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Author Topic: Pure bone idleness. Right thrust VMC Bird Dog?  (Read 227 times)
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TheLurker
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« on: July 22, 2020, 08:57:59 AM »

OK, it's one of those, "How long is a piece of string?" questions, but anyone prepared to indicate a good starting value for right thrust for a (rubber powered) VMC Bird Dog?  Would be nice to minimise the need for / obviate shims .

 I assume the built in down thrust is about right.

Cheers,
Lurk.
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Squirrelnet
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« Reply #1 on: July 22, 2020, 09:38:14 AM »

About 2-3 degrees would be about my guess. Maybe less if you want the torque to turn the model but then the turn may open out as the power runs down.
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Invader3
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« Reply #2 on: July 22, 2020, 02:06:01 PM »

FWIW Lurk, my VMCBD (which has whizzed past Squirrelnet's head) has a 1.5mm downthrust packer  and a 1.5mm right thrust packer.  It was my first Indoor model, though, so I can't guarantee it was warp free! Cheesy

Seems to circulate OK in Berensfield which is a fairly small hall compared to Walsall etc.

HTH,
John
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Pete Fardell
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« Reply #3 on: July 22, 2020, 03:01:18 PM »

"A tad" is generally the correct amount of side thrust for these kinds of models. That usually means you can get away with relatively thin, barely noticeable shims for the "tad more" or "tad less" adjustments.
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TheLurker
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« Reply #4 on: July 22, 2020, 03:49:35 PM »

Thanks all.

Quote from: Invader3
... a 1.5mm downthrust packer  and a 1.5mm right thrust packer
...OK in Berensfield which is a fairly small hall...
That's very helpful.  I think Trinity is slightly larger than B/field so that's good to know as well.

Quote from: Pete Fardell
"A tad" is generally the correct amount ...
How many tads to the attoparsec?  Smiley

Quote from: Squirrelnet
About 2-3 degrees would be about my guess.
That would have been my fallback position had the HPA Massive not been able to supply experimentally determined values.
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ZK-AUD
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« Reply #5 on: July 22, 2020, 07:44:01 PM »

I work  in Tads and Microtads

Some years back I had one of those lightbulb moments when I suddenly wondered why we build beautiful models knowing that they will need thrustline adjustments and then spoil them with sundry bits of ply, card, roughly hacked balsa and grass stems jammed in the back of a nose block half out of the hole.  I swear some of my efforts looked like Worzel Gummidge on Meth.

In fact  a simple thrustline adjuster is very easy to make and the Bird dog with its wide nose is an ideal subject for it.  I've noticed that our FAC colleagues in America often use adjusters and you sometimes see them shown on American plans - pretty sure I've seen them on Pres Bruning plans.

Nothing as good as being able to dial it in easily and accurately
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billdennis747
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« Reply #6 on: July 23, 2020, 02:39:54 AM »

Now that tads are no longer available through SAMS models, I have started breeding gnats.
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TheLurker
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« Reply #7 on: July 23, 2020, 03:37:38 AM »

Quote from: ZK-AUD
I swear some of my efforts looked like Worzel Gummidge on Meth.
An arresting image.  You owe me a cup of coffee and a new keyboard.  Smiley

Quote from: ZK-AUD
In fact a simple thrustline adjuster is very easy to make...
I've experimented with such things, my VMC Camel has a spare(3rd? 4th?) NB with one of my homebrewed efforts affixed, but my fabrication facilities and, more importantly, skills really aren't up to it.

Quote from: billdennis747
Now that tads are no longer available through SAMS models, I have started breeding gnats.
That was disappointing news.  Just have to hope that Mike Woodhouse doesn't shut up shop any time soon as I couldn't find indoor strip and the other odds & sods that SAMS used to sell on the VMC site.
« Last Edit: July 23, 2020, 03:55:52 AM by TheLurker » Logged
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