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Bernie

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Posts posted by Bernie

  1. 17 hours ago, kasper said:

    Hmmm  I'm using LIFEPO4 chemistry which is not the lightest lithium battery (but quite a bit less flammable) and I have a 14.5kwh battery setup for the Sapphire that with the BMS weighs in at 88kg before I start slotting it around the airframe. 

    Prorata for the capacity difference my setup is exactly the same kg/kwh as Ducati get ... maybe I am on the right track. 

     

    Admitted my 88kg does not include the battery boxes I've built into the new wing and behind the seat but they are all vac bagged carbon and very light so my system is stacking up so far.

     

    My concern with the Eflyer is that they are going to be using a lot of power even in economical cruise to stay up there so they will need lots of battery ... and these things are still heavy per kwh. 

     

    Just think

    - Eflyer has 110kw motor,

    - guessing it uses 30-40kw to fly at endurance

    - they claim 3hrs endurance

    - they need around 90-120kwh of battery

    - LIFEPO4 systems weigh 6kw/kwh

    This would imply a battery pack of around 540-720kg

    That is not believable.

     

    Even if using really good (very flammable) lithium batteries its not much better - the current Tesla 100kwh lithium pack comes in at 625kg.

     

    I just cannot see how they can possibly get the performance they claim out of the available technology.

    Did you make your own BMS or came with your battery pack?

    Bernie.

  2. 11 hours ago, onetrack said:

    Somewhere in outer space, right about now, a Martian spacecraft is missing its lower landing thronomister, and they've had to activate their Martian Space Locator Beacon (MSLB) to call for Martian spacecraft backup.

    There's some very worried and stressed-out Martians out there right at present, and I feel for them.

     

    Seriously - stuff falling out of our sky is to be expected, given the huge amount of equipment we've launched up into Space since 1957, and given what intergalactic debris is already hanging around out there, that gets caught in our gravitational system.

     

    https://museum.wa.gov.au/explore/articles/surprised-while-sunbathing-on-binningup-beach

     

    If this had gone through their roof, the couple might have had to do more than replace a tile, and fix a couple of holes in the roof and ceiling!

     

    https://www.abc.net.au/news/2019-07-12/four-decades-on-from-skylabs-descent-from-space/11249626

     

    Looks like a flucks capacitor. 

  3. 19 hours ago, F10 said:

    Bernie, wow! Nice looking Fox! It looks in fantastic condition. You do know it will tow much better with the wings folded....Haha, I see you have the turtle deck removed so unfolded for the pic. I see you list as a non pilot, are you going to learn on the Skyfox? If so good idea, its an easy and friendly aircraft to fly and fully conventional, center stick and toe brakes. Good choice!  

    I did back in the day achieve my flying certificate in that Gazelle and bought it. I made the trailer and was trying for fit in the Pic.

  4. 20 hours ago, farri said:

    Flying a stretch of the Mulgrave river, in North Queensland, Australia!

     

    How about this music, then? 😉

     

     

     

    There's a few spots I wouldn't mind casting a line. Like the video as well.

    • Like 1
  5. 5 hours ago, onetrack said:

    Spacey, you've obviously got an internet connection, and a computer of sorts - home delivery of all types of food is just a mouse click away. 

    Not if you live a hundred Ks from the shops.

    Bernie.

  6. My Gazelle 3382. I was told was the first to change from GA the AUF, I bought it from training school and achieved my flying certificate in it. and cross hired it back to the school.

    Bernie.  

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