Hornet Build questions

[MicroHeli-Nut]

This might sound like a dumb ass questions for some of U guys with the hive, but i need help:

1) Tail drive bearings..... -> how do i space them out? Equally or non-equally?

[HZM]

if you are toking abt the bearings in tail boom...... aceviper did mentioned add in another 1 or 2 ...... u may have better result. I did them equally.....don know any advantage by doing non equally.......


Cool


Mike

[MicroHeli-Nut]

Glued them with unequal distance.


~update: I glued them with a needle and put two spots of Ca beside the bearings with the bearing in the middle...the CA seeped into the internal diameter[not in the bearing]!!!! Is it okay?

[spidey]

hi ray

my flying skills are so poor tat i had the opportunity to build the tail drive a few times ...

here's wat i think...

... ya u definitely need more than one bearing in the centre of the boom for a smoother tail drive...2 equally (or approximately)spaced out one seems to be jus nice...

alternatively u can have 3 bearings (one being in the centre)...but will be a tad heavier (negligible if tail servo is not attached to the tail fin)...

as long as the bearings can move freely, it shld be ok...as for me... i dun glue the bearings...i use heat shrink tubing to secure the bearings to the respective positions...jus so i can salvage them after a boom strike...

also... i have come to notice tat some of the carbon rods are not really "ram-rod" straight (due to the way they are stored, the temperature they have been exposed to...or it may be jus me)...the ones from MS are, plus the diameter seems to be jus nice but they are very ex...

then there's the tail rotor pitch slider...ensure that the pitch slider can slide about as freely as possible...and i mean really SLIDE...think its one of the main culprit for creating the famous hornet wag...but it seems that none of the guys here have suffered from that...jus look at david's h2

hope it helps...enjoy

[MicroHeli-Nut]

Callin' Spidey ,

The pre-assembled hub on the tail shaft is rough just at where the shaft matts the hub, was trying to smooth it out with my sandpaper, turns out the sand paper was too rough and there are now scratch marks on the shaft. Slider's not smooth......by my standards i think.....

Also, the flanged bearing at the tail end does not fit in all the way. -> I had trouble fitting it.... I left it sitting with the flange away from the edge of the boom by 1.5mm- 2 mm. Is it okay? I was thinking that the tail gear box could hold that in place.

[Tele]

no you need it flush with the edge ...if you leave a gap then when the tail is under high load the pinion slips at the main gear causing it to strip! ....the bearing should be flush at both ends and the pinions fitted without a gap between them and the bearing. if not then ..stripped pinions

I learnt the hard way
any play in the shaft can cause a warp in the drive shaft and ends up splittng the shaft too another bad thing

cheers doug

[spidey]

hi ray

...think the scratches shldnt pose much of a problem...jus make sure u apply a thin layer of teflon/lithium grease such that the pitch slider can move about freely...

as for the tail flanged bearing...doug said it all ...rightfully the MS tail drive shaft shld be just nice in length such that they flush with the top of the pinions when pressed in...slight protrusion is fine though...

[MicroHeli-Nut]

Thanks Doug, Spidey.

Saved the bearings!


I'm gonna use Spidey's method of heat-shrinking, bearings are expansive.

tail-shaft-> I've got finner sand paper will try and see if i can polish the metal..... Spidey, is lithium grease available at Ace DIY?

[blueprints]

Where do u guys ure Hornet parts from? Are these parts compatible with the various hornet models such as Hornet CP-X, HOrnet II etc. thanx

[HZM]

Hornet parts can be purchased locally from Hobby Shack at Fookhai. Else oversea online store is the next alternative. MOst parts should be interchangeable except some.


Mike

[blueprints]

Thanz HZM!

[MicroHeli-Nut]

This is what i meant when i couldn't get my tail gears to mesh and matt 100%

[MicroHeli-Nut]

Pic

[MicroHeli-Nut]

Also i've flailed [ no pic, the shaft just becomes 'mushroomed']one end of the drive shaft cos i'd to hammer in the tail gear.

I shaved off the bulk and start to press in the conical gear[ the one connecting to the main gear] Bits of carbon come out. But everything fits on tightly...... WAnna ask if it's okay.

Managed to keep the bearings at their allocated positions with heat shrink tubing.

[Tele]

sand it off and put a drop of CA on it and sand it again to get it smooth ..the CA should hold the CF fibres in place.

Cheers doug