FB blades on FBL

[milly0812]

Sorry if this has been done before but I couldn't find it so here goes.


Can you use fb blades on fbl and vice versa with no ill effects ????
i know it make little difference on my 450 but what about larger ? Does it really make a discernible difference to flight characteristics ?

[Si_B]

I don't think it makes much difference. Some of the stick banging blades don't work too well because their weight is not concentrated the right place to make a good flybsrless blade. I think fbl blades on a fb machine would just dampen things down a bit, but it would all still work.

[heathy]

FB blades on a fbl will speed up the cyclic.

[waveydavey]

My interpretation is if the blades have been produced with anything but neutrality then they will fight the fbl system. In saying that though I loved the feel of fb stick bangers on the BeastX, very progressive, but I've since found I love Spins and the grabbing nature of them

[Tim Procter]

FBL blades are normally a few grams more in weight so as quoted above FB blades are quicker on Cyclics.

Obviously the heavier blade will auto better too which is always good.

[tourerjim]

+1 to the above two posts, using fbl blades on say a fb 450/500 size heli could be an advantaged to someone just starting out but would need to lower cyclic to 8 degrees

[Planehazza]

My experience is there is no difference whatsoever, but I'm no 3D god.

[milly0812]

Thanks for the replies, I have decided to get some fb edge and try them myself. If a faster cyclic is the worst side effect then happy days :-)

[rudi]

This is just a theory, but a lighter FB blade on a FBL DFC head may cause additional feathering shaft slop at the same headspeed and perhaps additional wear as a result. I come to this theory because DFC designs need higher headspeeds and hard dampers to keep everything rigid, and a lighter blade produces less lateral load at the same headspeed.

[milly0812]

I would have thought a lighter load would mean less stress on the dampers ??

[rudi]

Yes, my theory is less loading on the dampers and thrust bearings means they will not be as rigid which means more feathering shaft slop which means more wear and tear on the DFC links and swashplate.

[Planehazza]

I can't see there being much difference in load between FBL and FB blades of same brand and size? Unless there's a more considerable weight difference than I thought.

EDIT: Taken from the EDGE website, the FB 603mm are ~126g, and the FBL 603mm are ~135, so "around" a 9g or 7% increase in weight. At 2200RPM, I can't see that making too much difference on load? I'm no engineer though!

[rudi]

Difference on Align 325D blades is 10g per set.

I found this website calculator for centrifugal force: CalcTool: Centrifugal force calculator

5g on a 325mm blade spinning at 2500 rpm has a centrifugal force of 11.4kg.

[Martind]

I had Spin 620fb on my fusion then put some Gyrphon 615 on and cant tell the difference, but then i'm no expert

[Paulice]

I can't see there being much difference in load between FBL and FB blades of same brand and size? Unless there's a more considerable weight difference than I thought.

EDIT: Taken from the EDGE website, the FB 603mm are ~126g, and the FBL 603mm are ~135, so "around" a 9g or 7% increase in weight. At 2200RPM, I can't see that making too much difference on load? I'm no engineer though!

only 40kg's more force