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Old Sep 02, 2012, 09:37 PM
geo68
Joined Aug 2012
66 Posts
Quote:
Originally Posted by OldOz View Post
Geo - well, your names were similar! (fixed)
This purports to come from MJX itself: price is for two, but picture clearly shows Chinese box.
http://www.aliexpress.com/product-fm...olesalers.html
Agree others have said F45 is better, but mine are F645. OK ....so far! (300+ flights).
Luck!
John
PS - depends on what the servo is connected to?!
Ur full of poop
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Old Sep 02, 2012, 09:45 PM
geo68
Joined Aug 2012
66 Posts
Slayer reigns and china sucks. MY f45 is grounded
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Old Sep 02, 2012, 10:51 PM
John
Australia, QLD, Brisbane
Joined Aug 2012
542 Posts
Ty!
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Old Sep 03, 2012, 03:44 AM
Registered User
The Netherlands, ZH, Rotterdam
Joined Aug 2012
66 Posts
Tail motors hard to find :-(

Hi Guys

My tail motor gave up after only 30 flights or so, one brush is completely gone, the other seems ok.

Three weeks ago I ordered a few tail motors from Banggood, ut today I received an email from them that they are out of stock, does anyone know where to find those motors, most stores are of of stock or very expensive.
Is there a more easy to find replacement motor maybe from another RC heli.

Cheers.
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Old Sep 03, 2012, 04:00 AM
John
Australia, QLD, Brisbane
Joined Aug 2012
542 Posts
A final word on the brushed 370 motor.
Having been sent a 370 with a faulty pinion, I thought it might be interesting to establish a MTBF based on a bit more than guesswork.
So the motor was setup running from a workshop power supply set to 7.6V, through a (555 with decade countdown) timer set to 5min on/10 min off. The simulated load (a paintstirrer in a bucket of water!) was set to load the motor to 7amps. Cooling from an adapted PC fan - ensuring the motor case was kept below 75 degrees C.
The motor failed at a little over 8h actual runtime. (I thought it would be more). When dismantled, the brushes had almost completely worn away, though the actual failure was from a collapsed brush support arm.
Of course, motors might vary. But it would seem to put a definite limit on the number of flights before motor replacement for those of us likely to stay with the F45: and an added inducement (if one was needed!) to go BL.

Cheers to all
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Old Sep 03, 2012, 04:03 AM
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Geso's Avatar
Spain, Valencian Community, Burriana
Joined Mar 2012
119 Posts
Thank you, the accident was against a signal of traffic, had plenty of wind and I could not stop it, modify the servo feed with long arm and between that and the new lipo is making very good progress...
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Old Sep 03, 2012, 04:04 AM
John
Australia, QLD, Brisbane
Joined Aug 2012
542 Posts
Flyor -
Just got 4 tail motors from Top Star (through AliExpress). & 7day delivery, through DHL
http://www.aliexpress.com/store/prod...566349751.html
Hope this helps?

Geso -
NOW I understand. Again, tough luck, hope you're flying again soon!
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Last edited by OldOz; Sep 03, 2012 at 04:12 AM.
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Old Sep 03, 2012, 04:12 AM
Hangin' for a strong SW
slothy89's Avatar
Australia, VIC, Wendouree
Joined Apr 2012
724 Posts
AliExpress.com seems to be the best source for F45 parts, and the heli itself. BangGood is just too unreliable if the order requires any more thought than "I want that one".

AliExpress merchants are forced to provide good service as the Alibaba company hold the payment from the seller until the buyer gives the OK. Saving most occurrences of poor customer service. Banggood are their own company, so if they don't provide good service it doesn't matter as they have the money already.
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Old Sep 03, 2012, 04:34 AM
Registered User
Joined Aug 2012
65 Posts
Quote:
Originally Posted by slothy89 View Post
Can the Flybar move freely? and is it balanced?

If the flybar is stiff, it can cause the heli to get stuck flying in one direction. I have experienced this problem on my small SoloPro 260a (100 size).

Especially since you mentioned the dogbone links were coming off, I have a feeling something is restricting the flybars movement. Whether its the pivot pin, or one of the ball links is stiff. Check all the moving parts of the head and make sure they move freely.

It is also possible one of the dogbone links is TOO loose, and falls off mid flight and causes the crash. So also check they don't pop off too easily

Thanks a lot for the hints !

The flybar moves very nicely in all directions. However, what I did see was that the dog bones are attached in a somewhat awkward angle. Theoretically I would expect them to be mounted in a 90 degree angle but they are somehow tilted. They don't come off easily, it rather requires quite a bit of force to remove them from the flybar.

Another thing is: I never had them coming off before, even from hard crashes. And now when they come off, the always come off the flybar, not the counter part. Well, I have to check the flybar again I guess ...

Thanks a lot
Frank
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Old Sep 03, 2012, 05:06 AM
Registered User
The Netherlands, ZH, Rotterdam
Joined Aug 2012
66 Posts
Quote:
Originally Posted by OldOz View Post
Flyor -
Just got 4 tail motors from Top Star (through AliExpress). & 7day delivery, through DHL
http://www.aliexpress.com/store/prod...566349751.html
Hope this helps?

Geso -
NOW I understand. Again, tough luck, hope you're flying again soon!
US $35.32 including shipping, ouch!, I'm in the Netherlands, and don't have a creditcard (like most out here) so I have to use PayPal to pay for stuff that limits the usable internet stores for me.
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Old Sep 03, 2012, 06:04 AM
Eugene
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Australia, VIC, Delacombe
Joined Oct 2006
918 Posts
Quote:
Originally Posted by Flyor View Post
US $35.32 including shipping, ouch!, I'm in the Netherlands, and don't have a creditcard (like most out here) so I have to use PayPal to pay for stuff that limits the usable internet stores for me.
Hi Flyor, You can also do direct deposit into their bank account just ask them for the details.
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Old Sep 03, 2012, 08:03 AM
Registered User
United States, CA, Modesto
Joined Aug 2012
828 Posts
Quote:
Originally Posted by Frank183 View Post
Thanks a lot for the hints !

The flybar moves very nicely in all directions. However, what I did see was that the dog bones are attached in a somewhat awkward angle. Theoretically I would expect them to be mounted in a 90 degree angle but they are somehow tilted. They don't come off easily, it rather requires quite a bit of force to remove them from the flybar.

Another thing is: I never had them coming off before, even from hard crashes. And now when they come off, the always come off the flybar, not the counter part. Well, I have to check the flybar again I guess ...

Thanks a lot
Frank
Make sure that you have the dogbone attached to the long side of the rocker arm and not the short side.
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Old Sep 03, 2012, 08:44 AM
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Joined Aug 2012
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Quote:
Originally Posted by arrowshooter View Post
Make sure that you have the dogbone attached to the long side of the rocker arm and not the short side.
Errm ... could you maybe explain that more in detail ?

Ahem ...

Thanks a lot !
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Old Sep 03, 2012, 08:53 AM
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War Horse's Avatar
United States, FL, Hernando
Joined Sep 2012
1,460 Posts
Hi all, just got done reading all 190 posts, it took a week on and off. I ordered the F45 from aliexpress due to the high praises in here.... and also joined the forum.

Now I already had a DH9117 coming, hoping these are better than previous DH stuff. I was ready to push the button on a Funcopter V2, but the price was a WOW instead chose the F45.

I crashed my B450 yesterday, again, so I was down to the 9101 today to get my fix, what a POS it is to fly.

I hope not to drive y'all crazy, BTW, I'm 55 and not as quick as I used to be.
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Old Sep 03, 2012, 09:13 AM
Hangin' for a strong SW
slothy89's Avatar
Australia, VIC, Wendouree
Joined Apr 2012
724 Posts
Quote:
Originally Posted by War Horse View Post
Hi all, just got done reading all 190 posts, it took a week on and off. I ordered the F45 from aliexpress due to the high praises in here.... and also joined the forum.

Now I already had a DH9117 coming, hoping these are better than previous DH stuff. I was ready to push the button on a Funcopter V2, but the price was a WOW instead chose the F45.

I crashed my B450 yesterday, again, so I was down to the 9101 today to get my fix, what a POS it is to fly.

I hope not to drive y'all crazy, BTW, I'm 55 and not as quick as I used to be.
Welcome WarHorse! You will find the F45 a pleasant change from the DH craft. Many here own both and seem to agree that MJX is a much tougher, more stable bird, and is more fun to fly.

Also the age factor is not a problem here as quite a few of the main members of the F45 team are closer to your age than you think


Quote:
Originally Posted by Frank183 View Post
Errm ... could you maybe explain that more in detail ?

Ahem ...

Thanks a lot !
There is a link between the swashplate dogbone, and the flybar dogbone called the "Mixer Arm". This should be oriented so that the swash connects to the shorter end, and the flybar to the longer end.

This orientation is what gives the heli its stability without dampening the movement too much. If you were to reverse both mixer arms, the heli would be extremely docile and barely have any movement authority (as I found out on my solo pro accidentally) and it also will put your trims way off.

The attached photo shows the correct orientation of these links.
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