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03-30-2005 02:43 PM  13 years agoPost 21
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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Hey Jamie - The blade length could be a problem as you have stated. A stretch 3D Pro is the next step with a lengthened tailboom and T/R drive shaft. And yes I was somewhat surprised with the head speed with the L.A.Heli plastics. Went without the SBEC as an experiment. So far so good. All components are only warm at the end of the flying session (ESC, batteries and motor).

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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03-31-2005 10:23 AM  13 years agoPost 22
wilsonj

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Waikerie, South Australia

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Hiya Boyd,

Just found the perfect replacement for the boom if you are interested. JR vigor torque tubes are 8mm outer 7mm inner.

Keep us informed on the 4S esc setup. I have an Sbec sitting here now anyway. Pity its bigger than the esc!

Regards
Jamie Wilson

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03-31-2005 12:59 PM  13 years agoPost 23
Hoverup

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Golden Gulf Coast - USA

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Thanks for the tip Jamie.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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04-01-2005 03:10 AM  13 years agoPost 24
wilsonj

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Waikerie, South Australia

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Well I don't have a tail on my machine yet, but I thought i would get the 4S setup with the axi all ready to go.

I am using a 17t pinion, as this is all I have on hand. I feel it is a little big,. but should give me an idea of power.

I connected my watt meter and started up. One thing I noticed was that the freshly charged 4s 740 pack was sitting on about 16.5v!! So I spooled up, holding the model with one hand. I tried to go full throttle but I wasn't convinced I could hold it safely. But according to the watt meter I was pulling 160w at about 3/4 stick!! Thats probably pushing the axi a little hard, but my god did it pull! And the pack never dropped below 16v

My tail parts are at the P.O. So hopefully I will get a chance this weekend to get some video. Provided nothing falls off. I might keep the throttle to about 80%, just so I don't overload the esc, motor or head. Should still have a headspeed just under 3000. Unfortunately I don't have an optical tach that goes high enough to check this.

Regards
Jamie Wilson

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04-01-2005 10:59 AM  13 years agoPost 25
rscamp

rrVeteran

Ontario, Canada

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Jamie.

Sounds good! Can't wait to see how you like it. As you say, 17T looks like it is a tad too big.

With regard to the optical tach, just halve the speed on it - you'll still be able to stop the blades and you can double the number you get.

I received the motor and battery the other day but I'm still waiting on pinions.

Rob

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04-02-2005 09:16 AM  13 years agoPost 26
zoom

rrElite Veteran

Galveston, Texas

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Man, I'm loving the info you guys are putting up, especially the on-going spirit of experimentation. You guys are charting new courses for the new Pro. That is what it is all about, "Options". That is how people found out about the 400DF. For those who are contemplating running the DF, they are offering a great deal on it. Heck, I paid retail for the DF in my video. I wish I would have waited but that's OK. I may have to scoop up another for a jet project.

Link to info for the DF:
http://rotorworks.net/viewtopic.php?p=7445#7445

rscamp,

As far as the constants on the motor contact: http://www.vinnie@justgofly.com
He surely knows the most about any of those MTM motors.

Jamie,

I have been pushing those Kokam 740s pretty hard in my Twin Jet with the 400F, and I have to say they have been hold up pretty well. They don't even get warm @ 17.1 amps, but then again I do fly in spurts on my Twin Jet. Here is the latest clip:

Video:
http://www.rotorworks.net/rotorwork... Vertical-1.wmv

In the CP Hummer, the 400DF gives me ~ 4.5-5min, but talk about fun.
I personally like the MTM line because of the decreased weight, nice power, and most importantly the price. Efficiency is for rich folks

Let us know how those other experiments are going.

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04-02-2005 10:52 AM  13 years agoPost 27
twinsticks

rrApprentice

South Jersey

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Would this work ( two ) 1320 3s paks put together with a y connector .
That would make the voltage 22.2 correct.
Using the stock brushless motor with a cc 10.
New to the high voltage game here.

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04-02-2005 02:26 PM  13 years agoPost 28
zoom

rrElite Veteran

Galveston, Texas

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That will not work.

The stock motor can only handle up 4 cells 14.4-16.8 volts. If you string 2 x 3s1320, you will end up with 6 cells which way too much voltage as well as a 180-190g pack, which is way too much weight.

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04-04-2005 11:19 PM  13 years agoPost 29
Hoverup

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Golden Gulf Coast - USA

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Stretch Century 3D Pro Rx

--------------------------------------------------------------------------------

Just put a few more flights on my stretched 4s High Voltage H'Bird Pro and it proves to be twice the heli I started out with.

Chassis: Century 3D Pro HummingBird
Motor: Model Motors AXI 2208/20
(with a 15t pinion from ECO 8 sources)
ESC: Castle Creations Phoenix 25 (No separate BEC ckt and so far no problems to report)
Batteries: PolyQuest 880mah 4s Liploy packs (repackaged as 4s with Deans Micro 2R connectors)
Optional ThunderPower 1320mah 4s Lipoly packs (longer duration, but decreased nimbleness)
Servos: 3 Hitec HS-55 servos on cyclic and a Hitec HS-50 on T/R (Ball links on all cyclic and T/R control rods with CF tube fabricated T/R push rod.)
Gyro: Futaba GY-401 HH
Receiver: Berg III DSP6
Tailboom: MaxIr aluminum (Part number Y0176 tail boom @ $13.30) with fabrcated 3mm CF T/R driveshaft Alternatively you can fabricate two tail booms from a JR aluminum tail drive shaft - part number JRP993004 that list for $14.95.
Main rotor Blades: MaxIr 280mm plastic(Part number - Y0666 @ $17.90) or MaxIr 280mm CF (Part number - Y1660 @ $42.40)
T/R Blades: Shogun
Fabrcated CF gyro and receiver/battery mounting platforms
Stainless steel main shafting is now available from Walt Ferar by special order.
Heat-gunned the LG struts and spread them to lose the bow-legged look. Still not happy with this or the Shogun canopy solution. More to come.


Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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04-04-2005 11:58 PM  13 years agoPost 30
twinsticks

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South Jersey

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Looks great boyd!!

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04-05-2005 01:52 AM  13 years agoPost 31
rscamp

rrVeteran

Ontario, Canada

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Yes, nice work!

Slight change of plans here. I received the pinions, but the one for the Hacker was bored too far off centre to be useable.

So, it is straight to the AXI. I just mounted it and spun it up. Governor mode was wierd but I think I read somewhere that this is normal. Can anyone confirm?

Rob

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04-05-2005 01:57 AM  13 years agoPost 32
Tmaster

rrKey Veteran

TX

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sweet!!! how much was the SS tube from walt?

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04-05-2005 02:10 AM  13 years agoPost 33
Hoverup

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Golden Gulf Coast - USA

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Tmaster - PM sent.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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04-05-2005 02:11 AM  13 years agoPost 34
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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Rob - gov mode with Phoenix ESC's does not work well with outrunner motors.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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04-05-2005 02:11 AM  13 years agoPost 35
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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twinsticks - Thanks for the good words Mate

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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04-05-2005 02:24 AM  13 years agoPost 36
rscamp

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Ontario, Canada

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Thanks for confirming the governor issue Boyd.

Rob

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04-05-2005 06:39 AM  13 years agoPost 37
wilsonj

rrApprentice

Waikerie, South Australia

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Hi Boyd,

I am just arranging some parts to do just what you have. We seem to be headed in the same direction!

I have the longer boom, and have some Zoom blades coming. 280mm long 31mm chord and 13g.

I am also going to try a set of carbon Trex tails that are 27mm chord and 55mm long, 4mm longer than stock. I am assuming the stock tail won't handle the extra torque of the longer blades.

Also with my CC10, occasionally it will stop when spooling up the axi. Once running its fine. Do you have any problems like this? Didn't matter if I was on 3S or 4S.

I tried on 3S. With either carbon blades or stock woodies and the performance was average. Good enough for 3D if you are very careful. Looks like 4S will be the way to go from what I have seen so far.

I knocked the tail on the ground this morning and broke the gearbox, so now I have to wait for parts, again! Grrr. Its a pain not getting parts locally. I'd even settle for country! hehe

Regards
Jamie Wilson

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04-05-2005 10:21 AM  13 years agoPost 38
wilsonj

rrApprentice

Waikerie, South Australia

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Incidentally I noticed you have your Rx mounted in the same place as I do. I originally had it mounted up front, but with the sbec also I thought it might pay to mount it as far away as possible. The bet paid off as I haven't had a single glitch recorded on my schulze Rx since!! Pretty happy with that, as in the past I have had up to 30+ glitches per flight!!

Should be a good tip for everyone.

Regards
Jamie Wilson

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04-07-2005 06:44 PM  13 years agoPost 39
Hoverup

rrElite Veteran

Golden Gulf Coast - USA

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Well time to add the SBEC. The Phoenix 25 shut down complaining today when I really pushed the setup for about 12 minutes. Easy auto into the soft clutches of an Azaela bush. No damage. Lucky. Off to the shop to add the SBEC. Frankly surprised it took so long to shut down.

Cheers - Boyd
AMA 80393
IRCHA 3355
LSF 853
Major USAF
Retired

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04-07-2005 08:25 PM  13 years agoPost 40
Tmaster

rrKey Veteran

TX

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how about a CC35? I'm looking to get a hotter motor now...

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