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Home✈️Aircraft🚁HelicopterBlades and Night Flying › New TST Extreme V-Blades
08-04-2007 09:48 PM  13 years ago
Eco8gator

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Palm Beach, FL

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Hello

Other than the texture was anything else changed like the airfoil?

C
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08-05-2007 12:07 AM  13 years ago
misskimo

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Alaska 17 years, before mississippi for 31y

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hey , the airfoil is changed ,
also like to add, the test I been doing isnt up to snuff, had a motor grounding out , 3 motors wires was rubbing the top case, that would explain the shorter flight times I was getting on the 3 flights I did, Im supprized it didnt blow the motor, I noticed this when I was trying to install a new canopy and it wouldnt fit, it really pressed the 3 wires into the motor case.
its all fixed now , ready for some action , YEH!
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08-08-2007 06:16 PM  13 years ago
kookboy

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Vancouver, BC

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its all fixed now , ready for some action , YEH!
Report !
... But honey it was only $$$
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08-12-2007 03:11 AM  13 years ago
Louisiana Helicam

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West Monroe, LA

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Where can I buy them other than the Vblades website?www.louisianahelicam.com
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08-16-2007 02:35 AM  13 years ago
DOperchal

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Ft Rucker, AL

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Getting back to the compressibility of the airflow around the blades. Although the airflow around the airfoil of the blade increases in velocity, it is nowhere near supersonic speeds. You don't even start to see local sonic airflow until the airfoil is around .8 Mach. The popping" sound is created by the same effect that allows one to hear the propeller noise of small GA aircraft.

Also although full scale aircraft do not have dimples per se, many do have turbulizing strips on the wing. This has relatively the same effect of dimples by de-laminating the boundary layer and delaying the separation of the airfoil.

Peace through superior firepower
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08-16-2007 03:02 AM  13 years ago
inkspot1967

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Cranston Ri

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i got to try these at ircha and love them. i think the tst's auto better then my radix i had which i sold after trying these.

lots of pop and bite. love them
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08-16-2007 04:38 AM  13 years ago
reiserrob2003

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Brockton, MA.

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I was told by an experienced RC heli pilot who has tried these blades that he noticed better pop when pumping collective but for sustained climbouts they actually bog more than regular blades. which makes perfect sense to me because once you loose that boundary layer that textured surface becomes less aerodynamic.
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08-16-2007 05:23 AM  13 years ago
reiserrob2003

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Brockton, MA.

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also, I forget what those things are called on that picture of the jet, but I do know that there primary function is not to increase the boundary layer but to straighten airflow and reduce turbulence. Also, I did some further research. And it reads "with low drag shapes, skin friction (laminar flow) becomes a major component of drag at high speeds." it goes on to say "boundary layers grow consistantly thicker from front to rear. To a small extent, the rate at which the boundary layer thickens depends on the roughness of the surface. textures that are shallower than the thickness of the boundary layer have a negligible effect. As a result there is a certain minimum size of these bumps that can be toleratedwithout without appreciably increasing skin friction. This minimum size, however, depends on the thickness of the boundary layer at any given point, so smoothness is in general more critical toward the front of a streamlined shape than toward the rear"
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08-16-2007 10:00 PM  13 years ago
Danny Calderone

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South Jersey

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💎Sustaining Member
The new TST's are the juice. Much less yank on the motor, all the V-blade lovin, "Fart". I'm a lifer.Signature
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08-16-2007 10:14 PM  13 years ago
DOperchal

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Ft Rucker, AL

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Those strips are called vortex generators (at least that was the best picture of them that i could get from google. If that aircraft has a different use for them then whoops.) The purpose of a vortex generator is to re-energize the boundary layer by introducing turbulent air (ie de-laminate). Vortex generators are especially helpful at high angles of attack because the turbulent boundary layer will delay the separation of the airflow, which in turn allows you to have more performance. They work the same principle as the leading edge strakes on the F-16.Peace through superior firepower
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08-18-2007 02:56 AM  13 years ago
reiserrob2003

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Brockton, MA.

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those aren't vortex generators. If you look at a F-15 there are small fins right above the aft fuselage missile mount, those are vortex generators. And their purpose is to create a vortex to push the missile away from the fuselage, if it didn't have them the missile would strike the aircraft after jetison.
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08-18-2007 02:58 AM  13 years ago
reiserrob2003

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Brockton, MA.

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actually, they might be vortex generators. I could have sworn they were called something else though
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08-18-2007 03:06 AM  13 years ago
reiserrob2003

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Brockton, MA.

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i apologize, they are vortex generators and that as a picture of Gloster Javelin. I work on F-15s and like I stated earlier they also have vortex generators but for the purpose of pushing the aft fuselage missiles away from the aircraft. I know some of the passenger aircraft also have them.
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08-18-2007 04:05 AM  13 years ago
reiserrob2003

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Brockton, MA.

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I just bought a pair of the old style Vblades today. I've been wanting to try them for a while and I figured I better get them before they're all gone.
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08-21-2007 06:29 PM  13 years ago
shawgl

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Murrieta, CA

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Cost
I'm not sure if anyone has thought of this but for all you composite guys out there. Porous release film. It is a cloth like layer that is layed over a composit while in a mold or when being repaired. It is designed to absorb excess resin and provide a textured surface that doesn't require sanding before painting. I don't know what their lay up procedures were before but that (porous release film) is what they are using now. I use the same stuff every day at work. I wouldn't doubt if it's saving some $$ during manufacture. I'm not sure what they were doing prior so I'm not sure.
In God we trust, everyone else we monitor.
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08-21-2007 08:00 PM  13 years ago
Bert Kammerer

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Orlando, Florida

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I wouldn't doubt if it's saving some $$ during manufacture
Just curious, how are they saving money?
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08-21-2007 09:05 PM  13 years ago
Dave Yost

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San Diego Ca, USA

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It is called Peal-Ply. It is used during lay ups on composite components to provided a textured surface to bond things to after the part is dry. It also will absorb some resin, but that is not its primary purpose. They make some other stuff that they call "perf" for short, it is plastic sheet with micro holes in it, the vacuum sucks the resin through the holes and traps it on top. Peal-ply does make for a more consistent lay up, but that is positive by-product, and not the primary purpose.

I think they are putting peal-ply in the mould, so it would be costing them a little more money in materials. However, it is much easier to get a more consistent peal ply finish, then smooth finish with no pin holes. So, what they spend in peal ply, they get back in the form of less rejected parts, not to mention sales.

Pretty smart if you ask me.

I bought 600's and 690's at IRCHA. Can wait to fly them this week end.

Dave
MA Fury Extreme,Vibe 50, JR 9303,YS,Vblades, Don't blame me, I voted for Jimmy Buffet!
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08-21-2007 09:17 PM  13 years ago
Dave Yost

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San Diego Ca, USA

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FIY, in the Jet picture above, those are vortex generators, NOT boundary layer control. Note that they are located in front of the Aileron. Vortex generators are designed to make vortex in front of a control surface, so that at high AoA, and during critical mach number the control surface is more affective. Boundary layer control are much smaller bumps, and will in crease the wings efficiency, Vortex generators are much larger, and will increase the Airframes total parasite drag coefficient. This is why you don't see vortex generators much any more on new generation airplanes.

Dave
MA Fury Extreme,Vibe 50, JR 9303,YS,Vblades, Don't blame me, I voted for Jimmy Buffet!
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08-21-2007 09:19 PM  13 years ago
shawgl

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Murrieta, CA

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I quoute... Porous release film, Slang is peel ply. straight from the manufacturer description. Referance NA01-1A-21, Abaris composites. And it's purpose is exactly that... A more repeatable lay up. No excess resin pooled up at the edges. It pulls the excess on top of it and when it is removed it peels that hardened excess right away with it.In God we trust, everyone else we monitor.
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08-21-2007 09:30 PM  13 years ago
Dave Yost

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San Diego Ca, USA

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Humm....at General Atomics(Predator UAV Manufacturing) they use both peal ply and Perf in all Vacuum bagging operations. The Spec out lines peal ply for a textured bounding surface, and pref to trap resin. Different applications I guess.....Same result.

Cheers Dave
MA Fury Extreme,Vibe 50, JR 9303,YS,Vblades, Don't blame me, I voted for Jimmy Buffet!
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