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This 3D printing lark is catching.

 

Following the success of my last model I have just completed my next!

 

F4D Skyray

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I have also chosen my next print! A twin!! You will have to wait to see which one.

 

For those interested.

Total print time: 39.30hrs

Total filament 467.1g

 

A reel of Overture AIR PLA contains 800g of filament which costs £19.99

 

You can do the maths.

 

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Don't normally do this but I was incredibly lucky to be gifted this glider as a kit.

It is an Andreas sold by Hyperflight.co.uk.

 

Still trying to get it tuned in but it is getting better each time.

andreas.jpg

Edited by Andy Gates
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22 minutes ago, GrumpyGnome said:

Smart. Is it painted, or printed in different coloured filament sections?

The forward fuselage and wing root sections are white PLA, and the rest of the fus, and wing and tail sections are ColorFabb natural colour LW-PLA. The wheels are 3D printed from black TPU. It’s painted with Kobra spray acrylic, which required a LOT of masking tape!

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Kevin

 

Where did you purchase, find or did you design the files yourself. If self design, on which design tool and slicer did you use.

 

I recently saw and handled a 3d printed model using one of the specialist PLA materials, it was or is quite a bit flimsy than my models, however am impressed by yours (and the one I have handled).

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2 hours ago, Erfolg said:

Kevin

 

Where did you purchase, find or did you design the files yourself. If self design, on which design tool and slicer did you use.

 

I recently saw and handled a 3d printed model using one of the specialist PLA materials, it was or is quite a bit flimsy than my models, however am impressed by yours (and the one I have handled).

My 3D skills only run to basic components, nothing too fancy.

 

The files for this model cost a paltry £10.22 from Cults. https://cults3d.com/en/3d-model/gadget/f4d-skyray-50mm-edf-jet

My slicer of choice is Orca slicer or Bambu Studio, my printer is a Bambu P1S.

 

This model was designed to use a single wall structure which would account for the "flimsy" feel. I generally tend to run 2 walls for most components only using single walls where weight saving would be an advantage. My EDF of choice was smaller than the model was designed for so a shroud was printed for it. Standard PLA weighed in at 14.2g the LW PLA only 6.5g. Even with the extra weight I will have a better than 1:1 thrust on this.

Edited by Kevin Fairgrieve
poor spelling
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OK so here is my first attempt at a scale warbird- dont look to closely - made a few mistakes. Its the 1/6th Bf109E kit from Cambrian models and now awaits some taxi trials before some good weather and its maiden. I've got no idea of its ground handling on our grass strip with this undercarriage configuration, so I'm just trying to reduce any potential ground issues before flight/landing. Perhaps someone can also point me to a proper scale 109E spinner which is proving troublesome to find.

For those interested its powered by 2* 4S3700 Lipo, and 5065/08 320 KV Tornado Thumper V3, APCe 16*10, total weight is 4.6Kgs. Power on my Wattmeter at FT is 1580 Watts.

 

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Sehr Gut Redex! You've made a lovely job of that Emil.

 

If you have access to a 3D Printer, Tom Hunt has made a very nice job of a scale 3-bladed spinner for the Brian Taylor  Bf109E, free to download on THingiverse.

 

https://www.thingiverse.com/thing:6147195

 

There are also files for two and three bladed versions.

 

https://www.thingiverse.com/thing:2776123

 

 

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7 minutes ago, Geoff S said:

It looks great to me but I'm no full-size expert/rivet counter 🙂  I assume the 4S LiPos are in parallel?

I'd imagine for a model of 4.5KG that they would be in series for an 8s1p set up Geoff.

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Hi All, yes lipos are in series using the usual series wiring adapter. If all goes ok I  will probably go to a bigger capacity after the maiden for a longer flight time. Not sure of the impact on the LiPo’s of the electric retracts yet - thanks for the links I’ll have a look. I would like to eventually go to a 3 blader as it looks more realistic. 

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I flew mine on a 5055,/06 580kv with a 5s 5000. It did not have flaps,  not sure of the weight but it was under 4kg. It has electric retracts and ground handling was OK, the batteries were getting old and flight times were about 6 to 8 minutes. I decided to fit a 15cc petrol engine in  and it worked fine apart from the noise. It was built from a very old die cut  kit, the veneer on one of the wings is lifting, and at the moment they are out of stock . It needs a refurbishment and I may go back to electric power as after 50 years without complaints of noise someone has moved into a house quarter of a mile away and is complaining of the noise of  the ic engines.

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8 hours ago, Redex said:

 

For those interested its powered by 2* 4S3700 Lipo, and 5065/08 320 KV Tornado Thumper V3, APCe 16*10, total weight is 4.6Kgs. Power on my Wattmeter at FT is 1580 Watts.

Redex, I'm assuming that the power reading was taken on the ground since you have yet to fly the aircraft.  I note the motor is rated at 1,600 watts so 1,580 sounds a good place to be till you get airborne.  That's when the prop load reduces and you will then be lucky to get more than 1,343 watts at best and probably nearer 1,264 watts.  My experience with a motor rated at 2,800 W on a 10S pack was that in the air the maximum I usually saw on my telemetry max reading was 2,750 with one example of 2,850 when I tried a full bore vertical climb soon after take off with a fresh pack.  On the ground, the same setup pulled 3,600 W for a very short period after opening the throttle fully.  I can tell you I closed that throttle pdq.

 

That is 28.5% more on the ground than I got in the air.  The power in the air is what matters not the max power in the artificial case of a restrained model on the ground.  IC engines are different from electric in that respect.  For the same reason, I will not do a full power noise check on my set up as I will burn up the motor if not the ESC.  I use a small highly capable on-board telemetry device that just fits between the ESC and power pack and can be made to talk to most if not all radio brands.  This will give you instant or max/min readings for V, A, W, rpm, height and a few other things.  It weighs less than 20 g and I always use it when first setting up an electric motor powered model.  Whilst it costs around Euro 70 plus shipping, it can be moved from model to model.  That way, I can be sure that I am getting maximum performance without over stressing the motor/ESC in the air.  Just thought I'd mention my findings in case you felt the aircraft was a bit under powered in flight.

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Thanks for the valuable info Peter, That is certainly something to really think about before the maiden - yes the reading was taken on the ground.

Thanks for the telemetry device link - it looks very useful which I shall have a look at.

 

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Third session with my first edf and it finally clicked, four great flights. It was quite breezy however the model cuts through the wind, flies very smooth and glides in predictably for landing.

 

Very happy with it. 👍

 

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Maiden flight for this yesterday; Richard Wills' original P51B, as featured on his website. I acquired this in the great 'moving house, do you need any of this stuff' sale. It was part way through a repair, and seemed too good to bin. It's been in my garage for a couple of years. The original foam wing was toast, and went in the bin. It was also configured for IC.

 

I built a wing from foamboard with B&Q 6mm pine spars, covered in glass cloth applied with B&Q water based varnish. the refurbished fuselage is covered in PVA/ brown paper, in usual WR style. The whole lot is painted in Valspar emulsion, matched (not too well) to a strip of the original painted covering.

 

As yet, I've not added any detailing. That's because I'm off work this week, and the weather was great yesterday. 

 

Power is a 4250 540kv motor turning a 14x10 on 4S packs. Don't know about the weight; not light. Around 5lb at a guess. I made no effort to keep it as light as my usual foamboard constructions as I want a model to handle a breeze.

 

No wheels, it's a fling & flop model. The radiator gives a reasonable grip, if a tiny bit too rearward to be really comfortable. So I made a dolly... It needs bigger wheels to cope with our strip, but works OK.

 

Maiden was uneventful in the extreme; she didn't appear to have enough groundspeed on the dolly, but just as I was considering aborting, she rose gracefully and climbed out flat and level. Apart from a bit of right rudder, no trim was needed...

 

Graham

 

 

mustang 170624.jpg

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What a lucky chap am I.

 

A good friend of mine has decided to sell his Tangent Kult Elektro 3.4m as shown in the pics. I asked if I could fly it before he lets it go and he told me I could fly it during the summer as he's in no hurry to sell it which I think is a great gesture. However, if I like how it flies I might end up buying it from him anyway as he only wants 500 euros for it which I think is an absolute bargain. I'll never be in the position of buying something like it new.

 

 

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Took advantage of yesterday evening's benign conditions to maiden this 25" Adrian Britton Hurricane, built from an old RC Scale free plan (published circa 2001).

 

Construction is balsa and doped tissue.  Minor mods include a demountable wing, individual servos for each aileron, and rudder control - otherwise, it's pretty much as Adrian B intended, including the brushed 400 can motor.  A 280mah 2S Lipo gives 2mins 30secs of flying time to storage voltage: not much, but the the Hurricane is small, fast and (for me) challenging to fly....so it's OK.  Fortunately, the small batteries are inexpensive and easy to change.

 

In the air, it looks good, but it certainly has its fair share of handling flaws; notably sensitivity  in roll, a sharp pitch up when the throttle is closed (less so vice-versa), and a nasty stall if up-elevator is applied at a rate commensurate with entering a normal loop. Hopefully I'll be able to iron these out.  Fortunately, its power-off glide is floaty and it's easy to land. 

 

If I were to build it again, I'd not bother with the rudder, use the extra space for a larger lipo, and use colour scheme that differentiates between the top and the underside.  I opted for the silver colour scheme because I thought it looked good, and I had a few spare sheets of silver-coloured tissue. 

 


 

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Thank you Leccy.  

 

Now that I know it flies I'll add the remaining detail.  Back in 2004, I built Adrian's 27" Spitfire from the QEFI plan.  With a 7-cell NiMh pack forced into it, the model seemed seriously underpowered and it felt like a lump of lead.  I never had the courage to fly it and it hung from the garage roof for 15 years.   

 

In 2019, I fitted it with a 280mah 2-cell Lipo pack and went for a much-delayed maiden.  Amazingly, it flew beautifully first time with no adjustment (that's never happened to me before or since).   Yes, it's small, fast and difficult to hand-launch but it's delightful to fly and much more benign than the Hurricane - which surprises me.

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