only)
All very good valid points. Thanks for the post!
My concern would be with any side-loads on the brackets, but that could
likely be mitigated.
Cheers,
Pete
A239
On Mon, Nov 21, 2011 at 5:48 PM, ptag.dev@tiscali.co.uk <
ptag.dev@tiscali.co.uk> wrote:
> ptag.dev@tiscali.co.uk>
>
> Hi! Frans/Peter/all.
> I would draw your attention to a simple fact that when the flaps are
> extended at 82 knots a large proportion of the aircraft weight is
> carried on the flap hinges. The hinges at the outboard end of the
> flaps are integral with and cured in place as part of two ribs which
> extend over the full width of the wing which in turn also is cured and
> envelopes the wing spar thus spreading any loading over a massive part
> of the wing structure.
>
> These structural factors are I would venture to suggest likely
> stronger than any integral tie down that could be separately
> constructed into the wing anywhere else without such considerable
> weight increase when an existing potential facility is already
> available.
>
> With regards to receiving snatch blows through the aircraft "bucking
> about" this is entirely without foundation since on tying down through
> these points it is possible to load up and deflect the main gear legs
> to ensure the system is constantly in tension.
>
> In conclusion I can advise that G-PTAG has always been tied down in
> this manner and has withstood some severe gusting wind conditions
> without any damage ensuing what or where ever over it's 900 hours life
> time. However all this advice is provided without liability as to the
> engineering capability suggested. In other words why don't you all do
> as you prefer but with the benefit of Neville Eyre's information I
> suggest you establish your own aircraft's integrity with regards to the
> type of block in use.
>
> May I thank Neville Eyre for his kind intervention on this matter and I
> can confirm that the blocks on G-PTAG are aluminium alloy and were part
> of it's original Mono Wheel Kit since the aircraft was originally built
> as a convertible so embodying all things Trike and Mono together.
>
> Best regards
>
> Bob Harrison G-PTAG
>
>
> -----Original Message-----
>
> From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-
> server@matronics.com] On Behalf Of Frans Veldman
>
> Sent: 21 November 2011 16:11
>
> To: europa-list@matronics.com
>
> Subject: Re: Europa-List: Eye bolt tie down through wing/flap hinge
> block (trike only)
>
>
> nl>
>
>
> On 11/18/2011 08:04 PM, Bob Harrison wrote:
>
> > Hi! Herewith a photo of the tie down location on the wing/flap hinge
> block
>
> > on G-PTAG .
>
>
> Ehm, the flap hinge is designed for holding the flap in position.
> Tying
>
> down the aircraft with it imposes the hinge to possible jerking
> loads,
>
> in a different angle than the hinge is supposed to receive during its
>
> intended use. I remember some notes about not using pencil marks on
> this
>
> apparently sensitive and critical part. Can anyone make an educated
>
> guess whether using this part as tie down point would not compromise
> the
>
> attachment or strength of the hinge?
>
>
> Frans
>
>
|