Today's Message Index:
----------------------
1. 07:35 AM - Has Low cost ADS-B arrived? (Kelly McMullen)
2. 07:44 AM - Re: How to lift the nose wheel without an engine hoist (Bill Watson)
3. 11:10 AM - Re: How to lift the nose wheel without an engine hoist (Rocketman1988)
4. 11:53 AM - Re: Has Low cost ADS-B arrived? (Bob Turner)
5. 12:25 PM - Re: Re: How to lift the nose wheel without an engine hoist (Kelly McMullen)
6. 12:50 PM - Re: How to lift the nose wheel without an engine hoist (Bob Turner)
7. 03:56 PM - Re: How to lift the nose wheel without an engine hoist (Rocketman1988)
Message 1
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| Subject: | Has Low cost ADS-B arrived? |
Looks like there is a much cheaper option for those that haven't already
invested.
Of course there is much gnashing of teeth for the factory built aircraft.
http://www.flyingmag.com/avionics-gear/instrumentaccessories/ads-b-compliance-699-its-true-sort
<http://www.flyingmag.com/avionics-gear/instrumentaccessories/ads-b-compliance-699-its-true-sort>
Kelly
Message 2
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| Subject: | Re: How to lift the nose wheel without an engine hoist |
On 3/12/2015 10:14 AM, Marcus Cooper wrote:
>
> I havent tried it yet, but in the past some folks recommended filing a plastic
tote with concrete and imbedding a hook in it. Sounds like a nice alternative
to those of us without a eyelet in our hangar floor or the option to add one
but can still pull the tail down.
>
If you look carefully you can see the concrete filled crate I embedded a
hook in to winch the tail down to with a tie down strap. Even though I
have the ubiqutous HF winch, I find it awkward for lifting the nose for
this particular operation. BTW, I load the baggage compartment down
with water bottles.
Kitlog - tail raising and lowering
<http://www.mykitlog.com/users/display_log.php?user=MauleDriver&project=224&category=7984&log=199155&row=2>
You can also see how I used the HF wince to raise the tail and compress
the donuts.
Message 3
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| Subject: | Re: How to lift the nose wheel without an engine hoist |
Kelly said "...They are designed to secure the tail at a 45 degree pull angle for
forces the horizontal stab can generate, not a direct pull vertically or horizontally..."
Not to split hairs here, but that makes very little sense as basic physics tells
us that the "45 degree pull angle" can be resolved by the summation of a horizontal
and vertical components. Therefore, it matters not whether the force
is applied vertically or at a 45 degree angle so long as the vertical force does
not exceed any structural limitations.
According to many that have tied the tail, it takes less than 250 lbs. The force
that the stabilizer can produce is certainly greater than that. Of course,
the stabilizer is mounted to distribute it load, so that needs to be considered.
For me, I will have no issues borrowing the brick cart idea to secure the
tail when necessary.
YMMV.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=439378#439378
Message 4
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| Subject: | Re: Has Low cost ADS-B arrived? |
This just does not smell right. Whether normally certified or E-AB, FAR 91.225
and .227 apply to both equally. 91.227 requires that the position source meet
certain standards. So far Navworks has not stated unequivocally that the gps meets
those standards. And certainly almost no owner can so state with any authority.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=439379#439379
Message 5
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| Subject: | Re: How to lift the nose wheel without an engine hoist |
I don't disagree, however, the method of fastening the tiedown, the
direction of pull etc do matter as to determining the actual structural
strength. Whether rivets are in tension or shear matters. Same for the
threads.
If one loads the baggage compartment to lower the needed force, that side
is good, but you need to protect against banging the tail on the floor.
On Sat, Mar 14, 2015 at 11:08 AM, Rocketman1988 <Rocketman@etczone.com>
wrote:
>
> Kelly said "...They are designed to secure the tail at a 45 degree pull
> angle for forces the horizontal stab can generate, not a direct pull
> vertically or horizontally..."
>
> Not to split hairs here, but that makes very little sense as basic physics
> tells us that the "45 degree pull angle" can be resolved by the summation
> of a horizontal and vertical components. Therefore, it matters not whether
> the force is applied vertically or at a 45 degree angle so long as the
> vertical force does not exceed any structural limitations.
>
> According to many that have tied the tail, it takes less than 250 lbs.
> The force that the stabilizer can produce is certainly greater than that.
> Of course, the stabilizer is mounted to distribute it load, so that needs
> to be considered. For me, I will have no issues borrowing the brick cart
> idea to secure the tail when necessary.
>
> YMMV.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=439378#439378
>
>
Message 6
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| Subject: | Re: How to lift the nose wheel without an engine hoist |
I'd say you're both right, in some circumstances.(!)
If you're talking about the structure (tailcone, spars, etc) then the ideal physics
analysis is very good. At 45 degrees, 71% (actually one over the square root
of two) of the force is vertical, and an equal amount is horizontal.
But if you're talking about pulling out the threads, it is more complicated. The
horizontal force will cause the bolt to pivot slightly, "locking" the bottom
and top of the bolt deeper into the threads, where they are thicker, and thus
have a lot more strength in tension. To visualize this, imagine that the tail
had been tapped oversize, so the threads of the bolt just barely grabbed.
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=439382#439382
Message 7
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| Subject: | Re: How to lift the nose wheel without an engine hoist |
Agreed. It is all just academic anyway because that tie down is threaded for a
3/8" bolt any unless you really messed up tapping the hole, 250 lbs is never
going to pull those threads out...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=439385#439385
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