Possible Carbon blades?

[northcarolinadan]

what do you guys think they will fit the Gaui 200?
227mm long

http://www.mscompositusa.com/cfc-main-blades-227-cm42.html

[Mr. Slumber]

Or try these

http://flying-hobby.com/catalog/product_info.php?cPath=3_5_9&products_id=1526

[scarr]

Or try these

http://flying-hobby.com/catalog/product_info.php?cPath=3_5_9&products_id=1526

Those blades are for the 100, much shorter than what the 200 has....

[Mr. Slumber]

Interesting... how much shorter to be exact?

[scarr]

They measure 150mm from the hole to the tip, the ones for the 100 that is....

[surgicalCFe]

what do you guys think they will fit the Gaui 200?
227mm long

http://www.mscompositusa.com/cfc-main-blades-227-cm42.html

The stock plastic blades are about 200mm long so these would be close. Not exactly sure what the extra length would do. Increased drag, motor would have to work harder, more lift, might be worth a shot. How long are the flying hobby blades?

[R.Lim]

an extra of 27 mm length of the main blade implicate that the tail boom has to be lengthened accordingly, if not , you will have a conflict with the tail blade. Beside, extra lengthe will not give extra drag at all. Shorter blade will give more lifting power.

[northcarolinadan]

i put a ruler to it, i think 15mm might be doable without a blade/tr strike but 27mm is just too much..

[surgicalCFe]

an extra of 27 mm length of the main blade implicate that the tail boom has to be lengthened accordingly, if not , you will have a conflict with the tail blade. Beside, extra lengthe will not give extra drag at all. Shorter blade will give more lifting power.

How is that possible? With more surface area it has to be generating more drag. Same with lift. Seriously if you have something technical that I could read on that I would love to.

[CompuFoil]

Longer blades will up the power requirements of the motor. To get the same lift, your main blades can spin slower, but that also means that your tail will be going slower, and less able to counter act the extra torque brought on by the longer blades. There is a lot of interplay going on.
Eric

[Gr4yb3ard]

Think of it this way:

There are two types of drag.

1. parasitic drag, caused by air turbulence around things that don't contribute to lift.
2. induced drag, caused by an airfoil doing work. (the price of lift)

The extra 15-27mm will give you lots more (apparent, or not designed for) parasitic drag, right at the tips, just where you don't need it, so the motor works harder, even at 0 pitch.

Pitch up and you get an increase in induced drag. As this is occuring at the tips, difference in total induced drag is huge.

Think <leverage> of the drag induced at the tips. Yes, there will be more lift, but you'r motor better be up to it! ... and esc, and battery, and servos.....

No, not to warn you off! We need to find blade sources, and this whole thing is about experimenting and having fun. But you're likely to be chasing this one for quite a while.

Looks to me like we'll be having a blade crisis, so I'm looking at ways to cut down stock 225's down to 200.

Woodies might work, but most of these are monocoted, maybe make a template and saw them off, the dump 'em in a jar of epoxy paint?

Are CF blades hollow? (...yeah, well, err, I have'nt risked cf blades on my stuff yet) If not, they could be cut and the tip re-epoxied.

I think I'll chase this for a while, get back to you....

Gr4yb3ard
" This squirrel is in agreement with the previous squirrel..."

[northcarolinadan]

i suppose a Trex 450 has more motor power to swing the 335's compaired to a 325 or a 315 set. I suppose when i was thinking a bit longer blades for the guai might have the same effect. I was quite suprised that the little 200 is quite stable as it is... sure is a kick to fly !!