[AR] Re: Super Loki Dart design documents
- From: "Monroe L. King Jr." <monroe@xxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 03 Sep 2014 05:52:30 -0700
I thought the "Viper" was a 4" version.
Monroe
> -------- Original Message --------
> Subject: [AR] Re: Super Loki Dart design documents
> From: "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
> Date: Mon, September 01, 2014 7:25 pm
> To: <arocket@xxxxxxxxxxxxx>
>
>
> Which is kind of the point I was making.
>
> Troy
>
>
> The higher altitudes from the Viper darts is the result of the 57 lbs of
> propellant compared to the 37 lbs in the Super Loki.
>
> In a message dated 9/1/2014 3:46:44 P.M. Pacific Daylight Time,
> GEORDI@xxxxxxxxxxxxxxxx writes:
> >O25000 great stunt motor but not very efficient. Larger diameter
> >dramatically increases drag, particularly in the le, dense atmosphere.
>
> Not necessarily - for the same aspect ratio and everything else being equal,
> a larger diameter (or actually larger) rocket should be more efficient than a
> smaller one in an atmosphere purely due to *drag* - a larger rocket is *less*
> affected by drag due to the cube-square law. Of course (with everything being
> equal), larger rockets generally go faster due to this fact and will, as a
> consequence, experience more drag so everything isn't equal after all and
> because of this will probably be less efficient. Nevertheless, it should go
> higher hence demonstrated why the operational ceilings for the larger Viper
> darts are considerably higher than the smaller Loki.
> The O25000 probably is a bit short for a really efficient dart motor, but
> its burn time will go some way in making up for that with an efficient dart.
>
> >
> >This is why all the folks flying N5800s are very amusing. No doubt
> >entertaining but highly inefficient. Much of the energy of the motor goes
> >into drag and heat rather than altitude.
>
> Indeed. I'm guessing the attraction is the engineering challenge of dealing
> with the loads experienced with such an aggressive flight profile. Flying
> such flight profiles is incredibly inefficient, however well engineered
> *boosted darts* are the most efficient method of obtaining a certain altitude
> within an atmosphere and gravity field.
>
> Troy.
>
>
>
> >
> >K
> >
> >Ken Biba
> >Novarum
> >Managing Director and CTO
> >+14155775496
> >
> >
> >> On Sep 1, 2014, at 1:28 AM, "Monroe L. King Jr."
> ><monroe@xxxxxxxxxxxxxxxxxx> wrote:
> >>
> >> Yeah, that motor would do it. I just can not afford that one.
> >>
> >> Monroe
> >>
> >>> -------- Original Message --------
> >>> Subject: [AR] Re: Super Loki Dart design documents
> >>> From: "Troy Prideaux" <GEORDI@xxxxxxxxxxxxxxxx>
> >>> Date: Sun, August 31, 2014 8:22 pm
> >>> To: <arocket@xxxxxxxxxxxxx>
> >>>
> >>>
> >>> That O-25000 would be a very sweet motor for a boosted dart :) Very
> >sweet indeed. What was the 5" variant of the Loki again? Viper?
> >>>
> >>> Troy
> >>>
> >>>> -----Original Message-----
> >>>> From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx]
> >On
> >>>> Behalf Of Mark C Spiegl
> >>>> Sent: Monday, 1 September 2014 12:39 PM
> >>>> To: arocket@xxxxxxxxxxxxx
> >>>> Subject: [AR] Re: Super Loki Dart design documents
> >>>>
> >>>> Monroe L. King Jr. wrote:
> >>>>>> So I guess I need to calculate the burn rate and see what COTS has to
> >>>> offer in
> >>>>>> that ball park. Who has the fastest COTS propellant? Has anyone got
> >any
> >>>> hard
> >>>>>> data on that? I'm sure someone out there in Arocket land already know
> >>>> who's got
> >>>>>> the hottest propellant.
> >>>>
> >>>> Cesaroni O-25000???
> >>>> It's a 5 inch motor but might work.
> >>>>
> >>>> Cesaroni N-5800
> >>>> Is a 4 inch motor but only 20kNS thrust
> >>>>
> >>>> For home brew, Kosdon had some quick burning motors. You might find the
> >>>> formulas online these days.
> >>>>
> >>>> -->MCS
> >>
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