Electric Pattern Aircraft Discuss epowered pattern aircraft in this forum

BJ Craft Agenda

Reply

Old 10-30-2017, 07:29 AM
  #76  
willyuk
 
Join Date: Nov 2005
Location: , UNITED KINGDOM
Posts: 51
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

As promised an update following my trial flights. Ordered an agenda today, so clearly I liked it. Not ordered the contra unit yet as the BJ xdrive "may" be available soon so I am waiting to see if that is a possibility.
Thanks for all the input, I appreciate you folks taking the time to help

Al.W
willyuk is offline  
Reply With Quote
Old 10-30-2017, 09:19 AM
  #77  
ltc
My Feedback: (3)
 
Join Date: Mar 2010
Location: Mendon, MA
Posts: 1,023
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by willyuk View Post
As promised an update following my trial flights. Ordered an agenda today, so clearly I liked it. Not ordered the contra unit yet as the BJ xdrive "may" be available soon so I am waiting to see if that is a possibility.
Thanks for all the input, I appreciate you folks taking the time to help

Al.W
If you looking for a belt drive Contra unit, similar to the X drive, the Akiba Contra drive is available from Morris Hobbies in Japan
‚²[‚Ü‚éƒRƒ“ƒgƒ‰ƒxƒ‹ƒgƒhƒ‰ƒCƒu
They are very nice to work with; they have been able to get me a belt drive for my Fantasista 70 (50 products,. who designs the unit, wouldn't ship outside of Japan).
ltc is offline  
Reply With Quote
Old 12-01-2017, 10:21 AM
  #78  
barnowljenx
 
Join Date: Dec 2009
Location: Bury St EdmundsSuffolk, UNITED KINGDOM
Posts: 75
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Having just bought a second hand Agenda and separately a second hand Leomotion/CRS drive I've now managed to fly the combo. I was surprised to find that the aircraft pulled to the right on a vertical and required a fair bit of rudder to compensate. I'm running a Falcon 22x18 Front and 22x20 Rear. Has anybody else found this with the CRS drive in the Agenda?
barnowljenx is offline  
Reply With Quote
Old 12-01-2017, 11:00 AM
  #79  
underdw
My Feedback: (2)
 
underdw's Avatar
 
Join Date: Nov 2004
Location: Erie CO
Posts: 359
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Contra planes should pull straight - one of the primary motivations for having a contra.
I thought the Agenda was purpose-built for contra, but maybe the nose-ring of the plane has some right thrust built in - hard to measure, but I'd guess this is what is causing the pull.
Another possibility is a longitudinal warp in the fuse or fin.
underdw is offline  
Reply With Quote
Old 12-01-2017, 02:32 PM
  #80  
rm
My Feedback: (27)
 
rm's Avatar
 
Join Date: Nov 2002
Location: ohio
Posts: 542
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Should be easy enough to measure your thrust angle and see if you have the drive mounted correctly
rm is offline  
Reply With Quote
Old 12-01-2017, 03:47 PM
  #81  
barnowljenx
 
Join Date: Dec 2009
Location: Bury St EdmundsSuffolk, UNITED KINGDOM
Posts: 75
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I should have said, the drive that was in it was a CRS and mine has just been bolted straight in using the same fitting. The airframe flew in a straight line before I bought it. The spinner is aligned with the nose ring in vertically and horizontally. I was wondering if anyone had experienced the same thing. As far as I can see, the geometry is exactly the same but the aircraft now pulls to the right. I thought that there was roughness on the front prop bearing and have returned the gearbox to the manufacturer for checking. I guess I need to wait to find out whether there is a problem with the gearbox I bought.
barnowljenx is offline  
Reply With Quote
Old 12-02-2017, 05:03 PM
  #82  
barnowljenx
 
Join Date: Dec 2009
Location: Bury St EdmundsSuffolk, UNITED KINGDOM
Posts: 75
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I sent the gearbox back to the manufacturer, Ralph Schweizer Model Technik, and Ralph has identified some significant damage to the front prop drive shaft and bearings. This he is repairing. I begin to think that this damage might have resulted in improper torque sharing by the "differential" gearbox and may have caused the yaw to the right. I won't know for sure till I'get the gearbox back and fly it in the aircraft. I'll post when I've done that.
barnowljenx is offline  
Reply With Quote
Old 12-02-2017, 09:31 PM
  #83  
rm
My Feedback: (27)
 
rm's Avatar
 
Join Date: Nov 2002
Location: ohio
Posts: 542
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

My agenda I shimmed a little of the down thrust but the side thrust was pretty much on. That was after mounting the drive to match the nose ring.
rm is offline  
Reply With Quote
Old 12-02-2017, 11:04 PM
  #84  
f3a05
 
Join Date: Mar 2005
Location: Saffron Walden, UNITED KINGDOM
Posts: 561
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by barnowljenx View Post
I sent the gearbox back to the manufacturer, Ralph Schweizer Model Technik, and Ralph has identified some significant damage to the front prop drive shaft and bearings. This he is repairing. I begin to think that this damage might have resulted in improper torque sharing by the "differential" gearbox and may have caused the yaw to the right. I won't know for sure till I'get the gearbox back and fly it in the aircraft. I'll post when I've done that.
I seem to remember a story about Mr Schweizer seeing a photo posted somewhere, showing a model resting on its spinner (part of one of his contras), and emailing the owner,warning him not to do that!
Significant?
f3a05 is offline  
Reply With Quote
Old 12-03-2017, 03:36 AM
  #85  
barnowljenx
 
Join Date: Dec 2009
Location: Bury St EdmundsSuffolk, UNITED KINGDOM
Posts: 75
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Interesting! I have stored my Hacker C50-13XL powered birds resting on the spinner and those were soft-mounted using the same bobbins as for the CRS drive. I have not noticed any change of thrust line for either my Citrin or Toxiris but it bears consideration for all soft-mounted motors. Currently, it's not an issue as my Agenda is sitting on its bare nose ring. I will ask Ralph for his recommendation when I next email him.
barnowljenx is offline  
Reply With Quote
Old 12-04-2017, 12:22 PM
  #86  
David Bathe
 
David Bathe's Avatar
 
Join Date: Mar 2008
Location: Oslo, NORWAY
Posts: 1,227
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

A very pretty aeroplane... the look of which is holding up very well, even now that Bruckmann's Pandora has made almost everything else look redundant. The american designs are looking positively vintage by comparison.
David Bathe is offline  
Reply With Quote
Old 01-20-2018, 07:52 AM
  #87  
mups53
My Feedback: (41)
 
Join Date: Jan 2002
Location: Hoffman Estates, IL
Posts: 2,341
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hey Guys
The newest Contra ready plane from BJ Craft is the Version 2 AJ Scheme Element.
Here's the new listing:

https://www.f3aunlimited.com/bj-craf...r-contra-setup
Thanks for your support.
Mike Mueller
F3A Unlimited
mups53 is offline  
Reply With Quote
Old 01-25-2018, 08:44 AM
  #88  
willyuk
 
Join Date: Nov 2005
Location: , UNITED KINGDOM
Posts: 51
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi All, quick update on my Agenda build. I went with the Adverrun which arrived this week. The build has been going well thanks to Steve's build log and various other posts on the forum. I am on the last stage, fitting the motor is basically all that's left to do apart from all the checking and testing. Interestingly the latest version of the Adverrun has a greater distance from the back of the firewall to the spinner backplate. I did not have the potential issue that Steve had, I needed to make up an 8mm thick carbon/ply sandwich to get the correct spacing for the spinner. Also the prop fitting has changed and the rear prop is a single large nut now, not 4 bolts.
So I am looking forward to spring, good weather and the first flights.

Al.
willyuk is offline  
Reply With Quote
Old 01-28-2018, 05:21 PM
  #89  
shannah
Thread Starter
My Feedback: (5)
 
Join Date: Sep 2004
Location: placentia, CA
Posts: 1,151
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Good to hear that things fit well. The new Adverrun drive looks like it has some advantages. You’ll enjoy the combination. Mine is still working flawlessly.
shannah is offline  
Reply With Quote
Old 05-10-2018, 03:28 PM
  #90  
barnowljenx
 
Join Date: Dec 2009
Location: Bury St EdmundsSuffolk, UNITED KINGDOM
Posts: 75
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Question for Steve Hannah.

Steve, did you mount your batteries so that their centre line is aligned with the cenrre of the motor shaft. I'd heard that having a Kg of Battery off centre from the prop shaft can lead to a slight disturbance in roll. I have to say that I provide all the disturbance in roll on my Agenda(!) but would be interested to hear of your experiences in this regard. If it is a significant issue, then I'll make up a new battery tray to raise the batteries from their current position which is well below the motor centreline.

Thanks.

Peter
barnowljenx is offline  
Reply With Quote
Old 05-10-2018, 04:07 PM
  #91  
shannah
Thread Starter
My Feedback: (5)
 
Join Date: Sep 2004
Location: placentia, CA
Posts: 1,151
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hi Peter,

No, I did not center the batteries on the prop shaft. I put my battery tray right on top of the landing gear mounting bulkheads, just like the other BJ Craft planes. I think it rolls nicely as it is. But, I don't think it would hurt anything if you raised them up to be inline with the prop/motor shaft. On the new Eternity bipe, B.J. suggests moving the battery up.
shannah is offline  
Reply With Quote
Old 05-11-2018, 02:18 PM
  #92  
barnowljenx
 
Join Date: Dec 2009
Location: Bury St EdmundsSuffolk, UNITED KINGDOM
Posts: 75
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Thank for that insight Steve.
barnowljenx is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service