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RE: 50cc QB 260 build thread - 1/7/2007 3:18 AM   
mikec3d


 

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From: schertz, TX, USA
Status: offline 		I apologize about the mis print @ the stock versus CF LG. My readings were stock- 9oz, CF- 6.5oz, for a diff of 2.5oz ..... I used JR 8611A's all @ , Futaba 3150 on THR. Big tank, 2400mah, 4800 mah Fromeco w/ regs, ALL STOCK HARDWARE. You can deffinitly use lighter servos, batt's and reg's, smaller tank, plus all the other stuff I mentioned, plus remove some excess material from the airframe, I beleive it would be scary close to breaking the 15.00 mark... JMO.

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RE: 50cc QB 260 build thread - 1/10/2007 2:33 AM   
Grelker



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Status: offline 		Just a note, guys. If you purchase the GraphTech CF gear, you will not be able to reinstall the gear cover.

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RE: 50cc QB 260 build thread - 1/11/2007 6:19 PM   
SuddenSam


 

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From: ANN ARBOR, MI, USA
Status: offline 		I got the 50cc Extra 260 for Christmas and was really impressed with the quality of the plane. This is what I plan to use for hardware:

4 SWB 1.25” Half Arms for Elevators and Ailerons
1 Smart Fly 10 Channel Power Expander
1 Smart Fly Ignition Cutoff
3 Fromeco Peerless 2400 mah batteries
4 Hitec 5245s for Elevators and Ailerons – do these servos have enough torque at 6 volts for this plane?
1 Hitec 5955 for Rudder
Carbon fiber spinner, landing and tail gear

I have an Evolution 58GX2 which I had planned to use but I am not sure if this is a good choice. In order to mount the engine so the prop back plate is at the correct distance I have to enlarge the hole in the firewall to 3”. The actual mounting bolts are just a little outside of where the DA50 would mount but I am taking quite a bit of firewall away. The other thing is that the high and low needles for the carb end of right at where the card goes through the firewall so adjusting the needles will be problematic.

I don’t have the funds right now to purchase a DA50 and don’t think I will for the start of the flying season but I hate to chop up the firewall and find out the Evolution is more engine than the plane needs plus I fear there may be a balancing issue.

Any thoughts?

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RE: 50cc QB 260 build thread - 1/11/2007 7:29 PM   
sp2pilot


 

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Status: offline 		My QB 50cc 260 is powered with a BCMA G62 that is quite a bit more powerfull then the Evo or the DA 50 and the plane loves power.

You will ove this plane

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RE: 50cc QB 260 build thread - 1/11/2007 7:29 PM   
zope_pope



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Status: offline 		Hey man,

You'll love the plane, however, DO NOT USE the 5245's. They are mini servos and not only will they not fit into the stock locations, they don't have near the torque required. You want around 180 oz in on all surfaces. Let us know how she turns out. See ya.

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RE: 50cc QB 260 build thread - 1/11/2007 7:43 PM   
reyn3545



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Status: online 		A lot of folks (including me) have used the 5245's for the throttle, to minimize weight, and a lot of people (including me) have had problems with these servos. It seems that some of them fail very early in life (the first minute or so). If they don't fail then, they seem to work fine, but zope pope is right... don't use them on the control surfaces. They won't fit the mounts and they don't have enough torque.

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RE: 50cc QB 260 build thread - 1/11/2007 7:44 PM   
SuddenSam


 

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quote:

ORIGINAL: zope_pope

Hey man,

You'll love the plane, however, DO NOT USE the 5245's.


Missed type - the servos are actually 5645's but they are only rated at 168oz at 6volts so I guess I will need to go to the 5985s. I have 3 more 5955s that if I bought 1 more I could use but that seems like overkill.


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RE: 50cc QB 260 build thread - 1/11/2007 7:46 PM   
xed


 

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Status: offline 		The 5645s will be just fine for the Ailerons and Elevators if you aren't going to be doing any crazy walls or bledners and stuff like that..

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RE: 50cc QB 260 build thread - 1/11/2007 7:50 PM   
SuddenSam


 

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quote:

ORIGINAL: xed

The 5645s will be just fine for the Ailerons and Elevators if you aren't going to be doing any crazy walls or bledners and stuff like that..


I have a long way to go before I will feel comfortable enough to do those maneuvers on anything other than my simulator

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RE: 50cc QB 260 build thread - 1/11/2007 7:54 PM   
zope_pope



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Status: offline 		This airplane walls so nicely though. Really, walls are easy maneuvers with the right setup. I am using 5985's and loving it. Now if the snow would just melt....

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RE: 50cc QB 260 build thread - 1/16/2007 1:49 PM   
SuddenSam


 

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quote:

ORIGINAL: zope_pope

This airplane walls so nicely though. Really, walls are easy maneuvers with the right setup. I am using 5985's and loving it. Now if the snow would just melt....


I decided to go with 5985's and I ordered a DA-50 to power the plane. I didn't like the fact that I couldn't get to the high speed needle on the Evolution 58 when it was mounted to the firewall with the prop back plate at the correct distance from the firewall. I would have had to move the motor forward or backwards almost 1/2 inch to be able to get to both needles. Niether option was desirable.

I went with CF landing gear, wing and stab tubes, plus a CF spinner so the plane will come out on the light side and the extra power the 58 provides just wouldn't be necessary.

The motor and servos will be here on Thursday so I will be able to finish the plane this weekend although the forcast is for snow and temps in the teens so I don't think I will be doing the maiden anytime soon.

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RE: 50cc QB 260 build thread - 1/16/2007 2:34 PM   
bodywerks



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quote:

ORIGINAL: Grelker

Just a note, guys. If you purchase the GraphTech CF gear, you will not be able to reinstall the gear cover.

Not without modifying it, but you most definitely can reinstall it after modification.

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RE: 50cc QB 260 build thread - 1/16/2007 3:05 PM   
SuddenSam


 

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quote:

ORIGINAL: bodywerks


quote:

ORIGINAL: Grelker

Just a note, guys. If you purchase the GraphTech CF gear, you will not be able to reinstall the gear cover.

Not without modifying it, but you most definitely can reinstall it after modification.


I jsut took a block of scrap balsa that was just about the right thickness, drilled lightening holes in it, shimmied it, and convered it wih some of the spare covering provided. It only took me about 15 mintues to do and it looks good. I thought about modifying the one that came with the plane but it looked like it would take me a lot longer to modify than to build a new one.

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RE: 50cc QB 260 build thread - 1/17/2007 7:19 PM   
M64



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Status: offline 		Hey guys

Is the rudder servo a 5kg servo? does the antenna run through the fuse?

M64

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RE: 50cc QB 260 build thread - 1/18/2007 12:32 AM   
zope_pope



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Status: offline 		24kg cm torque on the rudder servo. The antenna does run through the fuse, but not easily. I spent 2 hours with baby powder and my antenna trying to get that through.

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RE: 50cc QB 260 build thread - 1/18/2007 2:29 PM   
M64



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From: Cape Town, SOUTH AFRICA
Status: offline 		Does the plane come with the holes in the fire wall and on top of the box thing?
How do you put the 2 tanks in? in otherwords where does the smoke tank go?

Thanks

M64

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RE: 50cc QB 260 build thread - 1/18/2007 3:11 PM   
sp2pilot


 

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Status: offline 		Both tanks mount in the same tray just on their sides I Imagine with both tanks full the CG is going to be very nose heavy at take off.

I just did a minor re-kit on my Extra and decided to mount my fuel tank under the wing tube centered below the ballance point. That way the CG will always be nuetral regardless of fuel load. I don't run cans or a tuned pipe so the tunnel was not in use.

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RE: 50cc QB 260 build thread - 1/18/2007 6:47 PM   
M64



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Status: offline 		Sp2pilot can you post some pics of that setup so I can get a better idea of what it looks like?

Thanks

M64

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RE: 50cc QB 260 build thread - 1/30/2007 2:55 AM   
Grelker



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Status: offline 		Has anybody had to put downthrust into the plane? I checked yesterday with a 22x8 Xoar prop (10th flight) that I had the symptoms of not enough downthrust.

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RE: 50cc QB 260 build thread - 1/30/2007 3:46 AM   
zope_pope



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Status: offline 		Thats interesting. Mine acts like it has too much downthrust.... QC problem? Too much snow for me to start to fix it, but mine always seems to fly nose high.

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RE: 50cc QB 260 build thread - 1/30/2007 1:31 PM   
Grelker



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Status: offline 		That sounds like you need downthrust too. You can check be either flying along straight and level, then chop the throttle. If it needs downthrust, the plane will rise when it slows down. You'll know if it does, it's quite remarkable. That's the test I did and there was no question. Another check is to pull up vertical in front of you, watch which way the plane pulls as it slows down, if it pulls to the canopy, needs more downthrust.

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RE: 50cc QB 260 build thread - 1/30/2007 7:16 PM   
zope_pope



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Status: offline 		Well mine flies nose high to maintain level flight at all power settings. when the power is killed it will start to climb.

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RE: 50cc QB 260 build thread - 1/31/2007 12:40 AM   
Grelker



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Status: offline 		You need more downthrust too. I'm going to put in a little bit more and I'll let you know what works.

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RE: 50cc QB 260 build thread - 1/31/2007 1:54 AM   
SuddenSam


 

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Status: offline 		How far back from the prop backplate shoud the front of the cowl be? I have my DA-50 mounted with 2 1/2" standoffs and there is a 3/8" gap which seems like a lot.

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RE: 50cc QB 260 build thread - 1/31/2007 2:03 AM   
reyn3545



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Status: online 		Its really just a matter of taste.. won't have any effect on the plane... but you might think about moving the cowl out or going to 1/4 inch shorter standoff.

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