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Author Topic: Kit Scale 2019 Models  (Read 10590 times)
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Jack Plane
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« Reply #200 on: March 04, 2019, 02:06:44 AM »


I have an untrimmed Jodel waiting so you may have motivated me to get going.

Ricky

Go Ricky!  Any pics?
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Jack Plane
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« Reply #201 on: March 06, 2019, 02:44:47 PM »

The difference eighteen months makes...

He's now determined to do it all on his own - not that I previously did anything more than guide him, just that he now wants ownership of the whole process, planning, making and all.

 Cheesy

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« Reply #202 on: March 06, 2019, 03:19:10 PM »

Great stuff .... get 'em 'ooked!
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TheLurker
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« Reply #203 on: March 06, 2019, 03:33:32 PM »

Good to see No. 1 Apprentice back at the bench.  Pass on my regards.
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DHnut
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« Reply #204 on: March 07, 2019, 03:53:46 PM »

The photo of the Jodel is attached. It is still awaiting outddor trimming. I tried some initial flights at our indoor hall and decided it was a bit risky. I just need a little less wind. The weight is 21 grams including rubber, and the noseblock is held in with magnets.
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Pete Fardell
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« Reply #205 on: March 07, 2019, 05:55:10 PM »

Looking very nice in the sunlight, Ricky. 21g sounds alright too.
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OZPAF
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« Reply #206 on: March 07, 2019, 06:19:04 PM »

Excellent work on your apprentice Jack. Ricky's nice shot of his model in the sun should be an inspiration.

John
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danmellor
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« Reply #207 on: March 07, 2019, 07:38:27 PM »

My Jodel has been stuck in it's box for around 3 years. I keep forgetting about it! I must take it to the next Alfreton bash and finally get it trimmed. All I have to do is try and remember what it was doing last time out...

Lovely little design and some nice finished (And being finished!) examples on here!

Cheers,

Dan.
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DHnut
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« Reply #208 on: March 07, 2019, 10:12:33 PM »

Dan,
        I can empathise with that sentiment. Look forward to hearing how it goes.  I have finall resorted to a log book of sorts when I remember to note things down. It certainly helps on rubber size as I like to strip a variety of sizes and maintain an even number of strands for braiding if needed. By the way the heavens have opened after about 6 weeks without rain but a nice summer.
 Ricky
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Jack Plane
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« Reply #209 on: March 08, 2019, 02:35:57 AM »

Ricky, very nice Jodel and excellent weight for VMC model! Nice sunshine too!

We've got a westerly airflow over the British Isles - the sort that parks itself and doesn't move for a long time - but its still late winter, the earth needs the rain, deadwood needs blowing down, and I'm on a work deadline so can do without any excuses to skive off for outdoor trimming or slope soaring!
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Jack Plane
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« Reply #210 on: April 21, 2019, 03:45:53 PM »

A jolly intense week guiding the Kid (organising, demonstrating, cajoling, bollocking, hugging, encouraging, giving lots of breaks) to complete his VMC Jodel in time to maiden in today's superb trimming weather - the pressure was on as tomorrow onwards forecast to be meteorological business as usual.

Making started in Summer 2017 when he got bones made, but was then put away and he only got going again a few weeks' ago when he decided he was going to have a go at the Nats!  Shocked

Footage here of one of the early trim flights on 3/16" rubber (185 thou) 1.5 x hook to peg: https://photos.app.goo.gl/iBgL623jfjG5L3zy6

550 turns (50% of max/break) will do 15secs from hand-launch, but this feels slightly too aggressive and really think we ought to prepare a similar length of 160 thou for the Indoor Nats next weekend.

Weighs in at about 35g (27.5 airframe + 3.5 rubber + 5 nose-lead), a loading of about 0.56g/sq in so not too bad for a big indoor space...?

Jon

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Jack Plane
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« Reply #211 on: April 21, 2019, 04:05:57 PM »

He really wanted to do a good job - including moulding a balsa cowling! - all with a broken arm courtesy of the school ski trip  Shocked

We doped in the back of the car with all the doors open and a breeze blowing.

The pilot is his dog (at his mum's house)!  Grin
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TheLurker
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« Reply #212 on: April 21, 2019, 04:28:41 PM »

Flies better than anything I've ever built.  Well done to the No. 1 Apprentice.
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DHnut
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« Reply #213 on: April 21, 2019, 06:41:57 PM »

The Jodel also looks promising as well. I am using .130" for the initial trim flights and it looks promising with a total weight of 21.5 gm but may need a little more . I have also had to add weight to get the CG right. There was a need to get a warp out of the cetre section, now done. We have just had a magic morning yesterday with no wind flying Cloud Tramps.
Ricky
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Pete Fardell
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« Reply #214 on: April 21, 2019, 06:56:55 PM »

Very fine effort indeed! Looking forward to seeing it in action.
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Andrew Darby
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« Reply #215 on: April 22, 2019, 06:29:20 AM »

Boy done good!  Grin

Andrew
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Jack Plane
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« Reply #216 on: April 22, 2019, 08:28:13 AM »

Thanks guys - I'll pass on your comments!  Smiley

Made a new motor from 165 thou as the 185 seemed a bit too aggressive, and managed to get out early this morning for brief tests before the wind piped up.  Gentler flights but still a reasonable initial climb etc on 65% of max/breakage turns.  Needed to reduce right-thrust (was 3ยบ previously) to compensate and keep the circle respectable, and also needed to assert a tad more down-thrust.  Gentle gliding turn seems fine and model appears to have reasonable enough longitudinal stability.

We'd glued the rudder on with a very slight left angle, but the model needs a proper card tab to nail the turn.  A gurney along the underside TE of the left tip plus another one the same length just inboard of this seemed to do the trick of keeping the inner wing up.

Had to curtail the session when the breeze established itself more fully (those upturned tips really catch the wind!) but I think we're good with the 165 and we can finalise trims and hopefully put it all together indoors at Walsall next Saturday afternoon!
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« Reply #217 on: April 22, 2019, 09:39:10 PM »

Your apprentice has done a great job on the Jodel Jack and it flies well. You've done a good job training him - well done.

John
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