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XB-70 EDF

Old 05-19-2014, 04:57 AM
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RC CASTLE has the only XB-70 left in the wild I know of... I just bought the next to last GREY model so I can install my own power plant...

can't wait to get this thing!!!!
Old 05-21-2014, 12:54 AM
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This XB70 is in existence!
40" span and built in 2 & 3 mm Depron. It was only recently completed.

It uses a 70mm AEO unit with a 2200mAh 3s and has a scale sextuplet exhaust but has an unusual 'plenum chamber' duct (up to 5 times the FSA!) between the fan and the nozzles.
Very light at 23oz it is hand launched and belly lands.
This is its second ever flight.
https://www.youtube.com/watch?v=hGB7We2oaP8 At the moment it is being modified to use an active canard in conjunction with the elevons..
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Old 05-24-2014, 02:42 PM
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I got my GREY XB-70 today, all I need to get this beast going is a 60amp ESC and a new EDF fan..thinking of using the V-15 by E-Flite and a 3600Kv motor...should be just like it's older brother.
Old 05-25-2014, 10:56 AM
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Now it's in the living room waiting for it's heart and soul to be installed :-)
Old 06-13-2014, 04:10 AM
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Originally Posted by gary41
+1 on this! CS10 draws more amps than 5 or 6 bladers. 1800-2100kv for 6S and 2300kv for 5S!
But will a 2600Kv or 2800kv work with the CS 10 on 4s???
Old 07-04-2014, 06:29 PM
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Well, I've had about 20 flights this season with my new setup,10 blade Change Sun fan, a 6 cell Turnigy 1800 mAh battery, HK 60A ESC, HK 2100KV motor and HK electric retracts. It gives me about 3.5 minutes of flight at about 60% power and two or three WOT awesome high speed passes. I tried the 12 blade CS but cannot see any benefit. My ESC is not even hot when I land but I placed it in high airflow area on the bottom. Also, I added a cheater hole on the bottom to increase airflow. Another advantage of the cheater hole is that it increases the Woosh! sound even at low throttle. It also needed about 3/4 oz of tailweight.I really love that plane, I have a spare but don't need it for now.
Old 07-04-2014, 06:31 PM
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Originally Posted by Turbobearcat
But will a 2600Kv or 2800kv work with the CS 10 on 4s???
In my opinion, CS 10 with 4S will be very underpowered.
Old 07-04-2014, 06:48 PM
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From the early test I done it blows very well on 4s so far..after I get everything setup and ready to roll it should tell all.
Old 07-04-2014, 06:54 PM
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Now after I did the electric retract change over - the weight shifted horribly to the rear of the plane which was odd, I had to move the battery forward and add 14 grams in the battery bay... now it's balances out at 455mm! Not sure what removing all of the servos would cause that much of an imbalance compared to the old setup out side of the fact I lost out on 1 servo and part of the front landing gear.. but overall the plane is now well balanced.
Old 07-05-2014, 05:59 AM
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Good luck!
Old 07-06-2014, 12:08 PM
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Ok I did the re-maiden of my old XB-70 last night with my new DX6 radio - very happy until the battery crapped out 3 minutes into the flight!!!!!
had to do a quick landing in the grass and forgot to raise the landing gear - cachunk! front lander came out and the wing tip broke as well.
Do got home and repaired the front gear..no problem...then the wingtip which I used epoxy and then used packing tape on the bottom and top to reinforce the wing tips (they are now stiff) and I checked the battery - had a cell off my 3/10th of volt more than the others but it drained the battery way too quick until I noticed which battery I used with this jet- LOL a 30c when it needs a 50-70c!!!
Went back to the field this morning and tried her again - this time we flew for 2.5 minutes to be safe running at half speed with a few full speed passes before landing somewhat nicely.
The Old XB-70 is back!

Last edited by Turbobearcat; 07-14-2014 at 02:14 AM.
Old 07-12-2014, 05:27 PM
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The Airframe 2 (V2) went airborne and handled very well today, flew for 3 minutes and then landed her, clearly needs an higher c rated battery after I looked at the ones I ordered I could slap myself in the face for it.. they are the Nano-Tech 2200 25 50C 4 cell batteries!!!! in V1 the battery was warm and in V2 it was hotter but not a deal killer.. Speed was good but not as good as I like to see (Hadatom you were nearly correct) however is got the power it needed and the sounds was very nice to hear. I might dumb down the EDF fan to a 5 blade for now until I get a higher C rated battery in the jet looking at 2200 45 90C 4 cell to try next. from the weight and dimensions it's almost the same size but 14 grams more I think.

Last edited by Turbobearcat; 07-13-2014 at 03:07 AM.
Old 07-13-2014, 04:57 AM
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Originally Posted by Turbobearcat
The Airframe 2 (V2) went airborne and handled very well today, flew for 3 minutes and then landed her, clearly needs an higher c rated battery after I looked at the ones I ordered I could slap myself in the face for it.. they are the Nano-Tech 2200 25 50C 4 cell batteries!!!! in V1 the battery was warm and in V2 it was hotter but not a deal killer.. Speed was good but not as good as I like to see (Hadatom you were nearly correct) however is got the power it needed and the sounds was very nice to hear. I might dumb down the EDF fan to a 5 blade for now until I get a higher C rated battery in the jet looking at 2200 45 90C 4 cell to try next. from the weight and dimensions it's almost the same size but 14 grams more I think.
I am not a battery/ESC/motor whiz but my own testing has shown that 6S is greatly superior to my previous setups. The 6S battery I use is only 40C. There is logic to this. More voltage means more power, without stressing my battery, my ESC or motor and can use a 10 blade CS with a nicer sound. The only downside is the extra expense in getting the proper battery, ESC and motor. However, if you need to spend on a higher C rated battery, you may want to consider this option which will set you back about $100, for the 6S battery, motor and ESC combined.
Old 07-14-2014, 09:02 AM
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Well my setup is the following in both birds
AV1(Air vehicle) - Delta V15 fan w/3600KV Eflite Pro Amp 60 amp esc battery: Elecifly 2200 30c battery.. 3.30 minutes
AV2 ( Air Vehicle)- Change Sun 10 blade 2800Kv HK 60-80 amp esc Battery: nanotech 2200 25-50c 2.5 minutes

both fly well but I need more power for AV2 - either I jump up to 3600Kv or I go with a higher C battery..
Old 07-14-2014, 11:57 AM
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Originally Posted by Turbobearcat
Well my setup is the following in both birds
AV1(Air vehicle) - Delta V15 fan w/3600KV Eflite Pro Amp 60 amp esc battery: Elecifly 2200 30c battery.. 3.30 minutes
AV2 ( Air Vehicle)- Change Sun 10 blade 2800Kv HK 60-80 amp esc Battery: nanotech 2200 25-50c 2.5 minutes

both fly well but I need more power for AV2 - either I jump up to 3600Kv or I go with a higher C battery..
Your ESC is massively sufficient to handle a 6 cell. I use a cheap Turnigy 1800 mAh 6S and a $13 HK 2100Kv motor which gives me 3 minutes of flight with bursts of more than 1:1 ratio. The 1800 mAh 6S is no heavier than the 2200 mAh 4 cell.
I have not flown my second Exbee but I have repainted it with Krylon chrome spray paint to give it a Cold War B-58 look. It will not melt the foam but you have to spray from at least 30 inches away in extremely light coatings and let it dry between coats. The XB-70 paint will bubble if the spray is too close or too heavy. I will post pictures.
Old 07-14-2014, 12:28 PM
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Have you tried Miniwax coating first??
Old 07-14-2014, 12:30 PM
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Originally Posted by hadatom
Your ESC is massively sufficient to handle a 6 cell. I use a cheap Turnigy 1800 mAh 6S and a $13 HK 2100Kv motor which gives me 3 minutes of flight with bursts of more than 1:1 ratio. The 1800 mAh 6S is no heavier than the 2200 mAh 4 cell.
I have not flown my second Exbee but I have repainted it with Krylon chrome spray paint to give it a Cold War B-58 look. It will not melt the foam but you have to spray from at least 30 inches away in extremely light coatings and let it dry between coats. The XB-70 paint will bubble if the spray is too close or too heavy. I will post pictures.
Yeah I would love to see the silver look for sure!!!!! have you found any vinyl for replacements for this bird?
Old 07-14-2014, 02:40 PM
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Originally Posted by Turbobearcat
Yeah I would love to see the silver look for sure!!!!! have you found any vinyl for replacements for this bird?
Sorry for my ignorance but what is miniwax ? Where do you get it? What do you mean by vinyl ?
Old 07-14-2014, 03:58 PM
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http://www.homedepot.com/p/Minwax-11...5555/100376152

Minwax Polycrylic Protective Finish is a protective topcoat for use on interior wood surfaces including furniture, trim, doors and cabinets. It can be used over bare wood and both oil-based and water-based stains. Polycrylic can be recoated in only 2 hours. Minwax Polycrylic resists damage from abrasion, scuffing, chipping, water, alcohol and other common household chemicals.

It's cheaper to buy it at Walmart. it helps protect the surface of the plane from say tipovers on the wingtips. it also helps those issues with dirt or paint chips.
the vinyl is the stickers on the plane.
Old 07-18-2014, 06:27 AM
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Just ordered 2 2200 4S 60c batteries.. they are near the same size of the batteries I am using.. but much higher rated..

3-3:30 minutes is the goal for now. and I don't normally fly balls to wall with this one - but those wide open blips are nice!!!
Old 07-18-2014, 02:36 PM
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Turbobearcat
I am not quite sure how higher rated batteries will improve the flight times.
At 50C your nano techs would discharge in just 1.2 minutes.
With a 3 minute flight your average discharge rate is 20C, well within the capabilities of a 50C battery.
Old 07-18-2014, 02:58 PM
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C rating has nothing to do with flight times, but they will offer more punch.
Old 07-18-2014, 05:10 PM
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Guys - hold your horses - read what I said before jumping me. read post #112 and #114 then #120

Right now I get 3.5 minutes with the 2200 4s 25-50C Nano tech battery (what I did not say is my older jet AV1 - Delta 15 unit and 3600kv)
My goal for V2 is the same 3.5 minutes since the 2200 4s 25-50c battery gave me 2.5 minutes with the Change sun 10 blade and Turnigy 2800Kv ( side note - 25c is constant while the 50c is a 10 second burst - after that you blew your load - not enough power for this setup except sounds good but with no extra power)

I bought a couple of Turnigy HD 4s 60c batteries for the extra kick since the other battery drained way too much (got hot) and the voltage was at 15.1v
So the higher C is to make sure that it's not over stressing the battery and also maybe getting the extra :30- 1:00 without worrying I'm going to fry the battery.

Last edited by Turbobearcat; 07-18-2014 at 05:56 PM.
Old 07-18-2014, 05:43 PM
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What size battery can I use to give mine a bit more speed? It has all the original electronics and motor.
Old 07-18-2014, 05:52 PM
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Originally Posted by Steve Westphal
What size battery can I use to give mine a bit more speed? It has all the original electronics and motor.
Steve

the question I have is what are you using at this moment?
1. You looking for extra punch on short burst?
2. More flight time?

answers to the above
1. Higher C rating - your stock esc is 45amps so I would go with 45-50c
2. going to a 5 or 6 cell as Hadatom has said or go with a higher rated battery like 3000Mah - would give you more fly time... make sure the battery is near the same measurements or you bought a battery for nothing.

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