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J3hne06/04/2018 07:35:51
67 forum posts
44 photos

Purchased xcalibur 2nd hand.

All ok except after hard landing elevator horn pulled out.

Frightening to think that airworthiness of jet relies on 2 very small screws.

Suggest a visit to the elevator horn before the unthinkable happens.

Pic attached and also my upgrade.20180406_070913.jpg

J3hne06/04/2018 07:42:26
67 forum posts
44 photos

20180406_070735.jpgThis is all that stands between you and a disaster.

Top of the range servos mean nothing when the horns are fixed like this.

Edited By J3hne on 06/04/2018 07:45:22

Edited By J3hne on 06/04/2018 07:46:05

Phil 906/04/2018 07:45:49
4279 forum posts
218 photos

I would be rreluctant to use that on a 40 size trainer

J3hne06/04/2018 07:47:25
67 forum posts
44 photos

Let's hope Ripmax do something to address this issue

Bob Cotsford06/04/2018 09:08:13
7871 forum posts
433 photos

That's a bit scary - what does it screw into? If I do use screws I like them to be going into 5mm of birch ply at the very least. I have bought second hand models where the horns were screwed into balsa with a drop of CA surprise

Tim Flyer06/04/2018 09:15:57
998 forum posts
165 photos

To be fair the horn is probably strong enough for most planes . I use the same nylon type myself . Problem is with the way it is attached. I usually use bolt through with M2 bolts from “model fixings” whose great quality parts I trust. I nearly always replace all the fixing and thread hardware on Ripmax models. The only time I ever use them is when I Epoxy the whole thread in if I’m desperate. I’m afraid what you found is the risk in buying second hand ARTFs. The builder should have at least epoxied the thread right through and if like me would have also glued in the horn. It seems that only two or so threads have contact with glue so it’s really also a builder error in my view,

extra slim06/04/2018 10:35:14
443 forum posts
48 photos

worrying, I have seen a growing trend of chest puffers with "I've got 10-15kg digital servos, cost me £70 each!".. but no attention is paid to pushrods, clevis', wire connections on pull pull, the area horns are mounted to on the airframe, the correct alignment, screws/bolts for horns, horn type, slop etc.... a control system is only as good as the weakest point... but so many think because they have spent a lot of money on a premium servo, they have done the right thing... WRONG..doh!

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