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Old May 06, 2015, 01:32 PM
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Gugie
United States, WA, Gig Harbor
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Build Log
RCA's new 82" composite B-25J

Gang starting a build on the new RCA B-25J
Here's some information on the kit:

Dimensions-
Wingspan: 82"
Length: 63"
Weight: ~18lbs
Channels: 6

Features-
Fully composite (Full Fiberglass Epoxy Wings and Fuselage)
Detailed cockpit with lighted console
Scale electric retracts & wheels included (Functioning scale oleo struts)
3 different paint schemes (Apache Princess, Yellow Rose, Pacific Prowler)
Scale fittings (guns, scoops, engine nacelles, dummy radial engine plate etc)
And so much more!!!

What you need to provide-
Min 6 channel radio
(2) 40mm brushless outrunner motors
(2) 80amp brushless speed controllers
(10) servos
(2) 12x8 3 blade props
(2) 5s or 6s 4000 - 5000 mAh lipo batteries

Will start the build and post some pictures this evening
This is one BIG nicely detailed war bird!!!!

Here's some pictures from the RCA web site:
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Old May 06, 2015, 03:02 PM
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Looks pretty nice... do you have a link to that website? I couldn't find it. Also, who is the dealer for these?
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Old May 06, 2015, 03:08 PM
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warbirdfan2 the dealer is RC Aerodyne.
Here's the link:
http://www.scaleflying.com/Super-Sca...s-_p_4214.html
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Old May 06, 2015, 05:24 PM
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Thanks for the info...I will be looking for more pics from your build.
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Old May 06, 2015, 11:37 PM
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Which version are you buying? Do you have it yet?
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Old May 07, 2015, 02:35 PM
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Heirmeister I have the "Yellow Rose" version.

Sorry that I didn't post any pictures. Was working on the nose gear door and before I knew it, it was pretty late.


I sort of been working out of order as I wanted to tackle the landing gear first and the doors which can typically be a challenge.

Here's a quick assembly picture
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Old May 07, 2015, 03:54 PM
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Can you post a picture of the battery hatch? I thought RCA didn't have the landing gear yet? That's the same model I am thinking of buying.
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Old May 07, 2015, 05:24 PM
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Quote:
Originally Posted by Heirmeistr View Post
Can you post a picture of the battery hatch? I thought RCA didn't have the landing gear yet? That's the same model I am thinking of buying.
I was going to ask the same thing. I am interested in seeing the battery hatch and how it is held on, and the amount of space for batteries. Are the gear and wheels on your model the ones that come with the model? Are they electric?
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Old May 07, 2015, 06:47 PM
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Heirmeister attached is a picture of the battery mount. It's located under the cockpit floor.
As for the landing gear the mains are OK but the nose gear is not the right one so we had to modify one. The strut height is right but the tire fork is not. Cliff is expecting the right one soon.
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Old May 07, 2015, 06:49 PM
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warbirdfan2 the cockpit is held on by magnets and dowel pins. To get to the batteries you slide the cockpit forward and up. Pretty simple with plenty of access.
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Old May 07, 2015, 08:24 PM
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The nose gear is a little short and also the wrong style strut.
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Old May 07, 2015, 08:45 PM
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I don't understand why a pair of props aren't included with the kit. Well with that said, are they counter rotating props? What are they made of?
Are nav lights included in the kit? Are you going nitro, gas, or electric?
I am assuming electric? If so, what motors are you planning to use?
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Old May 08, 2015, 01:07 AM
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Not sure about the props. The props I'm swinging are Graupner 3 bade 32-18 (Will switching to 12 x 8 when I can)
This one will be electric. Motors are Scorpion SII-4020-630KV
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Old May 08, 2015, 10:46 AM
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For this model we started out with the harder steps first. (Landing gear, gear doors, motors and cowlings)
As per the instructions epoxy the motor mounts inside left and right nacelles then epoxy in the retract mounts for both sides.
The main gear went in pretty much as defined in the instructions. The mount has a cleaver attachment scheme with a notch that the forward gear mounting tabs slide into with you just needing to bolt in the rear tabs


Now the challenging part. (At least for me) Gear door hinges have always been a challenge for me. If you donít have the hinge points aligned for all the hinges being used youíll get some binding. The worse the misalignment the more the binding. If youíre using a servo with a sequencer you may be able to get by with some small amount of binding, But with these doors being controlled with some spring wire there really canít be any binding otherwise the doors wonít open the way you would expect them to.


In this case it took several tries before we had some doors that would operate properly.
The instructions donít show you clearly where the hinges need to be installed so the things you need to pay attention to are:
1) Location of spring wire so that it hits the strut in a good spot and not on the scissor part or any other place that would cause the wire to get hung up.


2) Donít over tighten the spring wire. (Better to initially have the doors not close all the way and make small adjustments to get them closed properly)
3) Since the spring needs to be hitting about mid-part of the strut the spring hinge is going to be mounted close to the retract bulkhead so measure and mark the hinge locations to make sure youíre mounting the hinges to where it will mount on the outside of the bulkhead. (See picture above)
4) Since the pushrod keepers need to be able to pivot you canít tighten the holding screw. But if you leave this loose it will easily spin off. To fix this you need to apply a little bit of CA or use Loctite to keep the holding screw from backing out.


Bellow is a picture of where we located our hinges.
On my installation the hole tabs on rear hinge on the outside binded with the strut when it was retracting. To fix this I trimmed the hole tabs off the hinge. (Note yellow arrows below)


Note the missing bolt at the rear mounting tab! (Whew glad Iím writing this otherwise I may have missed this)
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Old May 08, 2015, 12:09 PM
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Does video exist right now for this model?
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