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New EDF Mini Jets- Jet Provost & Folland Gnat

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Martin McIntosh10/05/2020 12:17:30
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3409 forum posts
1202 photos

JR9, try r/c modeller`s glue for the canopy, it holds well and sets crystal clear. Secure with tape while it dries.

ken anderson.10/05/2020 12:40:24
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8681 forum posts
807 photos

hello Lucas, I've used the same connectors as you have over the years on various models and had no cause for concern. The small EDF's use small deflections of their control surfaces and as such I cant see any problems... ...

ken anderson...ne..1...connectors dept.

John Roberts 910/05/2020 14:21:47
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197 forum posts
175 photos

Hi Martin,

Thanks for the recommendation. I have a bottle of canopy glue in my stock and whilst I have found that it works well in some situations it can also be a bit messy, especially where the canopy isn't very rigid and/or where the fuselage has compound curves (like the gnat). Could be that I am just ham-fisted of course!

Just a few minutes ago I was looking at a piece of depron and wondering if I could use it to make a base for the canopy which would stiffen the whole thing up. Then again I am probably over-thinking and over-complicating.

brokenenglish10/05/2020 14:55:51
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568 forum posts
30 photos
Posted by Martin McIntosh on 10/05/2020 12:14:09:

other than back in the days of single channel when we used electrical terminals to connect the escapement to the rudder operating rod.

That's another thing I'm still doing! ... Oh dear!

Martin McIntosh10/05/2020 15:01:04
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3409 forum posts
1202 photos

I tried some so called canopy glue once on a Spit. Despite leaving for a long time to set, when I tried to wipe off the excess with a damp cloth the canopy fell off. Cannot remember the make. Another way is to use foam safe ca which will not cause it to bloom but is even more messy to use.

I would not bother with the Depron, the thing goes on quite well if trimmed correctly (I find cutting them daunting despite using curved nail scissors).

Mine now has the hand launch piece underneath which I was trying to get away with from fitting but just putting the model on the bench broke an aileron at a hinge so the horns have also been shortened and the throws reset.

Hoping that Bojo will set us free to fly again tonight.

Lucas Hofman10/05/2020 19:59:31
668 forum posts
375 photos

Oh dear, looks like I have started something which has ignited some members....

I must admit I only fly models with motors, not engines. Neither I.C. nor steam. And, with the risk of inflaming some, neather would any full size aircraft designer/builder have done if they would have had the option of vibration free, low maintenace and very reliable electric propulsion that we model aircraft operators have.

But back to the connectors. Low vibration makes a difference for the solution choosen. And a 600 gr. electric model is likely to have a different optimal solution compared to a 15 kg scale model with a 100 cc 2 cycle petrol engine.

Glued the canopy tonight. Now it is only covering left. 550 gr. including battery at this stage. I think she will be on or below the target weight of 620gr.

Lucas

Lucas Hofman12/05/2020 07:09:44
668 forum posts
375 photos

Does anyone know if there is a file somewhere with all the decals for the yellow version as described in the article? That would save quite a bit of work.

Lucas

Stephen Belshaw12/05/2020 09:13:25
108 forum posts
27 photos

A little late to the party but I've been building my Gnat on and off over the last couple of months in conjunction with following this thread and picking up some hints and tips.

img_0246.jpeg

I'll be finishing this in the yellow colour scheme, the only difficulty will be in sourcing the graphics. I've fitted magnets to the battery hatch and will shortly be cutting out the fan access hatch to allow me to connect the esc before tack gluing back in place. Looks like I'll be on target with the weight and hope she flies ok on my Zippy 25C 2200 pack.

I'm mostly only flying gliders so I'm expecting this to be an interesting experience!

Lucas Hofman13/05/2020 09:29:08
668 forum posts
375 photos

I did some testing with different batteries and found big differences between them. My 6 year old 25C Turnigy batteries delivered about 450 gr thrust. A new 45C Gensace 2300 mAh battery delivered 630 gr without battery hatch and 580 with the battery hatch closed.

Check yours on the scale. I put the plane nose down on the scale, hold it lightly and open the throttle. If you spin up the first time and have your face over the exhaust you get a lot of balsa dust in your face (do not ask how I know....)

ken anderson.13/05/2020 10:29:56
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8681 forum posts
807 photos

hello Stephen...have a look here for decals....I got some from them for my sabre....

ken anderson...ne..1.decal dept.

Jack Petrie14/05/2020 20:44:43
22 forum posts
13 photos

jet provost 2.jpg

Finally finished painting! Happy with how it has turned out. Got the canopy to glue on and final balancing then should be ready to fly for the weekend

Jack

Jack Petrie18/05/2020 19:12:09
22 forum posts
13 photos

jp 4.jpgjp 3.jpg

Had the maiden flight today! All was successful and happy to see the jet in the air for the first time

Lucas Hofman19/05/2020 06:50:33
668 forum posts
375 photos

Congratualations!

May I ask how you put the blue on the canopy. Is it self-adhesive vinyl or shrink film. If the latter, did you do anything special to avoid distorting the canopy?

Regards,

Lucas

Jack Petrie19/05/2020 11:14:55
22 forum posts
13 photos

Thanks Lucas.

It's actually just the same blue 2 pack paint that i used on the fuselage!

John Roberts 928/05/2020 17:17:58
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197 forum posts
175 photos

Finally finished my Folland Gnat. Took me rather longer to build than I expected but, on the other hand, I haven't had much else to do over the last few weeks!

Applying the covering was a bit of a fiddle but it doesn't look too bad as long as you don't look closely!

img_3383.jpg

img_3389.jpg

Scottish lockdown rules have just been relaxed so I hope to start flying again tomorrow but I shall give my rusty thumbs some exercise on my trusty Wot4 before trying to maiden the Gnat.

Edited By John Roberts 9 on 28/05/2020 17:18:27

Edited By John Roberts 9 on 28/05/2020 17:45:49

Colin Bernard28/05/2020 17:28:19
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502 forum posts
93 photos

Well my Provost is done now it's a case of waiting and thumb twiddling - SWMBO is in the high risk group so no going to the field yet

20200524_121558.jpg

Dickw28/05/2020 23:19:31
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713 forum posts
99 photos

I completed my Gnat just before the lockdown so have been waiting since then for the maiden flight. I am happy to report that the wait is now over and a successful maiden took place today. smiley

No problems encountered and great fun to fly. I spent a bit of time playing with rates during the flight and have now arrived at a setup which suits me. Loops and rolls were fine and the stall was just a gentle dip of the nose at a very slow speed.

No flying pics I am afraid, but a few interesting statistics based on the telemetry data log (SM UniSens on board). Power at launch was 630 watts (a 4s setup in use), but most of the flight was ar 250 watts or lower (see log extract below). The 5 minute flight used only 1200 mAh from the 2200 Lipo, so 7 or 8 minute flights should be no problem.

It has a real vertical performance, and one 138m climb in less than 10 secs showed a climb rate of 14.5 m/sec - not bad for such a little model.

I am very happy.

Dick

ps. I forgot to say how amazingly quiet it was in flight - something all the onlookers commented on!

gnat maiden.jpg2020-05-28 maiden flight w.jpg

Edited By Dickw on 28/05/2020 23:25:13

Lucas Hofman29/05/2020 07:08:03
668 forum posts
375 photos

Congratulations Dick!

May I ask you what settings you ended up with (mm up/down and expo)?

Lucas

Steve Jones 229/05/2020 10:29:38
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580 forum posts
423 photos

Hi Dick,

Lovely looking model and great news on the flight.. flew mine again last night and the Hunter.

The Gnat is still the one I like the best

Steve

Dickw29/05/2020 11:21:43
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713 forum posts
99 photos
Posted by Lucas Hofman on 29/05/2020 07:08:03:

Congratulations Dick!

May I ask you what settings you ended up with (mm up/down and expo)?

Lucas

Hi Lucas

I didn't use any expo at this stage as I wanted to just sort out some basic control throws.

I have just measured the final results and now have +/- 8mm on elevator. The ailerons have 2 rates with +/- 3mm giving a decent roll rate for normal flying and +/- 4mm giving very rapid rolls fort a bit of added fun.

I think my next step would be to have the ailerons permanently at +/- 4mm with some added expo. On my Tx 30% expo looks about right according to the displayed function curves, but that would probably depend on the Tx brand.

Dick

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