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Blade 400 › 3D Better/Harder main shaft
07-07-2008 03:50 PM  9 years agoPost 1
BlakeMcBrayer

rrElite Veteran

Georgetown, Ky

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I have bent three stock main shafts in flight. I do mean in flight, I have not crashed it yet and zero hard landings. I fly my 400 at home since it's not safe to fly my nitro 90's there.

So does anybody make a better shaft? This replacing shafts every week is getting old.

Don't come off the throttle untill you see your GOD!

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07-07-2008 11:35 PM  9 years agoPost 2
IFHELI

rrApprentice

Woonsocket,RI

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I feel your pain. I had the same problem and no one believed me. Through my search to fix this problem, I found that the mini titan mainshaft could be made to work. All you had to do is drill a hole in it where you bolt the main gear to shaft. The only problem is if you tranfer the hole to match the e-flite shaft then the MT shaft just reached the top of lower bearing. But if you drill it about 1-2 mm +/- higher, then it will reach into the bearing and adjust the linkages in the head and servos.

I am now useing a custom made shaft, but will use the MT if a crash and can not get my custom shafts made in time.

Keith

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07-22-2008 07:36 PM  9 years agoPost 3
luckygopatrick

rrNovice

Phoenix, AZ - USA

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main shaft problem

I am in Iraq and was wondering where and how you had them custom made? Also I have noticed the same problem with bent main shafts even out of the package and on first run up with no head installed. Just wondering and any help would be great.

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07-22-2008 11:49 PM  9 years agoPost 4
IFHELI

rrApprentice

Woonsocket,RI

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I used drill rod and had a friend cut,drill, and grind the flat spot. Then since they were full 5mm OD, I took them down to roughly 4.98mm. You can get precision ground drill rod already at the correct OD. The e-flite shafts i have checked run about 4.96-4.97mm

You can also just buy mini titan mainshafts and have hole drilled so you can bolt the e-flite gears/one-way to shaft. Just line the top holes up in both shafts and transfer location for lower bolt hole. Then move it up about 1 to 1.5mm(+/-) from mark and drill hole. I do this mostly by eye. The mini titan mainshafts are shorter than e-flites so you have to raise the hole up alittle higher on mini titan shaft to allow the mainshaft to reach into lower bearing. Then just adjust linkages to make up for lowering shaft. Also depending on where the flat spot falls you may have to grind a slightly longer flat spot. The two mini titan shafts I am useing now, I did not have to adjust flat spot.

Forgot to add that they are solid also on drill rod and MT mainshafts.

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07-23-2008 06:20 AM  9 years agoPost 5
butters149

rrApprentice

monterey park, ca

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that sounds like alot of trouble. I cant beleive these shafts bend jst from regular flying. How do you know if they are bent without taking them out?

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07-23-2008 08:10 PM  9 years agoPost 6
luckygopatrick

rrNovice

Phoenix, AZ - USA

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When you take the brand new shaft out of the package and install it on your heli and run it up at low speeds you will see a wobble from the shaft and the more you build up on the head with out blades the better you can see how off the machining is on those parts. I had one on my heli that was close as could be and after a few flights it has bent itself back to get a wobble during run up. I am in the process of getting some new ones machined from a solid stock of steel or aluminum and will let you know how that goes once I test those. Unless someone is going to mass produce a better main shaft then its up to us to make out own.

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07-24-2008 02:36 AM  9 years agoPost 7
vortechZ230

rrElite Veteran

U.S.A.

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Check MicroHeli, they might have a hardened main shaft available...

Blue skies, Light Winds!

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08-01-2008 07:24 AM  9 years agoPost 8
accidental3d

rrNovice

willow springs,il

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read an article, do not remember where, u can use a trex 450 main shaft and grind a little bit off and it will fit.

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08-01-2008 07:26 AM  9 years agoPost 9
accidental3d

rrNovice

willow springs,il

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grind it to shorten it. i believe off the top

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08-04-2008 04:54 PM  9 years agoPost 10
supra6

rrApprentice

Singapore

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U mean Micro Helli, highly overrated.

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08-05-2008 12:05 AM  9 years agoPost 11
zaw

rrKey Veteran

Lebanon, NH - USA

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I had mine bent from an emergency landing. I didn't even crash it but it hit the ground on the landing gears pretty hard and some how end up with bent main shaft.

ಠ_ಠ HBK2 built with inexpensive parts! ٩๏̯͡๏)۶ Gaui425

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08-05-2008 05:22 AM  9 years agoPost 12
nappyroots2182

rrElite Veteran

Moline, il

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my quick check is to stick the shaft in my drill press and run it to check for wobble. easier then sticking it in the heli. yes most of my new main shafts come bent. i have 3 new ones that are bent just sitting around

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Blade 400 › 3D Better/Harder main shaft
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