Do not even think about leaving out the rear floor !!
Those early suggestions for ultralights proved to result in
structural damage .....
Adding the floor turns the lower fuselage into a box beam,
GREATLY increasing its strength ! The difference in weight
is 5 lb. tops ... well worth it ! You can use the mylar or
Lexan sheet method to locate the holes, then transfer them
to the floor aluminum. Put pieces of blue styrofoam between
the bulkheads, with plywood on top, so the bulkheads aren't
bent, and the load is spread. Of course, be sure the whole
bottom of the fuse is supported on a table before crawling
in there ... ;-)
--
......bobp
bobp@prosumers.ca
bobp@pattersys.com
http://www.Pattersys.com
http://www.amway.ca/BobPatterson
Any views expressed in this message are those of the individual sender
and do not necessarily reflect the views of any other entities or persons.
Any action taken as a result of the contents of this email is totally the
responsibility of the reader.
On September 15, 2010 03:35:10 pm Marc & Janine wrote:
Thank you Ron for the reply.
Maybe I wasn''t that clear in my mail.
What I ment is to leave the aft parts of the inner floor installation out
of the tailcone.
The building manual gives the recommendation when using the plane for
Canadian Ultralights and aircraft to be powered by Rotax 582''s to leave
these inner floor channels out. I''m thinking to install only up to the
first 2 front bulkheads(A and B) and then using an baggage wall. The ELT
and battery(box) could be installed on separate reinforcements.
I totally agree with you about the bagagewall and bagagecompartment.
Also my compliments towards your helpful internet site, it has helped me
already answering many questions.
Kind regards,
Marc van Hulzen
PH-REB
-----Oorspronkelijk bericht-----
Van: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com] Namens Ron Shannon
Verzonden: woensdag 15 september 2010 20:10
Aan: rebel-builders@dcsol.com
Onderwerp: Re: [rebel-builders] Fw: bagage compartment part of the airframe
stiffness?
By the baggage compartment I assume you mean a wall at the rear of the
baggage area. I think dispensing with it for weight savings is both a bad
idea, and to a large extent, a red herring. First, let's look at the real
weight cost. Roger Hoffman built a nice baggage wall that added just over 4
lbs. I tried to copy his design and make it even stronger, with all
components adding about 5 lbs.
Is it realistic to consider doing much with the plane without at least some
protection to keep baggage, tools, oil, water & other spares from sliding
into the tailicone and upsetting the CG, or worse, jamming controls or
cables way back where you can't even get to them? Not really. If you're
going to keep even just the big things from rolling back into the tailcone,
upsetting the CG, you need to have at least a cargo net of some kind -- or
never carry any baggage or other loose items up front. Even the most
rudimentary, but strong, net system is likely to weigh at least 2 lbs.,
including mountings. If that number is even close to the ballpark, the real
question becomes whether having some kind of true wall is worth the extra
2-3 lbs. cost over a strong cargo net. With anything less than at least a
net, the only way to avoid the risks of loose gear is to never carry
_anything_ in the plane. That not only reduces the functionality of the
airplane a great deal (most would say, completely) but also makes it hard
to achieve a good performing CG in many cases.
A full baggage wall protects from shifting weights of all shapes and sizes,
whereas a net may not. What items are we willing to risk getting through a
net? Which of those "allowable" items can we guarantee will never, ever jam
controls, pulleys or cables, ding some coax, wiring, or the ELT when you
need them? Several builders have commented that without a wall, there is
considerable oil canning in the tailcone -- bad for noise, vibration, and
longevity. A wall makes it possible to hold heat in the cabin, a pretty
important consideration in most climates. Finally, a wall looks better.
Compared to a net of some kind, are all those things worth an extra 2-3
lbs.? IMHO, that's a no brainer.
Ron
http://n254mr.com
On Wed, Sep 15, 2010 at 10:15 AM, Mike Davis <mike.davis@dcsol.com> wrote:anyone----- Original Message -----
From: "Marc Van Hulzen" <marc.van.hulzen@dcsol.com>
To: <mike.davis@dcsol.com>
Sent: Wednesday, September 15, 2010 9:10 AM
Subject: bagage compartment part of the airframe stiffness?
I'd like to leave the bagage compartment out of the tailcone because of
the
weight saving. According the manual it seems it no problem but has
experience with it?
Any recommendations are appreciated.
Kind regards,
Marc van Hulzen
PH-REB
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