[Amps] Hmmmm...Legal limit boiled the oil in the cantena

[Carl]

All thats needed for the rest of the show is some flamethrowers set up in 
the exhaust!

Carl
KM1H



----- Original Message ----- 
From: <donroden at hiwaay.net>
Cc: <amps at contesting.com>
Sent: Tuesday, April 06, 2010 11:48 PM
Subject: Re: [Amps] Hmmmm...Legal limit boiled the oil in the cantena


> All I can tell ya was that I had a couple of 3 1/8 inch coax Bird
> In-Line sections with 50KW elements and they were asking if I had
> anything bigger.
>
> The area behind the second seat was all "open construction" with a 2
> inch diameter antenna sticking out of the roof and looked to be
> capacitivly coupled to the anode of the 4CX15,000 without the benefit
> of any matching network.
>
> maybe a half wave vertical  ( ?? )
>
>
> The guy said he had just been on a contest held in Atlanta at a
> Mariott near Hartsfield International, and someone from the airport
> "ran them all off", threatning to call the FCC.
>
> Some of the cars have remote keying and the "operator" can get fifty
> or sixty feet away before turning on the juice.
>
> They say it's impressive on a humid night.
>
>
> Don WA4NPL
>
>
>
>
>
>
> Quoting Roger <sub1 at rogerhalstead.com>:
>
>> It's all for show.  They don't need near that HP to run them, they
>> don't need nitrous oxide.   More than likely the crank broke from
>> the acceleration and extra power from the nitrous oxide.  Figure the
>> monstrous SWR from a mobile antenna being fed 75000 watts. It'd look
>> like a lightning generator. But it's unlikely they can do better
>> than 50% efficient with the setups. So given 150 KW input they need
>> 201 hp plus change. Given the generators are not 100% efficient AND
>> the output frequency will change with RPM who knows what they get
>> out of them.
>>
>>
>> Carl wrote:
>>>
>>>> At 11:09 PM 4/5/2010 -0400, donroden at hiwaay.net wrote:
>>>>
>>>>> peanut compared to some of the 11 METER MOBILE amps I have seen
>>>>>
>>>>> How bout a 4CX15,000 powered by four 200 amp alternators in a Suburba
>>>>> with a big block 454.
>>>>>
>> That sounds like they are actually using 48 volt alternators.
>> Figuring 60% efficiency gives  37,500 watts input. going
>> conservative means 37,500/800 amps = 46.8 volts which is close
>> enough to guess at the 48 volt alternators, which means over all a
>> very inefficient system. OTOH even a 37KW, 240 generator would only
>> take 49 HP plus change, neglecting losses so maybe 55 HP would be
>> needed.  They might have a problem fitting that relatively small
>> generator under the hood though.  The setup described would have
>> power loss in the alternators, loss in the inverters,
>>>>     I  should be able to drive that amplifier with my VW Beetle engine.
>>>> It should only take about 80 HP
>> 80?
>>>> where is all that power going from
>>>> the 454 bigblock with nitrous oxide injection? A hundred hp would be
>>>> a little less than 75kW.
>>>>
>> or about 45 KW output at 60% efficient.
>> Just remember these are for show, or they'd be coming from the
>> shallow end of the gene pool.
>> If they have to stick with 48V alternators of less the systems are
>> going to be very inefficient which means a lot of lost HP so far
>> more than what we figure would be needed. OTOH it still doesn't come
>> to any where near the amount they are using.
>>>> Sounds stupid to me.
>>>>
>>>> 73
>>>> Bill wa4lav
>>>>
>>>>
>>> A cranks snout is its weakest link and its not designed to be
>>> pulled on by a bank of monster alternators. I dont know if the
>>> CBers are using forged or cast cranks either but they do break.
>>>
>> My guess is, that although the monster alternators don't present a
>> tremendous load, what they do present along with the sudden
>> acceleration does and would probably be the reason for breaking
>> cranks.
>>> Nitrous is stupid but probably the only viable option fo a 10
>>> second run. If done right it wont destroy the pistons. A
>>> supercharger would be safer in the long run but thats in operation
>>> all the time.
>>>
>> A super charger or turbo can be hooked up with a bypass or pressure
>> relief (waste gate) like they do with aircraft so over boost isn't a
>> problem. With a manual waste gate they can be left in stand by
>> except for the run.
>>
>> 73
>>
>> Roger (K8RI)
>>> Carl
>>> KM1H _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>
>
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