GK 1 ZU BLJ is flying

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Neville Ferreira
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Wed Feb 17, 2021 4:58 am

Flight Test done.
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Sat Feb 20, 2021 5:26 pm

4 flight today:

FAKT-FABS
FABS-FAKT
FAKT-FASI
FASI-FAKT

Total flight time 1:34 and 22L used. Average speed over 4 flight 178mph. Max speed on gps 217mph.
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Re: GK 1 ZU BLJ is flying

Unread post by richard C » Sat Feb 20, 2021 6:16 pm

There is something very 'Mew Gull' about this aircraft in the coolest possible way.
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Sat Feb 27, 2021 2:51 am

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Re: GK 1 ZU BLJ is flying

Unread post by GL » Sat Feb 27, 2021 6:58 am

Lovely!
Full report out tomorrow in March SA Flyer
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Sun Apr 11, 2021 5:43 am

218mph achieved all below 1500' above the runway.
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Last edited by Neville Ferreira on Tue Apr 13, 2021 9:45 am, edited 3 times in total.
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Re: GK 1 ZU BLJ is flying

Unread post by Chalkie » Sun Apr 11, 2021 12:09 pm

Hi Neville, just a thought. In an RV-4 / -6, the only flight control that is not balanced is the rudder and this is the first control to flutter as has been demonstrated by that dentist fellow in the USA who has a super fast RV-4.

So question: are both the elevators and the rudder not balanced in the GK 1, or do the elevators have an internal balance weight?
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Sun Apr 11, 2021 2:06 pm

Chalkie wrote:
Sun Apr 11, 2021 12:09 pm
Hi Neville, just a thought. In an RV-4 / -6, the only flight control that is not balanced is the rudder and this is the first control to flutter as has been demonstrated by that dentist fellow in the USA who has a super fast RV-4.

So question: are both the elevators and the rudder not balanced in the GK 1, or do the elevators have an internal balance weight?
Chalkie, this is a question to be answered by Russel Phillips. I just fly the GK, and keep below vne 230 mph. From memory but please do not quote me, stick forward = houses get bigger.
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Re: GK 1 ZU BLJ is flying

Unread post by Jaco-P » Tue Apr 13, 2021 2:46 pm

Neville Ferreira wrote:
Sun Apr 11, 2021 5:43 am
218mph achieved all below 1500' above the runway.
Nice pic (the first one) :wink:

And yes - Its my pic. :)

It makes a fantastic noise that I can tell you!
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Tue Apr 13, 2021 3:26 pm

Looking over the nose on landing is not an option.
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Sun Apr 25, 2021 6:02 pm

[media] [/media]
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Re: GK 1 ZU BLJ is flying

Unread post by wallaby » Mon Apr 26, 2021 11:43 am

Jislaaik Neville, daai aerie klink bitter mooi!
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Re: GK 1 ZU BLJ is flying

Unread post by Induna » Mon Apr 26, 2021 12:01 pm

wallaby wrote:
Mon Apr 26, 2021 11:43 am
Jislaaik Neville, daai aerie klink bitter mooi!
En hy lyk ook mooi!
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Re: GK 1 ZU BLJ is flying

Unread post by Johan Swakopmund » Mon Apr 26, 2021 12:32 pm

Neville
Het jy al voorheen die enjin en prop spesifikasies geplaas.
Byvoorbeeld wat is die aan die enjin gedoen / petrol inpsuiting , is dit elektroniese onsteking of het dit n Magneto
een of twee plugs per silinder.
Wat is die reduction na die prop en wat se prop het jy op. Wat is die reduction ratio.
Hierdie lyk na n goed getoetste kombinasie. Daar is baie prop enjin kombinasies maar die goed
word nie weekliks of genoeg gevlieg om regte werkverigting en duursaamheid te kan bevestig nie.
Hierdie is die eerste nie komersiele ( Rotax of Jabiru ) kombinasie wat ek ken wat nou al deur en deur
getoets is en betroubare inligting vanaf verkry kan word.
As jy inligting het plaas asseblief

groete

Johan
NAMIBIA FLYING COUNTRY
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Re: GK 1 ZU BLJ is flying

Unread post by Neville Ferreira » Mon Apr 26, 2021 5:53 pm

Johan Swakopmund wrote:
Mon Apr 26, 2021 12:32 pm
Neville
Het jy al voorheen die enjin en prop spesifikasies geplaas.
Byvoorbeeld wat is die aan die enjin gedoen / petrol inpsuiting , is dit elektroniese onsteking of het dit n Magneto
een of twee plugs per silinder.
Wat is die reduction na die prop en wat se prop het jy op. Wat is die reduction ratio.
Hierdie lyk na n goed getoetste kombinasie. Daar is baie prop enjin kombinasies maar die goed
word nie weekliks of genoeg gevlieg om regte werkverigting en duursaamheid te kan bevestig nie.
Hierdie is die eerste nie komersiele ( Rotax of Jabiru ) kombinasie wat ek ken wat nou al deur en deur
getoets is en betroubare inligting vanaf verkry kan word.
As jy inligting het plaas asseblief

groete

Johan

Johan

Single plug ignition. 2 ignition systems, one is the Honda CB 750 bike ignition and second is Spitronics.

I use the old for start and backup and after start switch to electronic ignition. Both share the same coil pack. As there is no starter I have to prop swing hence the reason why the electronic ignition cannot be used for start as it requires 360 deg to know where it is. On the cam pulley is a sensor with 36-1 tooth gear.

Zenith CD175 carburettor instead of fuel ignition for space saving.

The belt drive is a 100mm wide reduction drive with 2.29:1 ratio.

At the moment I am investigating a prop upgrade as the original prop is for sub 100 knot aircraft and almost 30 years old.

AX sport constant speed prop most likely to be the choice with a 20mph expected gain In cruise speed.
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