Re: Re: Goins' Cat II DLG

From: Bill Gowen <b.gowen_at_earthlink.net>
Date: Sat, 3 Feb 2007 20:07:06 -0500

As Chris's soon to be former flying partner I'll have to say I disagree with him on the DLG in Cat 1. The prevailing mantra about DLG seems to have always been "easier on the thrower, harder on the model". Since Cat 1 gliders are built as light as possible and still be able to take the launch stress, I don't think DLG is going to work as well as javelin launch. My Cat 1 HLG's are thrown with as close to a straight line motion as possible. A Buxton type throw would result in shards of balsa all over the room. (Jim, I'm just jealous that I can't throw like that!). I think a DLG launch would be even more stressful on the airframe.

Time will tell.

The right-right pattern can definitely be a problem in transition. I almost always have transition problems with my low ceiling gliders. If you hit a little too steep on the bank and launch angle you get a straight up stall at the top. If you get a little too much bank or too low an angle you lose a lot in translation - er transition. Sort of an almost spin-in. A good launch for me is when the model banks at the top after losing most of the launch speed but is still flying above normal glide speed and not losing altitude. A good day is when I can get 2 like that out of 9 launches.

  ----- Original Message -----
  From: rreyno2001
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Saturday, February 03, 2007 7:46 PM
  Subject: [Indoor_Construction] Re: Goins' Cat II DLG


  --- In Indoor_Construction_at_yahoogroups.com, "Bill Gowen"
  <b.gowen_at_...> wrote:
>
> I'll let Chris answer this but in general low ceiling indoor
  gliders launch and glide in the same direction because of space
  limitations in the usual flying sites.
>

  Ok, I can see that as long as you don't run into transition
  difficulties.

  Following a thin bit of logic here while not wanting to be
  contentious: Chris, you're suggesting that very light gliders using
  the DLG technique could be transitioned to a higher relative
  altitude than their JLG cousins if I have your point. That would be
  a good thing.

  However if you need to add tip re-enforcment and balancing it with a
  heavier opposite tip, then we no longer have as light a glider as a
  JLG without the added structure. Not to say that it can't happen
  because I would like to participate in seeing how it goes.

  In our 37-39' flying site, I can't get enough height with a 7-8 gram
  flapper glider (65 year-old arm) and consistently come up probably 8
  feet short. With a 10-11 gram flapper I can likely get there with
  more practice and the right airplane. I'm hoping that a lighter DLG
  could be the answer to get in the range of the site record which is
  close to 40 seconds.....this is at nearly 7000' altitude by the way.

  Interesting how DLG even in the indoor world is having an energizing
  effect for HLG!

  Regards, Randy



   

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Received on Sat Feb 03 2007 - 17:07:17 CET