Electric RC Jets Discuss rc electric ducted fan or radio control prop jets here.

XB-70 EDF

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Old 04-16-2013, 08:51 AM
  #76
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Default RE: XB-70 EDF


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ORIGINAL: hadatom

Here are the settings on my XB-70:

The flight trim is 1/8 up on the right elevon and 3/32 up on the left elevon.

Full deflection for the both right and left elevon is 1 inch up, and 3/4 inch down.

This works on my plane and is not overly sensitive. You have to test it on your plane to find out what works best for you.

As I mentioned before, I do not use dual rates or exponential, but I mostly fly it straight and level, no loops, rolls and other aerobatics.
Thanks Hadatom!

I need to check mine but mine are close to yours except the left and the right are equal in throws.
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Old 05-23-2013, 07:09 PM
  #77
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Default RE: XB-70 EDF

I have elevator at full with 1/2 travel but I am puzzled by the Ailerons one side wants to go higher than the other unless this is the delta mixing of my DX6i radio.

I will shoot a video to show what I am seeing..



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Old 06-18-2013, 08:02 AM
  #78
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Default RE: XB-70 EDF


Quote:
ORIGINAL: Joe 1320

you can split the difference between the high amp draw of a 10 blade and the not so great sounding 5 blade fan by using the AEO 8 blade rotors. I get great sound with a moderate amp draw.

XB-70:
http://www.youtube.com/watch?v=di05t_BTQ_E

F-22:
http://www.youtube.com/watch?v=xB0E6MbWCUw

Is this with the stock motor and ESC?
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Old 06-20-2013, 06:42 PM
  #79
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Default RE: XB-70 EDF

I got to fly it tonight- OUTSTANDING JET!

flies very good...just wish the damn battery would last longer than 4 minutes!!! :-()
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Old 07-01-2013, 05:02 PM
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Default RE: XB-70 EDF

OK I am using the 2200mah 20c 14.8V battery.. using the stock setup... esc 45a

what battery can I upgrade too without changing the ESC?
2500mah 30c or 2300mah 30c or up to 45c?

Need help people!!!!!!!



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Old 07-02-2013, 04:07 AM
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Default RE: XB-70 EDF

Get the highest C value, but stay away from Nanotechs. You won't blow your 45 A ESC if you stay on 4 cell. If you are getting 4 minutes flights, be verythankful. I modified my ESC to a 60A and put in a 10 blade Change Sun fan, 5 cell batteryand new motor. Awesome performance, but got disoriented with sun at 200 ft altutute and crashed. It will fly again but not right away. Too bad, they don't seem to produce them anymore and they are available nowhere. One thing learnt about this crash, this big delta is no trainer and needs a LOT of altutude to recover from a dive. Do not fly it nose heavy (heavy battery) and avoid aerobatics from which you may not be able to recover.
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Old 07-02-2013, 04:17 AM
  #82
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Default RE: XB-70 EDF

I have done about 3 flights with her so far, I make sure the balance is near perfect for each flight- marked the battery location inside so the placement is perfect each time.

From the flights I have done I have noticed how easy it is the fly and the need to give a slight amount of up elevator until I adjusted the trim but overall I am pleased with the XB-70 and how well it flies and trust me I have have spent countless hours in the flight sim trying everything and the fact it flies like the one in the sim helps out!

Thanks for the Advice on the battery/esc..


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Old 07-15-2013, 06:36 PM
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Default RE: XB-70 EDF

The XB-70 which is my largest most powerful of my jets took off looking badass was about 1/8 mile away when the fan unit started to make some HORRIBLE noise..either I sucked in a humming bird or a very large BUG 200 feet up in the air.. the jet started SMOKING out the exhaust and I thought for sure she was on fire over of all things the freaking wheat field!!!!! I powered her off and pointed her towards the runway knowing there was no way to land her on her wheels so I elected to belly land her...well with now power on the fan she came down soft like a feather on the wind... I heard clapping and "GREAT SAVE AND LANDING DUDE!" so I checked the motor and the housing was melted...overheated..damn...but the XB-70 was unharmed!


So now it's time for a replacement motor/fan and ESC which I guess is shot now...

any suggestions?
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Old 07-16-2013, 09:52 AM
  #84
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Default RE: XB-70 EDF

I found the upgrade!!

Delta-V 15 69mm Electric Ducted Fan and Bl-15 motor 3600kv

this should get the air flowing!!!!
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Old 08-18-2013, 06:25 AM
  #85
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Default Where is the CG on the XB-70

I rebuilt my XB-70 after the crash but I can't find the instructions to locate the CG. Can someone tell me where it is ?
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Old 08-18-2013, 06:37 AM
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455mm or 17.9 inches :-) just flew mine this morning..love this jet!!!!!
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Old 08-18-2013, 10:12 AM
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Thanks ! I should get to fly it soon, this time with the 10 blade fan and 5 cell lipo. It'll be haulin' ass.
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Old 08-18-2013, 03:25 PM
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Cool - let me know how it turns out....
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Old 09-09-2013, 08:04 PM
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Quote:
Originally Posted by hadatom View Post
Yo, I will answer you soon. Did not have a chance to fly or look at forums since last fall. Completely reworked the Val, 5 cell battery, new motor, 60 C ESC and electric retracts. Will check throws for you and get back to you.
What electric retracts did you use...funny I never saw this post until now!!!
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Old 09-09-2013, 08:06 PM
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BTW I had a few flights since my upgrade on the XB-70- this thing now hauls compared to the old setup and it has plenty of power and speed!
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Old 09-17-2013, 08:34 AM
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Has anybody replaced the retracts on this jet?

I have seen the electric retracts but has anybody replaced them on this bird yet and if so what did you use?
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Old 10-07-2013, 12:17 PM
  #92
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Quote:
Originally Posted by Turbobearcat View Post
Has anybody replaced the retracts on this jet?

I have seen the electric retracts but has anybody replaced them on this bird yet and if so what did you use?
This is a Youtube video of my latest flight of the 70mm XB-70 with upgrades. I put a 10 blade Change Sun fan, a 6 cell Nanotech1300 mAh battery, HK 60A ESC, HK L2855-2300KV motor and HK electric retracts (with plastic trunions to save weight). I am also using an Eagletree flight stabilizer on 2D mode for smoother flights. The 1300 mAh may seem small but by staying away from afterburners except for a couple of passes and takeoff, it gives me more than 3 minutes of flight. Power to weight ratio is way more than 1:1. I could go for a larger battery, but I would have to add a lot of tail weight or reconfigure the battery compartment aft. I will be trying out the 12 blade Change Sun next week, with the same setup. The reviews on the 12 blade are awesome. Too bad NiceSky does not produce this plane anymore, the stock version was weak and underpowered, but with the upgrades it's haulin ass.

http://www.youtube.com/watch?v=gGyEv3aXmcA
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Old 10-07-2013, 02:10 PM
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Ok which ones from HK did you use - that is the lingering question that is buring a hole in my soul - could you post a link to the ones you used?
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Old 10-07-2013, 02:41 PM
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Quote:
Originally Posted by Turbobearcat View Post
Ok which ones from HK did you use - that is the lingering question that is buring a hole in my soul - could you post a link to the ones you used?
http://www.hobbyking.com/hobbyking/s...dProduct=17538
http://www.hobbyking.com/hobbyking/s...dProduct=28973

Use thinner wire for the struts, you don't want to add weight. Also, the metal strut on the front gear is very soft, needs to be replaced.
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Old 10-07-2013, 03:11 PM
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Quote:
Originally Posted by hadatom View Post
http://www.hobbyking.com/hobbyking/s...dProduct=17538
http://www.hobbyking.com/hobbyking/s...dProduct=28973

Use thinner wire for the struts, you don't want to add weight. Also, the metal strut on the front gear is very soft, needs to be replaced.
Thank you, I just ordered all three of them! :-)
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Old 10-07-2013, 05:44 PM
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Quote:
Originally Posted by Turbobearcat View Post
Thank you, I just ordered all three of them! :-)
The main gear installation is quite straightforward, but the front steerable gear is more frustrating and requires quite a bit of foam cutting to accomodate the steering arm and prevent binding during retraction. You may want to try it on a separate piece of foam at first to get the hang of it so you don't damage your aiframe unnecessarily. I used a thinner gauge metal rod for the struts and wrapped some scotch tape around the base of the strut to fill in the gap.
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Old 10-15-2013, 04:03 PM
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I compared the 10 blade Change Sun fan and the 12 blade fan, everything else remaining the same. The 12 blade fan has more power but drains the battery very quickly.
http://www.youtube.com/watch?v=cbfHvGXohdY
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Old 02-14-2014, 11:11 AM
  #98
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OK I now have the e-tracts installed but I kept the servo mount to the front LG and then bonded the front steering so only the servo moves the LD..
and the sound these things make is wonderful
http://youtu.be/xgkPpxkJRVE

testing is next and then the sky!

All servos that were related to the old way are now gone...the XB-70 is now lighter than before...
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Old 02-14-2014, 01:39 PM
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Quote:
Originally Posted by Turbobearcat View Post
OK I now have the e-tracts installed but I kept the servo mount to the front LG and then bonded the front steering so only the servo moves the LD..
and the sound these things make is wonderful
http://youtu.be/xgkPpxkJRVE

testing is next and then the sky!

All servos that were related to the old way are now gone...the XB-70 is now lighter than before...
Looks and sounds great. Look forward to hearing about the flights!
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Old 05-16-2014, 09:40 AM
  #100
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I just SNAGGED ONE!!!!!

There Is one grey one left in stock and these are the only two I know still in the wild...

Well now there is only 1!


Maybe if I am smart about this I can have somebody make a mold of it and make a new XB-70's with more detail based off the model
EPO and electric retracts.... Hmmmmm
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