RE: Hirobo XRB PICS!!! and build info.  
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    • All Forums >> RC Helicopters >> Electric RC Helis >> RE: Hirobo XRB PICS!!! and build info.
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    RE: Hirobo XRB PICS!!! and build info. - 3/2/2005 8:20 AM   
    turboBB


     

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    Status: offline     		OK guys bear with me with me here. I discovered something rather peculiar and that is that my XRB flies better with repaired blades than brand new ones (no I'm not trying to be funny here). Get this... every time I crack the foam blades, I just grab the CA and glue the pieces back together (99% of the times, it's right near the base). Then after the CA dries, I add tape over the crack for additional support. Then I rebalance and track and voila, it's soooooooooooo smooth!

    Now, I have a theory that perhaps the additional stablization is due to the blades being just slightly stiffer at the base (and thus reducing the coning effect) and also maybe the additional weight at the base of the blades act as additional stabilizer weights?

    Dunno, but I can try to see if I can grab a video to prove this. Meanwhile, I have 4 sets of repaired blades waiting to be used.

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    RE: Hirobo XRB PICS!!! and build info. - 3/2/2005 5:06 PM   
    bdavison


     

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    Status: offline     		The XRB will rotate better tail to right(counterclockwise), vs tail to left.(clockwise) Not sure why, but I think its due to torque on the main head. Its just the nature of the beast. From what I understand is that regular helis do this too. When rotating against the direction of the rotor head, it rotates faster because its "torque spinning". Against the torque its slower. Ive been trying to figure out a way to counteract this too.

    As far as it doing it on its own...nine times out of ten, its because the motors are getting hot. When they get warm, it makes it more difficult for them to maintain a matching RPM.

    Best thing to do is let it cool off, and then fly again. Ive also found that setting it down, and turning it off, and then turning it back on, will reset the gyro. I think sometimes its possible to confuse it a little.


    __________________________________________________________

    Haven't tried the housefly blades, but Ive been thinking about that too. I dont know if they will fit or not. Ive heard that the holes are larger in the housefly blades, which would make them difficult to position on the head properly.

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    turboBB...

    Id agree here. The less coning the blades do, the better it flies. The cone acts like dihedral in a plane. It makes it want to level out all the time.
    When you make the blades stiffer, so they dont cone as much. It loses some of its leveling stability...but this is a good thing...it makes it MUCH more maneuverable, and faster

    Thats also one of the reasons I wanted the carbon blades. Ive heard they are much stiffer, and wont flex upward so much.

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    RE: Hirobo XRB PICS!!! and build info. - 3/2/2005 5:51 PM   
    turboBB


     

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    Status: offline     		I've ordered the Carbon Blades for a friend's b'day. Will post back with performance once he gets it and is able to test it.
    As mine has been flying pretty well with the banged up blades, I'm just going to stick with em for a while.

    Let me know how yours fly with it when you get them.

    Thx!

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    RE: Hirobo XRB PICS!!! and build info. - 3/2/2005 5:59 PM   
    bdavison


     

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    Status: offline     		I will definatly let you guys know about the carbon fiber blades when i get them. They should be here in a few days.

    Ill be sure to post pics and exactly what(if anything) I had to do to make them work.

    Im really curious to see about durability of them.

    I think they will look awesome, as carbon fiber is cool to begin with, but they also told me that they have a real high gloss finish to them too.

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    RE: Hirobo XRB PICS!!! and build info. - 3/2/2005 10:09 PM   
    Donnie7



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    Status: offline     		bdavison,
    I wonder it you can tell if the carbon blades are tracking right. The foam blades are one reason I think the XRB flies so well. Its so easy to tell if they are tracking right. I guess you will find out soon.
    Donnie

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    RE: Hirobo XRB PICS!!! and build info. - 3/2/2005 10:54 PM   
    bdavison


     

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    Status: offline     		I cant see any reason why they would be any harder to track properly. They are black so it should be easier to see against a light background like the sky or a wall. The white foam blades are hard to see against the sky or on white walls and such.

    Ive gone so far as to fly it infront of a matte black sheet hanging from the wall, so I could see EXACTLY what it was doing and then recording high speed video of it, so I could watch the blades go around slowly. Pretty cool.

    Here's how it works.
    To move the tail counterclockwise, it speeds up the lower rotors RPM's. To move the tail clockwise, it slows down the lower rotor. This is why I think it turns better counterclockwise vs clockwise.

    When it turns counterclockwise, its using torque from the lower rotor head to spin the heli. Since the torque is applied close to the main body, it goes fast.

    When it turns clockwise, its using the torque of the upper rotor to spin it. Since this torque is applied from a rotor that has some distance between it and the main body, it is applied more slowly.

    This is my theory anyhow. Based on what Im seeing from the high-speed camera, this is what it looks like.

    Whats really cool is seeing how the flybar collective works. You can actually see each blade change pitch as it moves around. Its really cool. In forward flight(forward cyclic) you can see the advancing blade change to zero pitch, and the retreating blade change to full pitch.

    This is why that 45 degree flybar angle is so critical. If you had the flybar at 90 degrees, when the heli pitches, it would make it start changing pitch earlier in its rotation. This would result in more lift on one side of the heli...which could potentially flip it over, as there would be no cyclic on the bottom rotor to counteract it.

    The thing Im now curious about now, is how would changing the flybar angle on a regular FP heli affect its flight? It seems to me like moving the flybar from the standard 90 to 45 would soften the pitch responses...Question of the day is:
    Would this make it easier to fly, or just more sluggish?

    Hmmm...might have to try it when I get a new heli.

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    RE: Hirobo XRB PICS!!! and build info. - 3/4/2005 8:19 PM   
    bschumacker


     

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    Status: offline     		Does anyone know where I can get my hands on a copy of the XRB user manual? Maybe even a PDF version? My Sky Robo is on backorder and I want to start the learning process. I have never flown an RC helicopter before, so I am anxious to start getting familiar with how one of these work.

    Thanks,
    Brian

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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 12:54 AM   
    bdavison


     

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    Status: offline     		I dont know of any online manuals. I think you'll have a very hard time getting one. Hirobo viciously protects their copyrights, so I dont think anyone would take the risk to put one up.

    I know you want to get a head start, but unfortunatly, I think you will probably have to wait. You will need the heli for most of the stuff in the manual.



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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 2:16 AM   
    flyehelis


     

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    Status: offline     		Don't worry too much about getting a head start. The XRB practically flies itself. The main learning curve with it involves minor adustments in pitch, etc to get it perfect. That stuff only makes sense when you have the copter in hand.

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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 3:38 AM   
    Donnie7



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    Status: offline     		bdavison
    I got that 4" batterycable today so I don't have to remove the canopy to charge the battery anymore. A great improvement. Call me lazy but its only time befor the canopy starts to crack from taking it on and off. I highly recomend it.
    Donnie

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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 3:41 AM   
    OAM


     

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    Status: offline     		Just wanted to say that I'm a noob and today I jsut got my xrb. I've never flown a RC copter or plane before but I have had Real flight for a few months now. All I can say is that the XRB is easier to fly than the helis in real flight. I do have a question though. I want to get an extra battery for the XRB but i'm not too sure what to get? Do i have to buy a Hirobo battery or is there a generic one out there? Also can anyone reccomend a charger that can charge nicads, nimh, and the xrb lipo battery? esp. one thats not too expensive and that charges faster than the stock one.

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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 4:37 AM   
    bdavison


     

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    Status: offline     		Yeah, I need to order one of those cables.

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    OAM,

    You will need the battery specifically made for the Hirobo, unless you get an adapter cable that you can plug regular lipo's into.
    Go back to page 1 or 2 of this thread. There is a link for Ricky. He has the adapter cables available.

    As far as a charger. If you get the adapter cable to use regular lipo's, there are quite a few chargers out there. I highly recommend the Triton charger from Great Planes. Its a bit pricey, but you will never need another charger.
    It will charge NiCd, NiMH, PB(lead acid), Li-Ion, and LiPo batteries. In addition to charging just about any kind of battery out there, it is also the most comprehensive charger Ive seen. It has an LCD panel that will display EXACTLY what is going on with the battery while charging, and also tells you other information.

    Bear in mind that you wont be able to charge the battery faster. The stock charger that comes with the helicopter is already set to charge the battery at max rate. LiPo's cannot be fast charged. If you overcharge them, they WILL explode.

    The XRB is designed to be easy to fly. Its a beginners helicopter. More than likely the Real Flight ones you were flying were full house CP heli's. They are much harder to fly. If you've gotten pretty good with Real Flight, you're probably already whipping the XRB around the house. Have fun!

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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 5:08 AM   
    OAM


     

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    Status: offline     		bdavison, thanks for the help. ok so i ordered the cable that allows you to use jst plug batteries from Ricky. So with this can i use any 7.4v battery does it matter what mha it is? waht aobut cells? does that matter and also discharge rate. I see some batteries with a 5c rate and some with 8c, what the difference? Sorry about all the noob questions, I'm pretty new to this stuff.

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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 2:43 PM   
    bdavison


     

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    Status: offline     		You can use any 7.4v 2 cell LiPo. Dont use a 3Cell 11.1v LiPo, it will burn it up.
    I would recommend staying around 750mah or less. As this will keep the weight down.
    The OEM battery is a 7.4v 720mah battery.
    The 5C/8C thing is referring to how much current can be drawn from the battery without damage.

    Example:
    1C = 1 times the capacity of the battery. So 1C of a 750mah battery would be .75amps
    If you had a 750mah battery it would be as follows

    750 mah x 5(for a 5C discharge rate) = 3.75 amp max draw.
    750 mah x 8(for a 8C discharge rate) = 6 amp max draw.

    Some LiPo's will have the discharge rate listed in amps. It will say something simular to "10 amp discharge" etc.

    Higher discharge rate is better. It will allow the heli to consume as much as it needs without starving for power, or toasting the battery by trying to pull too many amps. Electronics are funny things, they will always try to draw the amps they need to operate. You dont have to worry about amperage destroying the heli, its the voltage that can do harm.

    Amperage is how many electrons are flowing, Voltage is how fast they are being pushed.




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    RE: Hirobo XRB PICS!!! and build info. - 3/5/2005 5:09 PM   
    OAM


     

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    Status: offline     		Another question about batteries, I've seen some batteries with two connectors coming out of it like this one http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=38287&item=5960100797 what the difference? and can i charge this battery with the stock XRB one? Also will it fit in the stock battery holder?

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    RE: Hirobo XRB PICS!!! and build info. - 3/6/2005 7:59 AM   
    OAM


     

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    Status: offline     		in the XRB manual it says trim is not to used for rudder adjustment. Does this mean not to trim the rudder with the trim slider on the radio? Should I only trim by adjusting the pitch, or can I use the trim on the radio to do it if its not that off? Also in the part where it talks about taking the heavier weights off and putting the lighter one on it also talks about moving the adjustment rod onto the shorter ball end. if i want to make the XRB a little more responsive can i just use the lighter weights or do i have to also move the ball rod, can I jsut do one at a time or will that make something off balance. Also if someone could also answer my earlier post about the battery I would greatly appreciate it. sorry for such noob questions. thanks

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    RE: Hirobo XRB PICS!!! and build info. - 3/6/2005 7:23 PM   
    turboBB


     

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    Status: offline     		I believe the manual was referring to the gyro sensitivity, in which case, yes it's best to leave that one alone. If the XRB is continually spinning in one direction you should adjust that by making sure your blades are tracking fine. In some cases where one blade's base is weaker than the other, you will never get it to look perfectly level. Do the best you can with the tracking and then you can adjust the rest via the Tx's trim.

    To be honest, I've flown mine with the blades approx. 1/4" apart since I keep flying with repaired blades and the thing is just still so smooooooth without a hint of vibration or wobble.

    As for the stabilizers yes, you can do one thing at a time to see what kind of effect it has. I've not tried it yet so can't give you any feedback about the performance.

    Not too sure about the batteries, I'll defer that to more knowledgeable members on this forum.

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    RE: Hirobo XRB PICS!!! and build info. - 3/6/2005 9:24 PM   
    bdavison


     

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    Status: offline     		The gyro adjustment for rudder is not to set right or left trim. It is to adjust the gain on the rudder.
    Rough rudder trim should be made by adjusting pitch on the top rotor head. Fine adjustments can be made via the trim levers on the transmitter. If you have to move the trim on the tx more than 4-5 clicks, you should adjust the top rotor head. You should not need more than 1-3 clicks of trim on the Tx to maintain stability.

    As far as the battery with two sets of wires.

    One wire is for attaching the battery to the helicopter.
    The other wire is for charging.

    In multiple celled LiPo batteries, it is best if the cells are balanced.
    This means that both cells are charged so that the voltage and capacity matches in both cells. With the cells balanced it will run longer, and last longer. The purpose for the seperate cable is to allow you to charge one cell at a time. Most likely it has a chip or something inside the battery pack that splits the incoming voltage and amperage so that it charges each cell individually to keep them balanced.

    The TANIC battery packs actually have three connections. One for connecting to the heli, and (2) one for charging each cell of the battery.

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    RE: Hirobo XRB PICS!!! and build info. - 4/3/2005 3:18 PM   
    bschumacker


     

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    Status: offline     		If anyone is looking for a like new Hirobo XRB SR with a bunch of extras I have one for sale in the RCU classifieds

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    RE: Hirobo XRB PICS!!! and build info. - 4/6/2005 7:38 PM   
    CostaRica1


     

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    Status: offline     		Anyone knows if the XRB can lift an ounce ? I'm planning to attach a multipod device...

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    RE: Hirobo XRB PICS!!! and build info. - 4/15/2005 6:34 AM   
    jaardesign



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    Status: offline     		I ordered my xrb on monday and it came today. the battery charged in 15 minutes though :? But I was flying it for about 8 minutes before i crashed and broke a blade. The worse part is that there was no spares in the box. Needless to say I'm having blades sent overnight, and another battery. I guess the important thing is....this thing is dope! the blades just kept spinning faster and faster and i had no idea if they were supposed to be loose like they are so i kept my distance. but then it started sliding around on the floor so i was able to learn the controls without taking it off the ground. i was also able to trim the radio a little so it wouldnt move around by its self. once i did that i flew it for the first time and was able to hover hands free for about 3-5 seconds. Im so used to driving my rutler its going to take awhile to get used to the controls. I cant imagin trying to do any of those tricks people do or even fly a regular r/c helicopter. anyway i have a couple questions.

    1) i didnt install the "skid braces" or anything else. should i?
    2) can this lift a 9v battery?

    thanks!


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    RE: Hirobo XRB PICS!!! and build info. - 4/15/2005 7:11 AM   
    Donnie7



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    Status: offline     		jaard,
    Look again for the extra blades, they are hidden. I don't remember where but they are probably there.
    I installed the skid braces. Don't know if they do anything?
    Havn't tried to lift a 9v battery? let us know?
    Donnie

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    RE: Hirobo XRB PICS!!! and build info. - 4/15/2005 11:27 AM   
    VinceHerman



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    Status: offline     		I was worried that mine came without spare blades for a while. Then I found them. In a seperate little box on the opposite side from the bigger spare parts box, on the other side of the transmitter.

    Can it list a 9v battery? Give it a try and let us know. I want to make a hook for ours and try to pick up army men like I did as a kid with the Verti-bird. Or are you asking if you can run the XRB on a higher voltage pack? I would not recommend that you try that.

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    RE: Hirobo XRB PICS!!! and build info. - 4/15/2005 10:27 PM   
    bdavison


     

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    Status: offline     		It should lift a 9V. I had three GI-Joes hanging off of mine hovering in the house.

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    RE: Hirobo XRB PICS!!! and build info. - 4/15/2005 10:46 PM   
    cmh284



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    Status: offline     		Spare blades are in the box - My hobby shop tells everyone where to find the blades because so many people were coming back saying they didn't get any spares. THEY ARE IN ONE OF THE BOXES inside the large box.

    My local hobby shop just got a shipment of about 30 of these. I bought one on Wednesday. They are so awesome!

    He is selling them for $299.00. I am not sure if he would ship them out or not, but I can check if anyone is interested.

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