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BJ Craft Agenda w/Brenner V4 Drive

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Old 04-14-2017, 11:19 AM
  #1
TonyF
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Default BJ Craft Agenda w/Brenner V4 Drive

Okay, I know the Agenda has been around for a while. I've seen a lot of very happy pilots with G2 models. But until recently I wasn't one of them. But BJ has sent me an Agenda so I thought I'd share my techniques and experiences with it. I may be repeating stuff that is already out there and I am going in to some detail. But maybe I'll help someone out there.

Here it is out of the box. It's been a while since I've received one and BJ Craft has greatly improved their shipping container. Very well packed. I suppose someone will always figure out a way to damage one but this box did a good job on mine.

First job was to take the V4 Drive and the Kontronik 650 motor out of the Episode to begin the Agenda installation. I took the time to thoroughly clean the drive. Looks like a lot of parts but the V4 actually has a lower parts count then the V3.

In the Episode I used the thin carbon fiber triangle mount that the V3's came with to mount the motor. I decided I wanted a larger footprint for this installation so I used a different mounting plate that I had on hand. I had to do a little grinding for it to fit the 4mm screws used on the 650 motor. Note the marking defining top and front. I like to keep track of that in case any asymmetry should creep in.

Here's the drive unit slipped on to the front of the motor. It mounts like a lot of prop drivers on electric motors, with a split collet.

I had a template for the installation of a V3 unit in to an Agenda that I did earlier for Matt Griffitt. I had to do a little geometry drawing on it to locate the center. I could then locate the four holes for the new mount on to the template. Once done with that I could drill for the 6-32 aluminum screws used to mount it on to the wood. I just use a good grade of 5-ply 1/8" plywood for this mount. Others go exotic with carbon but I'm cheap. And wood is a lot easier to work with then carbon. And it is plenty strong enough for the job. Removing the pounding vibration from an IC engine also helps a lot.

Note the four donuts to mount the blind nuts to the former. They are 1/4" 5-ply.
I was a machinist in my youth so many of these techniques come from that background. Plus I always did well with geometry!
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Last edited by TonyF; 04-14-2017 at 11:25 AM.
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Old 04-14-2017, 11:24 AM
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TonyF
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Now I took the 1/16" ply nose ring spacer I made up several installations ago and lightly tack glue it to the nose. Just three very small spots of medium CA is what I used. This creates the slight spinner gap you need for a smooth running system.
BTW, the airplane is exactly as I received it from BJ Craft. I'll note when I have to do any work on it.
Now the motor with the former bolted on using the vibration dampeners is slipped in to the fuse from the back. The drive unit is then installed on to the motor, making sure it is seated all the way back on the motor shaft. Then the backplate of the drive is centered up on to the fuse and taped in place.



After taping everything in place, the former and motor should be slightly loose in the fuse. You should be able to rock the motor slightly. You do not want any pressure between the fuse and the former at this point. If you do, it is very likely to distort things and the motor will not stay aligned after you glue the former and remove the tape. So for here, slightly loose is good!
Building turbine jets a few years back I was introduced to Loc-Tite Hysol 9462 epoxy. It is by far the best adhesive to use when gluing to a fuse. Good for a lot of other things, also. Big thing about it is that it is thixotropic, which is a $10 word for it stays in place. It will not run or sag. It comes in the tubes and you use a gun to expel the glue. Before that you install a tip on to the gun that mixes the epoxy as it goes out the tip. I try to keep my glue jobs reasonably neat so after I get the glue in place I try to clean it up using mixing stick and Q-tips.
Here it is after gluing. OK, not my neatest job, but it was late at night! Last pic was this morning after removing the tape.
BTW, when the glue is drying, do not leave the fuse horizontal. Put it on the tail and block it up so the nose is pointing straight up. This will relieve any stress from the weight of the motor that might deform things causing a loss of alignment.
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Old 04-15-2017, 05:08 PM
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J Lachowski
 
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Mine has just over 150 flights on it with the 650-830 and V4 on 22X20 and 22X22 Falcons. Dave Snow assembled mine. Just make sure the wing and stab alignment are on. Dave had to reset the stab alignment on it. I hated the plane early on. Turned out I was flying it too slow. I don't even use the brake, just a low idle and is a happier flying setup for me. It is just a draggier airframe in comparison to my Allure. I also fly it with 6000ma packs. Also have an Invitation. Dave had to reset stab on it, as well. Agenda is much easier to fly with the Contra in comparison to the Invitation on a 3-blade.

Last edited by J Lachowski; 04-15-2017 at 05:16 PM.
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