To: Dragonfly who wrote (3941 ) 4/17/1999 5:27:00 PM From: Mr. Adrenaline Read Replies (1) | Respond to of 29987
You ask some good questions - But, wouldn't it also be prudent for a company launching a new type of service (a constellation of intercommunicating LEO sats hasn't been done before on this scale) to be extremely conservative in the claims it makes for replacement frequency for its assets? Yup. It sure would. But, you gotta quote your numbers, conservative or not. Insurance companies have lawyers working for 'em!So, do we know that Iridium sats launch with 5 years worth of fuel? I don't know. The only we can bet on for sure is that they have at least five years worth. They may have the same situation, however… Some sats have more life due to which launch vehicle they launched on. But, they also may not. They are a lot lower. It is quite possible that the launch vehicle put them directly into their desired orbit - the higher the orbit, the more difficult that becomes. I am not very familiar with the Iridium satellite.Do we know the consumption rates for the sats that have been in orbit for a year or more? Is there a way to find these things out? Someone knows, that is for sure. I am sure that would be closely held info, however..If a Delta-launched G* sat has 20 years worth of fuel, and Loral regularly manufactures GEOs with a lifespan in excess of 14 years, is it then safe to say that at least some of the G* constellation will last twice its estimated lifetime? I am sure that some of those satellites will be with for quite some time. Who knows? A couple could make it to their 14th birthday.Wouldn't the additional usage of these be worth the hassle/cost of launching all of them on Deltas? 7-13 extra years is a lot. Delta's are pretty expensive. They are also very popular - meaning it would be tough to book every single one for a whole year. And then the (mechanical) design life isn't such that you could reasonably expect enough of them to make it to years 14 & 15. Regards, Mr A