Re: Scary Statistic - $$/Flight

Thanks for that. I got my price just from the price of fuel grains that I found on some website. Even if I could get the price of Fuel grains that would be fine.

Nick

For instance, I got to the HyperTek page and see this price list: So how does this translate to cost of. (Do all J's use the same number of Fuel grains and is altered by the various size of cc and orifice?):

HTek Hybrid J110 HTek Hybrid J115 HTek Hybrid J120 HTek Hybrid J150 HTek Hybrid J170 HTek Hybrid J175 HTek Hybrid J190 HTek Hybrid J220 HTek Hybrid J250 HTek Hybrid J270 HTek Hybrid J300 HTek Hybrid J317 HTek Hybrid J330

Part Number J Motor System and Components M.S.R.P. HT-J440-54-MS Standard J 440 cc 54mm Motor System $176.00 HT-JS440-54-MS As above with upgraded SS Injector Bell $203.50 HT-J835-54-MS Hammerhead J 835 cc 54mm Motor System $198.00 HT-JS835-54-MS As above with upgraded SS Injector Bell $225.50 HT-J-IB J Motor Injector Bell $77.00 HT-JS-IB J Motor Injector Bell with SS flame shield $104.50 HT-440-T 440 cc 54mm Oxidizer Tank $44.00 HT-835-54-T 835 cc 54mm Oxidizer Tank $66.00 HT-JLKVO-MSC O-Ring 2-010 50pcs J Kline Valve $10.00 HT-JTO-MSC O-Ring 2-112 50pcs J Tank (All) $10.00 HT-JGLMTO-MSC O-Ring 2-210 50pcs J Grain $10.00 HT-440-VT 440cc x 54 mm Vent Tube $4.40 HT-J835-54-VT 835cc x 54mm Vent Tube $4.40 HT-J835-VT 835cc vent tube (for old style tank) $4.40 HT-440ORF-MSC Orifices (.076, .098, .125, .172) each $2.20 HT-835ORF-MSC Orifices ( .125, .172) each $2.20 HT-J-FG Standard J Fuel Grains (each) $33.00 HT-JFX-FG HyEFX J Fuel Grains (each) $44.00

Our club "bought" our 64lb bottle for about $200. When we need a refill they just give us a new bottle.

Buying the bottle was the best versus renting on a monthly/yearly basis.

The bottle is considered an investment by the club. We charge for nitrous what we pay for it, plus a 10 to 20% surcharge to cover equipment repairs and oxygen. We have a spreadsheet listing the cost for every size of Hypertech tank. We don't have Rattworks and others listed simply because no one has one yet.

Brian Elfert

Tank size, yes. More oxygen (nitrous) more burn. The tables at the bottom show the number of configurations for each system. An 'I' can fly twice on the same J system grain (so consider $15 for each 'I' flight grain cost). Each tank will take a different amount of nitrous which is your large variable. Nitrous comes in 2 forms (maybe more). For laughing gas, it's pure and cheap (the $1.xx/lb you read about). For auto racing (and us) they add stink so you don't go huffing it. If you get it from an auto retailer, it could be $3 or $4/lb! All launches (including individual 'I' launches) will take a puff of O2, 2' of speaker wire (some snip the end and reuse), and some zip-ties. Not everyone replaces O-rings, but they're cheap in my book. M launches have been known to damage the fill tubes (and a stuck rocket can melt a whole lot-o aluminum).

I didn't see a table of the number of lbs per tank anywhere, but Wayne mentions 3/4lb for the 440. So for instance you have the 440 tank, a $30 grain, 3/4lb of nitrous at $3/lb (assuming you don't dump and the density is giving you a good fill). Then 2 Orings, 2 zip ties, 2' wire, quick wrap of electrical tape, the O2 puff and a short section of vent tube (reusable usually) . Maybe a buck? $33, $34 call it $35 including occasional long fills. Do you include igniter cost with the APCP motor launches?

Wayne also has an 'M' cost comparison, though I think the numbers might be pretty old:

Starrocketry

Pratt

GreatLakes (specials page)

-----------------------------

Some ballpark stats for hybrid costs from a couple years ago:

Sorry, would have put this in my other post if I'd read the whole thread first. Hybrid motors tank capacity:

Sorry, would have put this in my other post if I'd read the whole thread first. Hybrid motors tank capacity:

Some ballpark stats for hybrid costs from a couple years ago:

Sorry, would have put this in my other post if I'd read the whole thread first. Hybrid motors tank capacity:

Thanks for all the posts. This is what I came up with from all the references (give or take a little - does not include hardware or ignitors):

HTek Hybrid I310|54|621|310|Y|17.50 HTek Hybrid J115|54|678|115|Y|35.00 HTek Hybrid J120|54|756|120|Y|44.00 HTek Hybrid J170|54|727|170|Y|35.00 HTek Hybrid J190|54|833|190|Y|44.00 HTek Hybrid J250|54|737|250|Y|35.00 HTek Hybrid J270|54|801|270|Y|44.00 HTek Hybrid J315|81|1022|317|Y|47.45 HTek Hybrid J330|81|1028|330|Y|47.45 HTek Hybrid K240|81|1448|240|Y|47.45 HTek Hybrid L200|111|2646|200|Y|99.61 HTek Hybrid L225|111|2790|225|Y|129.61 HTek Hybrid L350|111|3050|350|Y|99.61 HTek Hybrid L355|111|2855|355|Y|129.61 HTek Hybrid L475|111|2820|475|Y|99.61 HTek Hybrid L535|111|3009|535|Y|129.61 HTek Hybrid L540|111|4641|540|Y|105.32 HTek Hybrid L550|111|3081|550|Y|99.61 HTek Hybrid L570|111|4770|570|Y|135.32 HTek Hybrid L575|111|4843|575|Y|105.32 HTek Hybrid L610|111|3076|610|Y|99.61 HTek Hybrid L625|111|4911|625|Y|135.32 HTek Hybrid M1000|111|9109|1000|Y|155.00 HTek Hybrid M1010|111|9296|1010|Y|195.00 RATT Hybrid H70|29|183|70|Y|10.90 RATT Hybrid I80|29|352|80|Y|15.07 RATT Hybrid I90|29|500|90|Y|15.07 RATT Hybrid K240|64|1801|240|Y|42.00 AT Hybrid J145|54|835|145|Y|29.95 AT Hybrid J170|54|727|170|Y|29.95 AT Hybrid J210|54|850|210|Y|29.95 AT Hybrid K485|54|1688|485|Y|42.01