barbecue with burgers, hotdogs, sausage, steak, and corn. After dark we'll be making NIGHT HELICOPTER JUMPS! If you've never done one, it's because most jumpers haven't. Our facilities include a covered packing area, restrooms, two large coolers to keep your drinks cold, free showers, and a free camping area. HIGHLIGHTS: Day and NIGHT HELICOPTER Jumps from Bell Jet Ranger Ultra-Low Ticket Prices World's First N8779T Skydiving Jump Aircraft Barbecue (Burgers, Hotdogs, Sausage, Steak, and Corn) PRICES (This Weekend ONLY, we are selling Jump Tickets AT COST): N8779T Skydiving Jump Aircraft (11,000ft): $14 Bell Jet Ranger Helicopter: One Ticket Prepaid via PayPal: $65 each Two or more Tickets Prepaid via PayPal: $60 each (We're paying the pilot $60/jumper) One Ticket Purchased at DZ on the 30th: $70 each Two or more Tickets Purchased at DZ on the 30th: $65 each Prepaid tickets MUST be purchased At LEAST 1-week in advance. Send us a Message if you want to purchase Prepaid Tickets. Tickets are not transferable to another jumper. ITINERARY - Saturday July 30th: 9am: Jump operations begin 11:00am: Bell Jet Ranger Helicopter Jumps Begin (We'll run for as long as we have loads to go up, but probably only for an hour during the day) 7:00pm: Barbecue Starts 8:21pm: Sunset 8:30pm: Helicopter Night Jump Briefing 9:00pm: Night Jumping Begins DAYLIGHT BELL JET RANGER HLICOPTER JUMPING DETAILS - Exit Altitude will be 5000’+ AGL Between 11:00-11:59am (Or longer if we have enough jumpers) Jumpers Must be “B” License Qualified Get to the Dropzone EARLY for Paperwork, Logbook, and Gear Checks Do NOT sign-up if you Do Not Plan to Attend - We WILL hunt you down like a dog. NIGHT-JUMP BELL JET RANGER JUMPING DETAILS – Exit Altitude will be 5000’+ AGL Briefing for Night Jumping is at 8:30-9:00pm Jumping Hours are 9:00-9:59pm (Or longer if we have enough jumpers) Jumpers Must be “B” License Qualified Jumpers Must have made At Least 1-Jump at Skydive Paso DZ during Daylight Hours Jumpers Must have At Least 1-no/low-airspeed Daylight Jump Prior to a Night No/Low Airspeed Jump Jumpers Must Attend the Night-Jump Briefing Mandatory Equipment for Night-jumpers: Strobe - (3-mile visibility) 2 Chemical Light Sticks - (3 is better) Flashlight - (To check open canopy) Cell Phone - (So you can call us… or we can call you if off-field landing) Whistle - (While descending under canopy and to help find you if off-field) Goggles with CLEAR lenses Lighted Altimeter - (Or ability to attach a chem-stick to the altimeter) One Daylight Helicopter Jump (11:00-11:59am on the 30th) Qualifies Jumper to Meet the Requirements of #5 and #6 above. Gravity Waits for No One.

lol, true. Obviously, no amount of studying could replace what one learns from experience. Gravity Waits for No One.

Probably... However, even before my first jump, which was AFF1, I had studied to a pretty extreme degree to develop a better idea of what to expect... I had read about every fatality, nearly finished reading the SIM, and had watched probably every AFF video online at the time. A bit extreme by most people's standards, but in my opinion, knowledge is power. With extreme sports, it could be the power to make the right decision that saves your life. Gravity Waits for No One.

Yeah, I concluded my first post with that estimate... I didn't know how thorough of an answer he needed. Gravity Waits for No One.

Because drag goes with v^2 (at the Reynolds Numbers involved) the x and y equations ARE coupled. You don't ALWAYS have to "get" equations from somewhere. You can work them out for yourself. Remembering back to fluids, the equations we worked with for lift and drag of an airfoil were what I was thinking of... Those equations had been simplified to only consider drag force opposite to the flight direction. I guess it just seems counter-intuitive that drag, resolved as a force, would effect an object from a direction perpendicular to the flight path. Gravity Waits for No One.

Have a source for that? Couldn't find it in my fluids books. Gravity Waits for No One.

1. I get laid whenever I choose... Basically daily. 2. I live in California... We skydive and have boogies year-round.

lol, I assume that was tongue in cheek? If not, I guess it depends on what the end use of the calculation is... If it was for a math or engineering class, I would at least want to know what the variables were to develop a valid and complete list of assumptions. I would hope that any instructor worth their salt would at least appreciate their students being thorough about examining a problem. Gravity Waits for No One.

Where did you get your equations? I'm not necessarily saying they're wrong, just confusing to me... Breaking down the first eqn doesn't make sense how that could be right. if it is, it seems like it would have more to do with the linear momentum of the skydiver and not the drag. I could see how this eqn would make sense if it described the absolute velocity, but not if it's supposed to be for just one component (x or y). dVy/dt = ay = = Fy/m = g - (0.5*C*p*Vx^2)/m + (0.5*C*p*Vy^2)/m Gravity Waits for No One.

If you separate vertical forces from horizontal, and only look at the vertical, then you're left with gravity, the vertical drag force component, and vertical lift force (if any). It's not horizontal drag force that affects the vertical acceleration component... It's the vertical lift force. If the person was tucked into a symmetric ball position, then the effect of the horizontal velocity would be negligible. Also, the equations you presented don't take into account the variation of air density as a function of altitude... An effect that can make a skydiver's velocity vary as much as 10mph. Gravity Waits for No One.

There's not an individual formula that I'm aware of that will solve for speed or height as a function of time for a whole skydive. You would have to break it down into at least two calcs. Even then, your results won't be exactly accurate for the beginning of the skydive due to the forward speed of the aircraft, unless you're talking about a balloon jump, and then that would be easier to calc. In the beginning of the skydive the jumper has a linear momentum in the direction of the aircraft's flight. There is drag force in the direction of the relative wind (which begins roughly parallel to the ground and transitions to roughly perpendicular, and aligned with gravity). And finally there is the force of gravity. This transition period is known as "the hill". During this period, depending on the orientation of the skydiver, there can be some amount of lift generated from the horizontal component of the skydiver's velocity, which can complicate the calc... I'm not really sure how much that is, but it might be negligible for your purposes. If you were to look at a balloon jump, accounting for the velocity with respect to time is easier. And like I mentioned, it might not be a whole lot different than a skydive out of a moving aircraft. In this type of jump, there is only one initial force, gravity in the vertical direction, and the velocity is zero, so the drag force is zero. Assuming the skydiver is stable in only one position, then you can use standard cals for a falling object (http://www.grc.nasa.gov/WWW/k-12/airplane/falling.html). But you don't know the Cd... What you do know, or can make assumptions about, is the terminal velocity in a particular body position, for a typical skydiver. Calculating a "real" Cd for a skydiver at more than just an instant would be nearly impossible... Way too many variables. However, you can back calculate from your assumed terminal velocity... Which again, can vary widely based on more variables than anyone would want to think about. Assuming again that the skydiver is in a stable position, with a constant Cd, once the skydiver reaches terminal velocity (which is only theoretical), he/she actually starts slowing down. This is because, as the skydiver falls, the density of the atmosphere increases, which increases the drag force until the skydiver ends the freefall portion of the skydive. Furthermore, if you care, the density of the air is also affected by temperature, which typically increases as altitude decreases... That slightly counteracts the first density change I mentioned which is due to the weight of the atmosphere compressing itself. Eventually, for a belly-to-earth skydive, you should find that it takes about 10 seconds to reach terminal velocity and at that point the skydiver has lost about 1000ft of altitude. Once terminal (theoretical) is reached, then the skydiver's altitude decreases by about 1000ft every 5.5 seconds for the remainder of the skydive. Let me know if you have any other questions. Gravity Waits for No One.

That's effin lawyers for ya... Gravity Waits for No One.

Here's what we're planning to go with... Both configurations of the Lightning Ball design (and the vector formats for lasermarking, etc) And for the business cards, row 3 for the fronts, and row 4 left for the backs. http://medsparkllc.com/docs/MedSpark_cards3.pdf We still need to think about possible changes to the colors and fonts. Thanks for all the votes and comments! Gravity Waits for No One.

So, we put together some pretty cool business cards with the first logo and now we've decided to go to the last "lightning ball" design, as pretty much everyone I show the logos to chooses that design as their favorite... Aside from the fact that it's not as functional for all forms of media (lasermarking, embroidering, etc), and it doesn't have as much if a "big corporation" feel, it does look pretty unique. And it's actually been the favorite design of ours from the begining, it was mostly just the complications with applying it that turned us off the most. little "m" big s""? So these are the cards we had designed of logo 1a: http://medsparkllc.com/docs/MedSpark_cards2_blueII.pdf But now that we've decided to go with the page 8 logos, these are the variations we're considering (we have to choose one that's in raster format and one in vector, so that's why the"crappy" looking logos are in there) http://medsparkllc.com/docs/MedSpark_logo_concepts3.pdf I like page3-#2 and page4-#2 the best. We did decide that we like the "M" and "S" in caps or larger than the rest of the text. Gravity Waits for No One.

So, we put together some pretty cool business cards with the first logo and now we've decided to go to the last "lightning ball" design, as pretty much everyone I show the logos to chooses that design as their favorite... Aside from the fact that it's not as functional for all forms of media (lasermarking, embroidering, etc), and it doesn't have as much if a "big corporation" feel, it does look pretty unique. And it's actually been the favorite design of ours from the begining, it was mostly just the complications with applying it that turned us off the most. Gravity Waits for No One.

Lol, true, true. Good thing our primary product is mechanical and not electrical/electro-mechanical. Which logo did you like the best? Gravity Waits for No One.

Ahhh, you're probably correct Gravity Waits for No One.

Totally. I just sent an email to our designer explaining our interest in the first and last designs and our concerns with them... Maybe he'll be able to come up with something that is the best of both worlds. Gravity Waits for No One.

I'd say that it's fairly important that the logo represent the company's products, goals, or values. Others may not place much importance on representing these things, though- I think it's really up to you! However, I'm prone to agree with you that it is kind of important. If it were me (and I know it's not :o), I'd consider working with the designer to use the first design or two as a basis for a more representative logo, assuming time and budget allow for further revision. Well, the designer is actually doing this for free for us, but there's obviously a limit to how much we can ask for... I would really like to develop a representative logo, but I really don't know what would fit well with our logo. When I came up with the name MedSpark, it was half because it sounded cool, and half because we design medical devices and we "spark" new ideas/products into reality. The choice of spark had essentially nothing to do with electricity or fire, as most of the devices we develop are mechanical, with only a very small subset being electromechanical. And "Innovation Ignited" was the same thing... Obviously we're not planning on catching stuff on fire (hopefully, lol), a lot of it had to do with that it sounded cool. Everything we came up with that was directly related to what we do either was already in use by another company or didn't roll off the tongue well. Maybe to some degree we need to do the same thing with the logo? I dunno. The last round 3D button design does have a little more going for it that just the votes though... The design was apparently of "introduced" to the market with the Hayes Medical "Ball" logo (see attached), which was the company my business partner founded like 20 years ago. It apparently won a lot of recognition among the graphic design community at the time, winning 1st place in national and international logo competitions and making it into several text books. So, there's some sort of connection there to my business partner's past. And, the lightning bolt in the center was actually created from a picture of a unique art form that I developed that uses high voltage electricity to burn wood... Neither directly relates to our company, but both of us do have a connection to elements of the logo. Not that all that should provide enough justification to use it though... Too bad developing a corporate identity can't be more like math. Gravity Waits for No One.

Like this? http://pt.wikipedia.org/wiki/Umbrella_Corporation lol? huh? Gravity Waits for No One.

Very good points. From the poll results the last two "3D button" designs are definitely the most popular, and even though I really like the way they look, I have to agree with you that they aren't very unique looking and probably won't be very recognizable as the MedSpark logo from a glance. And then there's the problem with lasermarking that logo. As far as unique logos go, I like the first one, as it's not likely to be confused with any other logo out there. My concern about that logo is that I'm not sure it has any connection to our name or what we do. It sort of looks like a point-source of light. Maybe that's not as important as I'm thinking it to be? Gravity Waits for No One.

Nope, haven't made a decision yet, but we're narrowing it down... Thanks a lot for your votes!!! Gravity Waits for No One.