Today's Message Index:
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1. 04:09 AM - Re: Re: Alaska CH701's (JG)
2. 06:09 AM - Re: Alaska CH701's (kmccune)
3. 11:02 PM - Re: Alaska CH701's (d.shrader)
4. 11:14 PM - Re: Alaska CH701's (d.shrader)
Message 1
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| Subject: | Re: Alaska CH701's |
Gday Wing Builders,
Our extended 701 wings are still going well, no problems. Wouldn't ever
want to go back to the short wing.....
If you're building a wing from scratch, how about having a look at the plan
s
for a 750 wing. That would be heaps strong for a 701. I think it has a
longer spar, so doesn't easy apply to extending an original wing, but worth
a look just for reference. Would anyone with 750 plans like to do a
comparison with the 701 wing??
If the attachment fittings are the same, I'd like to see Zenith offer the
750 wing as an alternative for the 701. That would make the 701 into an
even better STOL machine. The old adage: "....*For good STOL you need lots
of power and lots of wing*....". Got lots of power now with the 912S
- matched with the 750 wing would be tops. Especially for floats.....
The long wing is also really good for matching with engines with marginal
thrust. There=92s a rule of thumb in aircraft design that says that power
required for straight and level flight is inversely proportional the square
of the span loading. So for the same weight, that becomes inversely
proportional to the square of the span. ie ' For a 701 standard wing at
27=92
lengthened to 30=92 - 27 squared divided by 30 squared = 0.81. So it wo
uld
require only 80% as much power to fly the longer wing, leaving the rest to
contribute to climb. Climb at 40 kts was measured to be 100fpm better with
our extended wings. See http://www.stolspeed.com/longer-wing To get the
effect of 20% more power by only adding a few pounds of wing weight is real
good value. And it makes a heck of a difference which you feel right away
when you try it!
Carry on building, it'll be worth the effort......
JG
On Sat, Jul 4, 2009 at 3:34 PM, d.shrader <chilledj@yahoo.com> wrote:
>
>
> kmccune wrote:
> > Dave,
> > The spar tip is clearly longer, but as John knows I am concentrating
> right now on the wing so I have been looking at a lot of 701 spars, both
> long wing and standard.
> >
> > John the pic is in the message before my comment.
> >
> > Kevin
>
>
> Kevin
>
> we just went with JG's idea from stolspeed for the length and the false
> ribs was just easier than the L angle idea for anti-oilcaning we already
had
> the formers and .016 ribs makes the weight negligible.
>
> So where are you in your project and what have you decided on your wings
>
> Dave
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=251411#251411
>
>
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>
>
Message 2
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| Subject: | Re: Alaska CH701's |
Ray , the high jack was my doing, sorry.
The tail is done and the cabin side are done the wing ribs and flaperon ribs are
done, just getting ready for the spars. Gotta build a bench riveter first.
Mine will also be ~400mm longer with the larger/thicker wing doubler and .125"
extrusion. I may copy the spar attach points that Savannah uses as well. The
.125" extrusion is just due to cost considerations for shipping. And I will not
be building slats.
Kevin
[quote="d.shrader"]
kmccune wrote:
>
> Kevin
>
>
> PS sorry for the hyjack Ray
>
> So where are you in your project and what have you decided on your wings
>
> Dave
--------
History is a great teacher if you take time to study it.
Steve Bennett
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251429#251429
Message 3
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| Subject: | Re: Alaska CH701's |
vgstol(at)bigpond.net.au wrote:
> Gday Wing Builders,
>
> Our extended 701 wings are still going well, no problems. Wouldn't ever want
to go back to the short
>
> [b]
JG
thanks for the words of encouragement, and you will get an order for 3 sets of
vg's and tail feathers when we are a little closer to finish line.
Dave
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251551#251551
Message 4
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| Subject: | Re: Alaska CH701's |
[quote="kmccune"]
The tail is done and the cabin side are done the wing ribs and flaperon ribs are
done, just getting ready for the spars. Gotta build a bench riveter first.
Kevin
what is the savana attach point design? Just get a 3x gun and practice i promise
after about 20-30 bucks you'll be fine
Dave
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=251552#251552
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