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Old Jan 21, 2013, 11:16 AM
D.English is offline
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Hey VooDoo, whens the big move? Cant wait to see the speeder you and Yuri come up with...
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Old Jan 21, 2013, 11:28 AM
Jwmflying14 is offline
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Whoa.... VooDoo, when, where, and why are you moving?

And are you really selling that swist?
Old Jan 21, 2013, 11:48 AM
Flyextreme is offline
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Sure it'll work
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Quote:
Originally Posted by blitzu View Post
Thats 45mm bck frm the Le....but that 45mm in,is measured halfway alng the wing..

Its measured halfway alng the wing,because on most general wing shapes halfway is the average chord lenght...
Old Jan 21, 2013, 01:06 PM
VooDoo Child is offline
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Drinks Day Old Expired Milk
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Originally Posted by D.English View Post
Hey VooDoo, whens the big move? Cant wait to see the speeder you and Yuri come up with...
I am heading there Friday for a few days for my b-day...and pick up my new boat The big move will be March 1st or 15th.....But that will take over a week as we are heading to VA Beach and NY NY to see family,then heading to Vegas for a few days...then up to Portland.....Yuri will only be 4 miles from my house
Old Jan 21, 2013, 01:09 PM
VooDoo Child is offline
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Drinks Day Old Expired Milk
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Originally Posted by Jwmflying14 View Post
Whoa.... VooDoo, when, where, and why are you moving?

And are you really selling that swist?
I am selling the Swist so I can get into the West Coast racing screen ...I am moving to Portland for the same reason any man moves 3500 miles from what he knows- Chasing Skirt
Old Jan 21, 2013, 04:04 PM
vespa is offline
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First pull up, then pull down
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FYI the textbook method for describing c.g. location is in % of the mean aero chord, taken *at* the mean aero chord. This chord is not simple by any means, and though it is located somewhere spanwise outward, it's almost always an imaginary chord line that is partially off the wing, sometimes even completely off the wing, and usually a different length than the nearby chord. See pic for an example. It is extremely difficult to calculate this and only necessary for aero design so the hobby convention is completely different and in no way similar, compatible or meaningful. In the hobby we simply measure the chord at the fuselage intersection and take a percentage of that (a completely worthless number) or we simply measure from the leading edge along the fuselage.

Screenshot below taken from Montag's excellent c.g. calc.
Old Jan 21, 2013, 04:12 PM
jackosmeister is offline
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DroneWorlds - TEAM NEW ZEALAND
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^ This +1
Old Jan 21, 2013, 07:11 PM
johnnyrocco123 is online now
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You down with EPP?
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I am guessing with a 5mm motor shaft, I am not going to have a spinner on my Swist.
Old Jan 21, 2013, 08:37 PM
VooDoo Child is offline
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Originally Posted by johnnyrocco123 View Post
I am guessing with a 5mm motor shaft, I am not going to have a spinner on my Swist.
Did you call Esprit or Atlanta Hobby...thought they had a few that will work....you can use a folder spinner without the yoke.....But do not hold me to it,i am in the garage with the music kicking,sipping Framboise while working on the boat : )
Last edited by VooDoo Child; Jan 21, 2013 at 08:45 PM.
Old Jan 21, 2013, 09:04 PM
johnnyrocco123 is online now
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You down with EPP?
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Originally Posted by VooDoo Child View Post
Sure,just use a folder .....Or get a Graupner.
Graupner doesn't make a 30mm for a 5mm shaft.


I am looking into a different motor though.

Mega 16/40/1.5S (1915kv)

Should be available in 3.2mm shaft.
Old Jan 22, 2013, 01:04 AM
Arcteryxxx is offline
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Livin it UP when Im goin DOWN
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Quote:
Originally Posted by johnnyrocco123 View Post
Graupner doesn't make a 30mm for a 5mm shaft.


I am looking into a different motor though.

Mega 16/40/1.5S (1915kv)

Should be available in 3.2mm shaft.
AeroNaut does: http://www.electricwingman.com/product.aspx?product=810
Just skip the middle piece and put the prop straight on. Works like a charm.
Old Jan 22, 2013, 02:57 AM
BulletMaster is offline
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Chillaxin dude!
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Arctery,
We tried those spinners at 33K RPM + and they deformed to the point of imbalance (on a Reverb/wasp/mibo).

RFM does a CF spinner, but it's a folder type. Means the blade choice is more restricted.
Old Jan 22, 2013, 03:54 AM
blitzu is offline
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The Prop is Where its At!
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CG.....Nice,learn't sumthing new today...
Yea my last 2 planes have been custom jobs,and with swept wings etc the builder always balanced them halfway along...as the last wing shape (avatar) was quite a complicated wing shape..but he was the designer/builder so knew w he was doing.
Will def balance swist by fuse thou
Old Jan 22, 2013, 03:59 AM
blitzu is offline
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The Prop is Where its At!
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[QUOTE=BulletMaster;23889752]Arctery,
We tried those spinners at 33K RPM + and they deformed to the point of imbalance.


Bro i was thinking about going with a aeronaut folding spinner..would they handle 28k rpm ish no worries?
cheers
Old Jan 22, 2013, 04:46 AM
la528it is offline
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Quote:
Originally Posted by vespa View Post
FYI the textbook method for describing c.g. location is in % of the mean aero chord, taken *at* the mean aero chord. This chord is not simple by any means, and though it is located somewhere spanwise outward, it's almost always an imaginary chord line that is partially off the wing, sometimes even completely off the wing, and usually a different length than the nearby chord. See pic for an example. It is extremely difficult to calculate this and only necessary for aero design so the hobby convention is completely different and in no way similar, compatible or meaningful. In the hobby we simply measure the chord at the fuselage intersection and take a percentage of that (a completely worthless number) or we simply measure from the leading edge along the fuselage.

Screenshot below taken from Montag's excellent c.g. calc.
I second Jeremy's statements. When I measure at the intersection of the fuse, my Reynolds numbers are off by a factor of around 1.6180!!!!


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