Cozy - cvh

Covering home built aircraft using the canard design

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Unread post by Pete » Sat Mar 24, 2007 10:04 am

Hey CVH... have you checked out these two chicks that are building a Cozy MK-IV and even making some custom parts. 8)

Dont know if they make vibrator bits aswell :twisted: :twisted:

Look at http://www.cozygirrrl.com (and no it is not a porn site) :oops:
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Unread post by cvh: » Mon Jun 04, 2007 9:41 am

Results of my Test Flight 21

Reasonably nice winters day the field, 16C (62F) & wind about 10 knots 90 degree to the runway (from the North, so its smooth over some field)
To recap we have a tar 1000 m (about 3300') runway 13 / 31

The original idea was to test forward C of G limit.

So I thought I was a little brave for the day and loaded 75 Kg on the
passenger seat, while moving the ballast from the nose to the rear. This
brought my C of G to 97.43 on a total weight of 1858 lb.

So far, so good. Motor started fine & everything checked out OK.

Enter runway 13, not my favourite, it climbs ever so gently with a slightly
steeper bit in the middle... As usual "Suptel Blue" was quick off the mark
and we reached 55 Knots on about the 300 m mark, but then the acceleration petered out some (runway rise) and it seemed stuck at 65 Knots.

Two items got me on the way here. The effect that a 90 degree Xwind has is undoubtedly more than in a conventional plane. I tried rudder only but that was not enough, so I needed to pat the brake on the downwind side to keep the show on the runway. This lengthens the amount of runway needed. The slight rise in the runway never instils confidence and lengthens this too. The fact that there was no help from any headwind was new to me in this
plane.

By now were almost at my decision point. I pulled the control and it showed a feeble attempt at flight, so at the decision point 600 m (2000') I cut the whole show down to a maximum stopping action and got it to fast taxi with just under 100 m to spare.

That then took care of my braveness and I parked & went home. Enough
excitement for one Sunday.

Just thought I'd keep you all in the picture.

PS. do remember that this plane takes off smartly with two people on board ... ref initial test flights, but that was with a slight headwind and on the "downhill" runway.

Regards

Chris Van Hoof - Architect - Johannesburg
ZU-CZZ / Cozy Mk IV / latest info on:
http://mysite.mweb.co.za/residents/cvh/index.htm
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Unread post by cvh: » Mon Jun 04, 2007 9:52 am

Hey Etienne, Thanks for the photos, I only saw these today!
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Unread post by cvh:. » Mon Jul 16, 2007 3:08 pm

OK, some photos for those that care ...

Did my Gross testing this Weekend.

one photo shows the cockpit with IAS @ 100 Kts while reaching 10,000' from 6000'. Motor not leaned at this stage, settings kept as at start of climb.

Second shows the angle outside.

Vacum regulator packed up, hence AH & DI toppled.
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Last edited by cvh:. on Sat Jun 14, 2008 9:37 pm, edited 2 times in total.
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Unread post by cvh:. » Mon Jul 16, 2007 3:10 pm

second photo of the inside
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Unread post by cvh:. » Tue Aug 07, 2007 8:51 am

For those of you wanting to see a Cozy fly & land, follow the link:
http://www.cozybuilders.org/Oshkosh_Presentations/

here you will find a 7 minute video.
This plane is fitted with a 540 motor.
You will also see it climb doing 150 mph going thru 18K'

enjoy
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#4501

Unread post by cvh. » Sun May 18, 2008 5:47 pm

Hi folks,

Just for those with interest in a climb test of my Cozy.

Today we attempted to do a climbtest, which is a normal requirement for new
planes. Our CAA expects one to do this until climb performance has
deteriorated to 50'/min (fifty/minute)

So we set of and started at 7500' w temp at 12C. The speed was nailed at 100
knots indicated w 2200 rpm.
We abandoned the test at 19500' on standard setting Outside Temp now -3,5C I
don't need oxygen as much as I need a blanket :-)

Anyway, the interesting bit of news is that at that point it still climbs at
300 feet / minute ... there seems to be no end to the beauty of this
machine.

Tests are of course inconclusive, because we did not reach the actual
50'/min required.

I'll have to take an IF rated body along for that ... tough here in Africa
:-)

Will let you all know the outcome of the next test.

And yes, we have oxygen :-)

Regards
2008_0518_105423.JPG
2008_0518_105646.JPG
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Re: Cozy - cvh

Unread post by Ugly Duckling » Mon May 19, 2008 7:56 am

Nice write-up Chris. Seems that Cozy would dissapear into the Subtle Blue at 30000'. :D
Paul Sabatier EAA Ch 575, SSSA, ERGC, ERFC, AeroClub
Long time Cygnet builder
The object is to fly, it does not matter what the object is!
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#4502

Unread post by cvh. » Mon May 19, 2008 8:29 am

Don't know about that height, but I do think 23500 may be the max ... :-)

Now who to speak to to let a VFR Pilot go higher?

Any ideas?
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#4507

Unread post by cvh: » Mon May 19, 2008 2:09 pm

For those interested, here is a graph with the relevant data, from 7500 to 19500
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Re: Cozy - cvh

Unread post by RV » Mon May 19, 2008 10:35 pm

Jeez Chris, that is one impressive aircraft, 200 fpm at 19500, WOW
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#4515

Unread post by cvh:. » Tue May 20, 2008 12:23 pm

Thanks RV :D I am enjoying it :D :D

Think it could possibly make 23500 ... but rules is rules :D
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#4755

Unread post by cvh:. » Sat Jun 14, 2008 10:08 pm

So, while we are waiting for our approval to go past 19500' we found other stuff to test.... :D

Anyway, at present I am turning a P-Prop 70' x 80", which is all very nice, but how do you actually know when you have the perfect prop?

Well, you could have several made up, or you could borrow, which is what I did.

Jannie Versfeld (he's the one with the Cozy w O-540) is turning a Catto 66" x 88" and I always wondered how course I could go ... wonder no more, he lent me his spare prop!

So I decided on a minimum static (2000rpm) and if that was attained (or very close), we'd do a trial run, with a predermined go/abort point (500m at BaraG on 31, 13 was not to be used for this type test!)

Today I fitted this black monster to my Cozy and tried it out - Wowie!

Static turned out at 1950 (close enough!) and after some soulsearching I decided that I'd take it to the runway to see how quickly she'll unwind.

At the 500m marker we were already airborne and accellerating, not quite as chipper as I had gotten used to with the other prop, but this promised to be a quick run. At the end of the runway we were turning 2100 rpm with a positive climb out at 90 KIAS.

Goodie, I let it climb from 5300 to 6500 and kept a racetrack pattern to the drome. by the first downwind we were indicating 150 KIAs , the rpm looked like they were increasing steadily, and on the pass over the runway it was doing 165 KIAS with the RPM at 2400 and still increasing. On the second downwind the gauge started giving trouble and since the motor was turning smoothly, I figured that it is the pick-up point or the gauge, so I called it a day ... things only get worse and this was as good as it was going to get.

Thus I killed the power and tried to get it to slow down for a landing ... no way could I get it to less than 120 KIAS, so yet another flight with the by now customary go-around. Second attempt was perfect with the figures nailed at 90 Downwind, 90 base, turn final, cut to 80, pull brake, slow down some more and 70 over the numbers, touch down at 60 KIAS.

Turns out the wiring had come adrift at the pick-up point to the motor.

All and all an exciting episode.

Tomorrow we'll try again, this time with the RPM gauge working ;-)

Conditions ... 20C, no wind to speak of, 1028 Hpa. Runway 31 in use.
1/2 tanks, me alone @ 206 lb and ballast in the nose.

It appears that this prop may be a little coarse and my next one may be 70" x 84" which will allow me to take off on gross at this field (FASY)

Just thought I'd share my fun!
Last edited by cvh:. on Tue Feb 09, 2010 10:34 am, edited 1 time in total.
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Re: Cozy - cvh

Unread post by Ugly Duckling » Fri Jul 25, 2008 8:00 am

EAAER ARRIVES FROM ISRAEL
After beginning his flight from Tel Aviv, Israel, to EAA AirVenture Oshkosh on July 7, Yair Gil, EAA 703228, landed Wednesday in his Cozy MK-IV in Oshkosh, Wisconsin. The homebuilder landed in Iqaluit, Nunavut, Canada, on July 18, continued his journey to Aéroport La Grande Riviére in Radisson, Quebec, Canada, and finally landed in the United States.
http://www.mmsend2.com/ls.cfm?tid=22542 ... 2_gil.html

CVH that Cozy has loooong legs. What's this Lichtenberg & back stuff. Let her go man. =D>
Paul Sabatier EAA Ch 575, SSSA, ERGC, ERFC, AeroClub
Long time Cygnet builder
The object is to fly, it does not matter what the object is!
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#5080

Unread post by cvh » Fri Jul 25, 2008 11:03 am

That Yair Gil feller is an accomplished and capable pilot!

He's been on Israeli TV a few times and won some competitions in his Cozy, including a spot landing stint!

With all that he managed to land with the nosewheel up in Scotland, no real damage, so he carried on to the USA. ... so, stuff happens!

Anyway, my climb test is scheduled for tomorrow, 10:00 to 12:00 Z, around Lichtenburg :)

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