Goldberg Tiger II Airfoil
Amar Shan
Larry wrote:
>
> Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
> bottom airfoil?
>
Neither. The Tiger 2 (and Tiger 60, for that matter) have fully symmetrical
airfoils.
>
> Do ya think a HP Goldcup .61 would work in the Tigre II .40 ? Tuned pipe
> also.
I've seen it done, but it'll be a tight fit in the nose. The plane will be
quite
overpowered. There are two issues you should address:
1. Flutter. The Tiger 2 is rather prone to aileron flutter when overpowered.
The reason is that the aileron linkage consists of a bent piece of music
wire that just sticks into the soft balsa aileron. In time (and not much
time, either!), the hole enlarges, and the aileron becomes free to move.
Make sure you either: (a) install a hardwood dowel into which the
link goes, (b) encase the linkage within the aileron in epoxy or (c) use
dual servos. I don't like (c) - I'm a firm believer in keeping planes as
light as humanly possible.
2. The plane is very likely to wind up nose heavy, particularly if you like
wild aerobatics and want to move the CG back. Then you wind up
adding lead to the tail...
Both Tiger 2 and Tiger 60 are wonderful flyers. If you can accomodate
the larger plane, it flies just that little bit better ...
Amar
>
> Got to have a lttle extra power :-)
>
> OR would the .60 size just be nifty Thanks aer...@snip.net Larry AMA
> 3716
>
> "Most RC Guys are great- except for one" E-Mail me -God made good people
> overlooked these guys.
Larry
Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
bottom airfoil?
Do ya think a HP Goldcup .61 would work in the Tigre II .40 ? Tuned pipe
also.
Got to have a lttle extra power :-)
RBarkus
Larry wrote:
>
> Hello , I am in the Dark Ages on a subject.
>
> Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
> bottom airfoil?
Seems to me it is symmetrical.
> Do ya think a HP Goldcup .61 would work in the Tigre II .40 ?
> Tuned pipe also.
It would be wild to say the least, but then why build a T2? It is a
nice plane for decent aerobatics with really good wing loading. If you
don't want these characteristics then don't build a plane like this. If
you want raw, stupid power to weight then look up the Ballistic (sp).
Somebody here sells it.... is built around the YS91.
>
> Got to have a lttle extra power :-)
A ST .51 on a pipe would be all that was needed.
Robert
Dick
I'm pretty sure the Tiger 2 airfoil is fully semetrical.
In the process of building a T2 powered by an OS
70 FS. In a month or so, I will be able to tell you
of the outcome.
Larry wrote:
> Hello , I am in the Dark Ages on a subject.
>
> Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
> bottom airfoil?
>
> Do ya think a HP Goldcup .61 would work in the Tigre II .40 ? Tuned pipe
> also.
>
> Got to have a lttle extra power :-)
>
Paul McIntosh
find many planes that handle this speed envlope better than the
Ballistick/YS.91/60% nitro combination.
RBarkus wrote:
> Larry wrote:
> >
> > Hello , I am in the Dark Ages on a subject.
> >
> > Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
> > bottom airfoil?
>
> Seems to me it is symmetrical.
>
> > Do ya think a HP Goldcup .61 would work in the Tigre II .40 ?
> > Tuned pipe also.
>
> It would be wild to say the least, but then why build a T2? It is a
> nice plane for decent aerobatics with really good wing loading. If you
> don't want these characteristics then don't build a plane like this. If
> you want raw, stupid power to weight then look up the Ballistic (sp).
> Somebody here sells it.... is built around the YS91.
>
> >
> > Got to have a lttle extra power :-)
>
> A ST .51 on a pipe would be all that was needed.
>
> Robert
--
Paul McIntosh
Desert Sky Model Aviation
"Fast delivery, FASTER engines"
http://www.icatmall.com/desertsky
http://www.dancris.com/~warbird
pjb...@my-dejanews.com
"Larry" <aer...@snip.net> wrote:
> Hello , I am in the Dark Ages on a subject.
>
> Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
> bottom airfoil?
>
> also.
>
>
> 3716
>
> "Most RC Guys are great- except for one" E-Mail me -God made good people
> overlooked these guys.
>
>
The Tiger II airfoil is symmetrical. A .61 might have prop clearance problems
on the II. The .60 (I have both) is at least as good a plane as the II. Mine
uses the K&B twist-head .61, which does a satisfactory job.
Both mine are tail-draggers... Don't like the stalky trike gear on a
low-wing. With the gear wire blocks installed just in -front- of the spar,
and tilted forward so the front of the tire is visible from directly
overhead, they go down the runway like they're on rails. No steering inputs
needed.
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lu...@nauticom.net
"Larry" <aer...@snip.net> wrote:
> Hello , I am in the Dark Ages on a subject.
>
> Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
> bottom airfoil?
>
> Do ya think a HP Goldcup .61 would work in the Tigre II .40 ? Tuned pipe
> also.
>
> Got to have a lttle extra power :-)
>
> OR would the .60 size just be nifty Thanks aer...@snip.net Larry AMA
> 3716
>
semi semetrical
.60 / .61, whatever it takes. I run a .52 4S
flies nice
Ed Chait
>
>I'm pretty sure the Tiger 2 airfoil is fully semetrical.
>
>In the process of building a T2 powered by an OS
>70 FS. In a month or so, I will be able to tell you
>of the outcome.
>
>Larry wrote:
>
>> Hello , I am in the Dark Ages on a subject.
>>
>> Does the Goldberg Tigre II have a semi-semetrical airoil , or is it flat
>> bottom airfoil?
>>
>> Do ya think a HP Goldcup .61 would work in the Tigre II .40 ? Tuned pipe
>> also.
>>
>> Got to have a lttle extra power :-)
>>
>> OR would the .60 size just be nifty Thanks aer...@snip.net Larry AMA
>> 3716
>>
>> "Most RC Guys are great- except for one" E-Mail me -God made good people
>> overlooked these guys.
>
The tiger 2 has a flat bottom sirfoil.
Andy
Ed Chait
>>
>The tiger 2 has a flat bottom sirfoil.
>
>
>
>Andy
Andy
RBarkus
it would be stupid in the Tiger2 and that that power to weight would be
better suited in a plane like the Ballistick. Which by the way sounds
like a plane that might interest me in the future!! I originally bought
my YS 91 for a Goldberg 300 but might be leaning toward a Webra 1.2
instead. We'll see.
Robert