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Kwik Fli 40

Plans and discussion

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McG 696927/12/2016 19:31:34
1214 forum posts
552 photos

Quite an achievement in just a few weeks, Martyn.

Really well done.



john stones 127/12/2016 19:53:42
7592 forum posts
1230 photos

Very good Martyn, pleased all went well for you, though never doubted it yes


Lucas Hofman27/12/2016 21:26:35
303 forum posts
169 photos

Congrats Martyn,

It is always a great feeling when many hours building lead to a successful first flight!


Martyn K28/12/2016 10:02:10
4027 forum posts
2736 photos

Thanks all

I was pretty comfortable with these two. They are quite a simple re-scale of a proven original. Any disasters would have been of my creation.

I ordered a couple of new props last night - an 11x8.5 and an 11x10 for the IV. Hopefully they will make it a bit more lively. Its not massively out but it will get better. As its is at the moment it would make an excellent Aileron and Aerobatic Trainer.

Ideally, the elevator and aileron horns need to be bigger than the ones that I made - I'll revise the plans accordingly and may get them out later this week. I cant change my aileron horns as they are built in so I'll have to play with the servo horns. I realy wish that servo manufacturers would provide a reduced travel = higher torque servos - 45deg each way would be more than enough for most of my models

That's basically it though.

Any changes, I'll update here


minty morton29/12/2016 08:40:57
79 forum posts

Very very well done Martyn. Looking forward to seeing them next year.


Martyn K11/01/2017 13:58:52
4027 forum posts
2736 photos

Hi all

Kwik Fli 4-40 Plans now available for download (as a zip file).


Laser cut parts can be ordered from Dylan at LaserCraft. PM him from this website please

(Edit - Laser cut parts are Wing ribs, Fuselage ply formers and Wing ply parts - not ply fuselage doublers)

Dylan Reynolds LaserCraft Services

DXF files are available on request

KF3-40 plans to follow soon.

Best wishes




Edited By Martyn K on 11/01/2017 14:04:06

Braddock, VC11/01/2017 17:43:49
1251 forum posts
16 photos

Martyn, a quick query. I looked at the ic fuselage and see you "used" an OS 35AX and fitted the slec 9 ounce tank.

Is that tank a bit on the large size, I ask because I'm using an Irvine 36 in a wot 4 which would seem to be a similar source of drag etc and had 3, 5 minute flights [fingers get cold this time of year] with a third of a tank left from the slec 6 ounce tank.

I have another irv 36 and thought about building a kwik-fli around that.

Martyn K11/01/2017 18:28:28
4027 forum posts
2736 photos

Very good point. I had no experience of the 35AX before this model was unsure just how big a tank I needed. As it stands and without the engine being fully run in it will give a comfortable 15mins flight time.

You could comfortably drop down a tank size if you wished. I certainly would if I did it again. I wish my OS61RV was that economical - even pro rata

Martyn K13/01/2017 10:02:03
4027 forum posts
2736 photos

Apologies all. Just realised that the cut parts drawings were missing from the original zipped plans set I linked to above

Try this Set

Kwik Fli IV - 40 Plans v2a ZIP





Edited By Martyn K on 13/01/2017 10:03:27

Braddock, VC13/01/2017 10:22:32
1251 forum posts
16 photos

Thanks, martyn. I run my 36s on 15% nitro so I guess if I dropped down to 5 or 10% the fuel would go even further.

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