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SZD Wampir II - looking for experiences

Anything to do with gliders & gliding.
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erikvanderkooij
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SZD Wampir II - looking for experiences

Post by erikvanderkooij » 17 Sep 2019, 22:10

There used to be a building review / thread of the 5m SZD 20x Wampir II on this forum. It seems to be gone. I'm looking for flying experiences with this plane. A friend of mine owns one, however he's having trouble flying it. Any info that can help is welcome!!
"When thou seest an eagle, thou seest a portion of genius; lift up thy head!" - William Blake

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Cliff Evans
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Re: SZD Wampir II - looking for experiences

Post by Cliff Evans » 17 Sep 2019, 22:25

It is not the easiest model to fly, typical flying wing! As stated in an email, it has a very narrow speed range, too fast and you get a lot of flutter, too slow and it will tip stall. there are three that are flying successfully that I know of and two being built.

https://youtu.be/iLf2K08yJLY?t=1

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erikvanderkooij
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Re: SZD Wampir II - looking for experiences

Post by erikvanderkooij » 19 Sep 2019, 12:24

Thanks for you reply Cliff.
Just to be sure, do you know the exact cog of the plane in the video? Is it adjusted compared to hte 446 mm from LE in the plan (see attachment)?
As you already stated, it is very critical when it comes tot the CG.
COG-LAYOUT.pdf
(46.62 KiB) Downloaded 17 times
"When thou seest an eagle, thou seest a portion of genius; lift up thy head!" - William Blake

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Cliff Evans
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Re: SZD Wampir II - looking for experiences

Post by Cliff Evans » 19 Sep 2019, 12:57

6mm in front of former arrowed.
Wampire CG.png

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erikvanderkooij
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Re: SZD Wampir II - looking for experiences

Post by erikvanderkooij » 19 Sep 2019, 13:07

great!
"When thou seest an eagle, thou seest a portion of genius; lift up thy head!" - William Blake

davinja
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Location: Vicenza

Re: SZD Wampir II - looking for experiences

Post by davinja » 06 Oct 2019, 11:22

Hi, I have two questions regarding the model WAMPIR II:
1) what are suggested aileron and elevator deflections for the model WAMPIR II ?
2) Erik refers to a build review in his first post, is there any chance to access to it? I am about to build this model and that review would help.
Thanks

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Cliff Evans
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Re: SZD Wampir II - looking for experiences

Post by Cliff Evans » 06 Oct 2019, 11:50

The build thread disappeared when the forum was changed to the new platform. There is nothing we can do to recover it. The best thing for you to do is contact Rich Vale on this forum, he built the original and has been flying it. You will find him in the member's list and can contact him from there.

davinja
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Re: SZD Wampir II - looking for experiences

Post by davinja » 06 Oct 2019, 12:10

Thanks Cliff, will certainly contact Rich

Rich vale
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Re: SZD Wampir II - looking for experiences

Post by Rich vale » 06 Oct 2019, 12:13

davinja wrote:
06 Oct 2019, 11:22
Hi, I have two questions regarding the model WAMPIR II:
1) what are suggested aileron and elevator deflections for the model WAMPIR II ?
2) Erik refers to a build review in his first post, is there any chance to access to it? I am about to build this model and that review would help.
Thanks
Hi
The model flies with ELEVONS, the inboard control surfaces are reversed in sense and only change nose up (surface down) and down (surface up)attitude without climbing or diving.
The ELEVONS have approx. 6mm reflex and move 30mm up and 15mm down. This is sedate and these may be increased to suit personal tastes.
The Wampir II does have a narrow speed envelope. Slow it to much, it will drop a wing but is easy to recover with a small loss of height. Over speed it and it will oscillate laterally between the fin bases but soon recovers when speed is reduced.
I may have some photos from the original build and if needed I will try and search them out.

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