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171" lANYU Minimoa

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Old 03-13-2014, 06:07 PM
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wingspar
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Default 171" lANYU Minimoa

I've been flying a yellow KA-8 for about a year now and was looking for something different. I really like the looks of the vintage gliders especially the Minimoa. I also found that with its wider gull wing design, it was much easier to see up high. So, when BK Hobbies was having a closeout sale on the Lanyu Minimoa, I jumped at it.

It arrived today in a very large and stout box. This is just the perfect size sailplane for me. It's large but still is able to be towed without using one of the big tugs.

Took out the fuselage and examined it. This is a built up fuselage and not fiberglass. The forward half appears to be planked with thin plywood and no attempt was made to sand it smooth. I'm currently planning on striping off the covering and doing some filling and sanding before fiberglassing.

The painted on red trim was rough and there are areas of over spray.

The wings mount by installing screws into steal brackets. Then somehow yuu have to attach a piece of vinyl plate to cover the one inch gap between the wing and the fuselage. I'm rethinking how this is done. Possible change it over to carbon fiber tubes.

The air brakes that came with the kit are real nice and extent above and below the wing as the fully scale plane did.

I also like that all the control surfaces are removable.

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Old 03-14-2014, 09:55 AM
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i'm planning to strip off the old covering and recover it with solartex. This is waht I'm going to duplicate.
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Old 03-14-2014, 06:32 PM
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Very nice color scheme , I think I'll steal it .
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Old 06-04-2014, 04:21 AM
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Hi,
Have you started the build yet?

I just picked up the Lanyu 4.36 meter Minimoa and will start the build soon.
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Old 06-04-2014, 06:03 AM
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Yes, it's done. It's not a kit I would recommend but for the price I got it for, I can't complain to much.

The forward part of the fuselage is planked with 1/32nd? plywood. You will find it especially easy to punch your fingers through if your not holding it at the formers. After trying to fix it a few times I stripped off the covering and fiberglassed the entire cockit area with two layers of 1.5 oz cloth and west system epoxy. I coated the back part of the fuselage with epoxy and no cloth. Now it is nice and firm with no worries on handeling it. Also there is no skid on the lower front and rear of the fuselage so I added it on.

The wings are held on by two bolts at the main spar area and a antirotation bolt in the rear. This leaves a one inch gap between the fuselage and the wing that is somehow covered with a plastic strip that just didn't work very well. At least for me. So I filled in the gap with balsa and plywood leaving an access holes for the bolts with little hatches held on by magnets.

On the right wing all the mounting bolts and antiroation bolts lined up perfectly. However, on the left they did not. When the two main bolts were installed, the rear antiroation bolt was about two inches!! off. Of course the wing incendence was way off also. So I ended up grinding down and shimming the other side of the lower mounting bracket so as to bring the antirotation pin into alignment.


I did used the airbrake included in the kit but couldn't get it to work properly driven horizintally. I changed it around driving it with a vertical rod. Now it works perfectly.


The canopy comes with some light framwork that needs to be assembled. Good luck with that. I scratch built my own framwork that is much more solid.

I also stripped of the covering from the wings and recovered it with Solartex.

Anyway, Got the tow plane lined up and the first flight should be this Saturday. :-) I'll post some pictures and a flight report afterward.

Good luck on your build!!

Dave N
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Old 06-09-2014, 06:45 AM
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And fly it did this last Saturday. I was alittle concerned if a 55cc towplane would haul it up but under the skillful direction of Don Bailey, this proved to be a non issue.

Balancing right at the aft portion of the wing joiner proved to be just about right. Flew well and much better then my KA-8. It stayed up much better then my other Sailplane even with my nonexsistant sailplane experience.

The air brake/spoiler showed no tendency to pitch change when deployed.

Looks great in the air and is easier to see higher up compared to other models.

As this ARF required alot of "fixes", this is not an ARF I would recommend.

I'll be at the Northwest Aerotow at Monroe, WA near the end of July this year.

Dave N

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Old 06-09-2014, 03:11 PM
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Well done sir , it's a thing of beauty.
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Old 06-10-2014, 09:41 AM
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Not to barge in on your post, but I just picked up a Graupner Minimoa 110" still new in the box. As this sailplane is out of production, I was looking for a little help. It is the version that has a fiberglass fuse and beech covered wings. Is there a place I can go to find any flying hints? And other than getting with the local Sailplane guys, any advice? Thanks in advance.
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Old 06-10-2014, 10:48 AM
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Jeff, I'm not familure with that kit. Hopefully someone here with experience on it will chime in.

Good luck!

Dave
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Old 06-11-2014, 09:27 AM
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http://www.youtube.com/watch?v=gaCVQOhqjtg shows that it's a slope soarer.

Here is some information. I'd agree with them regarding balance at 45%-50% (even 53%) of inner wing chord (the outer wings sweep back). That's a calculation result based on 6 aerodynamic decalage, meaning about 2 geometric decalage for a true Clark Y (not a flat-bottom something), which has zero lift at -3.8 angle of attack, and a symmetric stab.
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Old 06-11-2014, 10:53 AM
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It looks loke a nice soaring plane. This could be fun
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Old 07-02-2014, 02:41 AM
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Wingspar,

I'm starting mine and added epoxy + fiberglass to the fuselage to strengthen the balsa strips.

Question: how and where did you install your tow release? For the rudder did you use a pull-pull system and how did you mount your servo?

If you have any pictures that would help. I have an idea of what I want to do but maybe you're installation may be better.


thanks
Charles
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Old 07-02-2014, 05:31 AM
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Charles,

I'll post some pics tonight.

Dave N
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Old 07-02-2014, 08:28 AM
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Great !! Thanks

Another question while I'm at it. I've been reading on the french forms that some of the guys have had problems with the wing joiners with the 5+ meter version. Some of them have had the wings come off after 3 - 4 flights. The posts date back from 2009 so I ignore if the problem was fixed or not. Tonight when I get back I'll be checking the fixtures that hold the wings.

Did you do anything special on yours apart from the ant-rotation pin fix?
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Old 07-02-2014, 09:30 AM
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I haven't seen any issues with it on mine yet. Looks very strong with good quality steel being used.

Dave N
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Old 07-03-2014, 05:54 AM
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The rudder is of a pull/pull setup with the elevator servo located just below the tail.

The tow hook consists of a wire loop in the nose with a wire pin that moves in and out supported by a brass bearing.



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Old 09-17-2014, 01:27 PM
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Hi Wingspar,

I forgot a very important question: What was your final flying weight?
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Old 09-17-2014, 07:05 PM
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Originally Posted by jeffEE View Post
Not to barge in on your post, but I just picked up a Graupner Minimoa 110" still new in the box. As this sailplane is out of production, I was looking for a little help. It is the version that has a fiberglass fuse and beech covered wings. Is there a place I can go to find any flying hints? And other than getting with the local Sailplane guys, any advice? Thanks in advance.
Try RCAerotowing.com
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Old 09-18-2014, 05:09 AM
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Originally Posted by Charlesd View Post
Hi Wingspar,

I forgot a very important question: What was your final flying weight?
I don't have an accurate way to measure its weight. My bathroom scale just is that good. :-(

Dave
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Old 11-28-2014, 04:48 PM
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Bathroom scale would be fine. It's just to give me an idea. I'm still debating whether to tow it or install a motor.
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Old 11-29-2014, 06:38 AM
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I envy anyone that gets to see that doing slow flybys......
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Old 12-02-2014, 06:33 PM
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Well I did not sell it. I built it. Here it is. Now I just need to get a launch system, and find a nice day to try it out.
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Old 04-19-2017, 04:57 AM
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Default Lanyu build

Hi Dave
The Lanyu Mlnimoa looks to be a big build. I just pickup up a slightly damaged one to get going.
i see what you mean about thr kit engineering not being great.
What was your final CofG?
Do ou have approx AUW? . Travel scales do the job for a few dollars
Do you still fly it?
Thanks
Deano

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