Current IMPBA P-O/B Tunnel SAW record holder with avg time of 3.358 seconds @ 67.004 MPH.
Owner Worlds fastest record setting Lynx with average time of 3.287 seconds @ 68.451 MPH.
Smocktura Props!
Thanks again for working this out. This is very helpful. But you need to add a "color" factor to your equation-- we all know red boats go faster...
Chief
Good stuff. One thing, 'tho ( and in no way is this a criticism of these efforts) is that the V or voltage value used is based on the nominal starting V which changes (decreases) considerably under load, as I have found after much data collection/plotting on several brands of batteries. The +/- 3% variation likely is a result, in some part, of this phenomenon. The KV is another possibly varying value based on production tolerance and other considerations.
2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
'11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono
Tony, I thought about the same thing, but you had to throw a wrench in there, eh?
LOL
:::::::::::::::. It's NEVER fast enough! .:::::::::::::::
good inforamtion all around.
but, it is a tool for getting an idea of about how fast the boat is going.
nice to have folks that take time and figure things out for us out in the boating world.
GOT TO LOVE THIS FORUM!!!!!!!
2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
'11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono
Within 3mph of my GPS reading for my Vegas running 2200KV, X642, 4S. Nice work.
Last edited by Shooter; 05-13-2011 at 03:53 PM.
Hi Martin.
Vegas (X642 S&B, 1515 1Y): (1.6 x 42 x 2200 x 14.8)/33610 = 65mph (GPS = 62)
When ever i see someone post speeds with gps & they give relavent info like kv, volts, prop, type of hull i like to work speeds out on how i do it just to see how close or far away i am. With the info on your boat i got 60.8mph. Martin.
Martin - Which denominator is correct for Hydro? 33610 or 33300. Both are listed in your first post. Thanks.
I dont actually use that formula but either of those numbers work out quite close to one & other on calculated speeds. On say a 60mph boat both those numbers are only .5mph apart. Martin.
So im curious putting that prop on that 1515 motor how are your temps?(motor/esc/batts) What c rating batts are you running, and what esc? I am planing on running a 4074 2150kv motor in my apparition, i am shooting for 50 mph on 4s. If you hitting 65 mph with good temps then i think my setup should work good.
Here's a spread sheet version (XLS) that I whipped-out.
Bookmarks