Apprentice S15e Goes Rogue?? - Page 4 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-04-2015, 07:20 AM   #31
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Re: Apprentice S15e Goes Rogue??


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i just watched video and it appears to be major delamination of foam tail. procedures must not be perfect in these plants. keeping control horns tight helps but both ma apprentice tails wanted to delam. I try and catch it early with glue and tape. video did sound like the lion roar from loose horn tail flutter. and with safe trying to conter flutter cant be good. yup time fo a new tail section. and as noted above a better cervo.

Last edited by Haliburtonian; 12-04-2015 at 07:23 AM. Reason: forgot last part
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Old 12-04-2015, 07:28 AM   #32
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Re: Apprentice S15e Goes Rogue??

ya know it could be when the horns start to loosen. The holes which are somewhat tapped by the screw get slightly lifted apart by the threads of the screw starting the air bubble under that tail coating. I guess it is just a foam plane.
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Old 12-04-2015, 07:30 AM   #33
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Re: Apprentice S15e Goes Rogue??

I just got a rare bear. wish me luck
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Old 12-06-2015, 08:37 AM   #34
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Hey if not to late put your plane on stand. Wiggle elevator. Has your horn cut right through. That is worse than loose. When I cut through (overtightened) tail fluttered and roared like a lion. But makes sense as now horn is only moving itself not flight surface. Thanks for listening. I only talk from experience. Good luck and wold peace
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Old 12-06-2015, 08:40 AM   #35
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That rx should last for years its not doing the physical work. You should not have to replace rx. Keep it as a trainer.
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Old 12-06-2015, 11:32 AM   #36
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Re: Apprentice S15e Goes Rogue??

A carbon fibre spar/ rod across the stab would fix it. Obviously the stab is too flexible.
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Old 12-06-2015, 11:44 AM   #37
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Just make a carbon fiber tail. Or reinforce area under horn. Do you want the horn to move or the flight surface. I have no more to say. Thank to all for great ideas. Peace
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Old 02-29-2016, 04:22 PM   #38
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Re: Apprentice S15e Goes Rogue??

Good to hear cause I just bought one for my son and we are just trying to figure it out.
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Old 08-24-2016, 01:00 PM   #39
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Re: Apprentice S15e Goes Rogue??

Quote:
Originally Posted by stegl View Post
I would call that severe tail flutter as I didn't notice much to the control horn movement but it doesn't take much.
At our field the Apprentice is by far, the trainer of choice. It is a good plane, but not perfect. The tail flutter thing is very common. We train our students with the SAFE mode off, and use the buddy box method with great success. I got back into the hobby a couple of years ago after about a 30 year hiatus that I used to raise a family. I took the SAFE rx out after about the 4th flight. Even with an experienced instructor on a buddy box, and the SAFE turned off, the plane just seemed to dive in for no reason. While I was at the hobby shop getting the parts to fix it I picked up a Spektrum, non SAFE rx and put that in, and flew the rest of the season without incident.
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Old 08-24-2016, 01:44 PM   #40
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Re: Apprentice S15e Goes Rogue??

No experience with the "Safe" gear, but it seems a lot of these stab systems need to have a horizontal reference when initializing with absolute stability till complete, a horizontal version of the tail gyros for helis.

What that meant was the craft had to be held stable at the flying attitude until the setup would complete. Any angle difference, (roll or yaw) or movement before that was done and the whole reference would be off.

As for flexible tails, the original foamie Polaris suffered that way and required some creative C/F or wood bracing to stiffen up. The larger XL seems to really exhibit tail wobble.

The end result of a stab system trying to compete with loose tail surfaces could lead to overworking the servos trying to keep things in line.
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