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Other › Hubdave Frame just came in
02-08-2006 06:02 PM  12 years agoPost 141
lineofsight

rrApprentice

St. Louis, MO - USA

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Dave?
Has anybody heard from hubdave lately? I hope getting replacement parts doesn't take quite as long as getting the frame in the first place. I'm sure he's swamped with orders as his frames become more popular but this growing customer base doesn't bode well for the speedy individual attention he's been known for.

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02-09-2006 02:18 AM  12 years agoPost 142
rcmarty

rrVeteran

Penticton , B.C. CANADA

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which parts did you guys break ? I have some of the blue carbon sheet.
I could make a few parts if needed.

MArtin

What goes up will come down.... one way or another !

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02-09-2006 05:28 PM  12 years agoPost 143
hikscub

rrApprentice

California

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I need some spare parts and I've sent Dave 5 emails with no response.

Dave is a good guy, he's working really hard, and his frames are great. But I have to say getting spares is a real problem.

I think when Dave comes up for air he'll help us out but for now I'm going to need some carbon fiber stock.

Anyone know where I can get silver carbon stock like Dave uses?

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02-12-2006 09:08 AM  12 years agoPost 144
smoothound

rrVeteran

Lancing, West Sussex, UK.

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I've cracked on with my build


I've been suffering from really bad glitching which appears to be from the tail belt, this is something I've not seen in any of my other Rexes at all.

Did anyone else have problems of this kind?

Phil

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02-13-2006 07:52 AM  12 years agoPost 145
smoothound

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Lancing, West Sussex, UK.

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Sorry to hear that

Not surprising we've not heard much recently then.

Best regards to you and your wife Dave if you are watching.

Phil

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02-23-2006 09:30 AM  12 years agoPost 146
Daniel Wee

rrVeteran

Singapore

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I think Dave's back but give him some time to sort things out.

Meanwhile, I've been testing a 45T pulley for the tail. This new style pulley is hollowed out and is about 5g lighter than the solid block pulleys and I like it very much. Because of this, my AUW is down to 736g with the 3S TP2100 Prolites.

Today (and the past few days) I was flying with the new configuration and I must say I like it very much. The lower tooth count means that the diameter of the pulley is a bit smaller (compared to the original 48T) and so there is more clearance between the side frame and the pulley. With the 48T, there was minimal clearance.

This also means that the tail is running more slowly than before - with a 4.09:1 ratio compared to 4.36:1 for the 48T and 4.95:1 for the standard Align gearing (4.24:1 for the blue gears). In practice the tail holds well both in forward and backward flight, as well as in rolls and flips. It is also noticeably quieter and the overall feel is that it's smoother. I really like this combo (tail is driven with a HDS-877 servo for the moment).

Previously the Heliup bird was my favourite, but this Hubdave bird is really growing on me - yielding better performance and control than I had expected. The one thing that is a small issue is the asymmetrical cyclic pitches, due to the way I have the servo horns set up - they're slightly raised at neutral stick. I did this to get more play on either side but may have to re-work this in the future. For the moment though, it is not affecting me all that much.

Daniel Wee

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02-23-2006 11:22 AM  12 years agoPost 147
smoothound

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Lancing, West Sussex, UK.

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I've currently shelved mine, just too much glitching

Phil

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02-23-2006 11:31 AM  12 years agoPost 148
Daniel Wee

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Singapore

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I've not had any glitches with mine so far, fortunately. I am in the tropics though, where the level of humidity is very high (70%-90% RH) and static doesn't build up easily. Have you ascertained the cause of your glitches? In my case, it was so good that I removed the ferrite choke to save some weight. No problems thus far.

Daniel Wee

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02-23-2006 01:15 PM  12 years agoPost 149
smoothound

rrVeteran

Lancing, West Sussex, UK.

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It's certainly belt generated, if I disconnect the tail it stops. If I spray the belt with anti static spray it goes away but only for a short time.

I need to ground the belt to the frame and on to the -ve of the battery but as I have no problem with my others so I'm thinking it must be the frames fault in some way but haven't had time to look into it. It's probably the belt guide bearings etc I've already fiddled with them so they actually rotate properly which they didn't at first but thats as far as I've gone.

Phil

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02-23-2006 04:36 PM  12 years agoPost 150
Terry1229

rrApprentice

North Idaho

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static
It would be interesting if you could put some ceramic bearings in the tail drive and see if that helps....

There are probably a few off us would like to know the results..

Thanks: Terry

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02-23-2006 04:40 PM  12 years agoPost 151
Daniel Wee

rrVeteran

Singapore

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The other thing that might be worth trying is using a CNC tail pulley such as those made my MicroHeli, Duzi or even the new SE types. That way you have less plastic spinning and rubbing, acting like a Van de Graff generator.

I'm assuming you're currently using a standard plastic tail shaft pulley?

Daniel

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02-23-2006 04:47 PM  12 years agoPost 152
smoothound

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Lancing, West Sussex, UK.

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Yes I do still have a plastic pulley inside the tail case and the big ally one up front.

Having thought about this a bit more, am I wrong in assuming that my belt is already grounded to the main frame via the 4 bearings, screws and plates that guide the tail belt?

Phil

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02-23-2006 05:22 PM  12 years agoPost 153
Orion_V

rrVeteran

Cliffside Park, NJ

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smoothound what receiver are you using?

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02-23-2006 05:34 PM  12 years agoPost 154
Daniel Wee

rrVeteran

Singapore

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The outside of the belt is, smoothbound. But because the polyester is a good insulator, it is still very possible that the inside of the belt which comes into contact with the tail-side pulley is still generating static. Maybe you should look at the bearings and/or the metal pulley solution. That might help.

Daniel Wee

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02-23-2006 05:57 PM  12 years agoPost 155
smoothound

rrVeteran

Lancing, West Sussex, UK.

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Schulze 835 but I've tried a JR R770 and it does the same, major deflections of all the servos

Phil

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02-23-2006 08:28 PM  12 years agoPost 156
Orion_V

rrVeteran

Cliffside Park, NJ

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smoothound have you tried different servos? Which ones are you using? I had a few that would glitch on me, swapped them out and they were fine. Sometimes a faulty servo will twitch under load. You can test this by applying a small amount with your finger while the servo is at neutral. If it starts going crazy you know it's malfunctioning. Just soemthing else to try.

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02-24-2006 10:06 AM  12 years agoPost 157
smoothound

rrVeteran

Lancing, West Sussex, UK.

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HS56's at the moment. I've checked the servos and they are all ok. As I said it only seems to happen when the drive to the tail is connected so it's certainly the belt causing it

Phil

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02-24-2006 01:48 PM  12 years agoPost 158
smoothound

rrVeteran

Lancing, West Sussex, UK.

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Well I've just solved one problem I was having I hope and that is the tail kick even when it didn't glitch.


Both main bearings that were included in the frame are notchy and I mean really notchy

Phil

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02-24-2006 03:15 PM  12 years agoPost 159
Orion_V

rrVeteran

Cliffside Park, NJ

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Smoothound,

Replace the main bearings at once if they are notchy, I've read of others with "notchy" main bearings and once they swapped them out they got rid of the glitches. You also may want to look into getting a rx with DSP like the Bergs. I use them in all my helis and don't get any glitching (used to have this problem a lot before using the Bergs). Of course you will only be masking the glitches, but at least you will be able to fly w/o them, which will save you time hunting them down, and save your sanity as well

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02-25-2006 09:33 AM  12 years agoPost 160
smoothound

rrVeteran

Lancing, West Sussex, UK.

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I will be replacing the bearings, I'm hoping the new ones arrive today if they don't I may try the standard Align main shaft bearings but they are 1mm deeper so I'm going to lose 2mm of shaft. I don't think it will be a problem though.

Having spoken to a friend he is of the opinion that the bearings on the main shaft on this frame really could do with being bigger all over because of the added side load on the main shaft because of the tail being driven directly from there...

I thought the Schulze Rx's used similar technology to Berg's although I'm not sure on that? To be fair a Berg would still have glitched I'm sure because we fitted a PCM Rx(R770S) and even that was going nuts

Phil

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