Just FYI, I did read the whole thread and you have made a large assumption of a knee jerk reaction.Tuner wrote: ↑Sat May 08, 2021 2:33 pmSee, this is what happens when you don't read the whole thread and just jump right in with a kneejerk reaction instead of applying you maff skilzz. 1 HP = 746 Watts. 30 HP = 22371 Watts / 12 V = 1,864.25 Amps. A large electric fan assembly listed in Summit which has two fans/motors is rated at 50 amps. 50A x 12V = 600 Watts 1 HP = 746 Watts. It is ridiculous to think a fan driven by a single 3/8" belt is absorbing 30 HP.lc-gtr-1969 wrote: ↑Sat May 08, 2021 1:44 amIf you do not believe the data, an if you have access to a dyno- why don't you spend 30 minutes to run up a car and remove the mech. fan and post before and after data? I am sure plenty would be interested.Tuner wrote: ↑Fri May 07, 2021 7:59 pm
That belt is 1/2 or 5/8 inch wide. How much power goes to propelling the mower vs. turning the blades?
Come on people, look at the 5 HP electric motor on your shop air compressor, do you see two 5/8" belts? A 3/8" V belt is not going to deliver anywhere close to 30 HP and last 50,000 miles.
Tuner wrote: ↑Thu May 06, 2021 5:58 pm
Not reasonable at all, 30 HP is just nuts, yellow journalism. 30 HP = 22371 Watts / 12 V = 1,864.25 Amps. Who wants to try again?blackford wrote: ↑Thu May 06, 2021 12:49 pm I'm sorry, but am I the only one who thinks that 30 HP to turn a fan is absurd? So, I would need to take a very powerful 30 HP electric motor that spins the fan up to speed (either directly or by gearing it up) to move the same amount of air as the same fan being spun by an engine? Does that seem reasonable to anyone?
Once upon a time on a chassis dyno on a hot summer day with a 355 SBC short-track car that had no fan at all it started getting warmer than ideal with just a 110V squirrel cage fan blowing at it so we put one of those molded black plastic fans on it about 12"-14" diameter and it did not change the RWHP at all but it did cool the engine just fine so we left it on and made a shroud out of one of the shop's Rubbermaid trash cans that serendipitously was the perfect size, length and diameter, when cut short and attached with tranny cooler zip ties through the heater core and the lip of the trash can.
So, where is your own data? Not theoretical data but real test data. I am genuinely curious.
I follow the engine masters program and they appear to run very well planned scientific tests, but if someone was willing to spend the time with real world actual testing, it would be great to either prove or disprove the theory.
And no, it's not 'maffs skilzz' that will tell you the answer because you have too many variables values placed upon assumptions. You do not know the parasitic drag from the belt, fan blades, bearings etc, but have rather presumed it (unless I am mistaken). You may be correct but when you are plucking frictional drag values out of thin air, it leaves people, quite rightly, skeptical.
Run the data on a dyno, same oil temps same air temps and post back here... I think it would be very interesting.