Hi All,
Being a builder of a classic, I am wondering how this affects me and why I
have not heard of pip pins being used. Am I to redux a hard washer to the
starboard spar tip and buy a pin. Guidance needed for a slow classic
builder.
Troy Maynor
N120EU Monowheel Classic
Left to finish:
Paint,interior,engine install, wiring.
> -----Original Message-----
> From: owner-europa-list-server@matronics.com
> [mailto:owner-europa-list-server@matronics.com]On Behalf Of Andy Draper
> Sent: Tuesday, February 10, 2004 4:33 AM
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Wing spar pins
>
>
> <andy@europa-aircraft.com>
>
> Dear All,
>
> I will confess that I have only looked at a few of the postings
> about the spar pins, but what I have seen indicates that the main
> question is about why there is only one Pip pin type spar pin and
> why this one should be on the port side. The reason is due to
> the layout of the spars.
>
> During static load test, it was discovered that, at high loading,
> the tip end of the starboard wing's spar began to slide aft off
> of the port pin. The further it moved the greater the bending
> force it applied to the pin, making it yet easier for the spar to
> slide off it. On the first test, the spar came off the pin (at
> around the equivalent of about 7.5 'g' I should add) allowing the
> wing to rotate and the spar tang to slice its way through the
> fuselage bottom. It was clear that we needed to prevent the spar
> end to slide aft when under load.
>
> Initial thoughts went to bolts and nuts, but this would make
> rigging and derigging slow and labourious (we fitted this
> arrangement to the first XS, so we know from first hand). The
> pip pin was tested and proved to work well. The loads on the
> pips meant that a hardened steel washer was required to prevent
> them damaging the spar bush, hence its inclusion. However, due
> to the high cost of the pip pins and as it was only needed to
> secure the end of the starboard spar (the spars overlap each
> other such that the port spar is sandwiched between the seat back
> bulkhead and therefore has no possibility of moving) it was
> decided to stay with the tried and tested high strength bolt with
> its welded in Allen key.
>
> I hope that I have not missed the real thread of the discussion,
> but perhaps the above will answer some questions anyway.
>
> Best Regards
> Andy Draper
>
> Technical Director
> e-mail andy@europa-aircraft.com
>
>
> >>> "Fergus Kyle" <VE3LVO@rac.ca> 10/02/04 03:27:33 >>>
>
>
> ----- Original Message -----
> From: <DuaneFamly@aol.com>
> To: <europa-list@matronics.com>
> Subject: Re: Europa-List: Wing spar pins
>
>
> |
> | Ferg,
> |
> | Seems to me by the response that a PIP pin in the starboard
> side would be
> bad
> | as long as it inserted and removed easily. Any problem with the strength
> of
> | the PIP pin? It could also be backed by washers as on the port side.
> Wouldn't
> | hurt?
> |
> |
> | Mike Duane A207
> | Redding, California
> | XS Conventional Gear
> | CM & rudder pedals with cables installed. Working on tailwheel
> and baggage
> | bay. Trial fit of top and both wings. The wings fit! Conventional gear
> soon.
>
> Mike,
> Well, I don't know. I kept the bolt version starboard side,
> 'cause the manual said to. No, I don't think there is any problem with the
> pip-pin's strength since it's used portside, but the extra cost of the
> 'ears' isn't utilised, so why use it. Peter Zutrauen had it right when he
> mentioned the need for it portside, but I don't see how it can be
> needed on
> the starboard. My only caution there was the need to pen it in with the
> original fixture since the dimensions MIGHT keep the ears in and allow the
> starboard pip-pin to vibe out. If you use the retainer specified in the
> manual, what is the advantage of the pin-pin? How would you apply the
> washers, since no dimension is given (might be same as port) and pin is in
> the cup...........?
> Just mulling...........
> Cheers, Ferg
>
>
|