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any Flitetest planes under 250g

eagle4

New member
#1
Hey gang, What FT planes can be built to be under 250g? Just looking at building my next one and keeping it under 250g means i can fly it in Canada without restrictions.
I reckon the mighty mini series would be ok. but what about the FT Sparrow?
Have you guys weighed your planes?
 
#2
FWIW, my painted ready to fly FT Mini Scout weighs 109.8g with servos and control rods installed but WITHOUT power-pod/motor/prop, battery and receiver. I'm sure once those are added I will still be in under the 250g weight. I haven't maidened my scout yet but I am hoping to do so soon.

Good luck!
 
#5
I weighed my Sparrow with a 3s/800mah battery installed (9g servos), and all said and done it was around 265g. It could be built lighter with construction adhesive instead of hot melt glue, and I think there are some other places you could reduce weight. I don't think it would be out of the question to lose the 15-16 grams in order to get it under 250.

I build it with a removable power pod which I think reduces the weight a bit from the original design. I also build the bigger version which adds a bit if weight, so that might be a net loss of 0 grams.
 

Hai-Lee

Old and Bold RC PILOT
Mentor
#7
Removing paper where possible saves a lot of weight. The FB I use weighs only 40% of its original weight when all of the paper is removed.

Have fun!
 
#10
Building with White Gorilla Glue instead of Hot Glue saves a lot of weight as well.
Plus 1. I agree with rockyboy, using White Gorilla Glue saves weight. I only use hot glue in very small amounts when and where necessary.

I agree with eagle4 also, you would sacrifice strength and rigidity by removing the paper.
 
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Hai-Lee

Old and Bold RC PILOT
Mentor
#11
The problem with removing paper is it adds a ton of strength and rigidity and durability to the plane.
True! But the idea of the strength, and extra weight, where it is not required is what I was referring to.

I recent experiments I found that a thin layer of Balsa, (1mm), to one side of the paperless foam was lighter and stronger than the 2 layers of paper. (Posted on the forums)

As for durability I did a FT Spitfire without the paper, (but with Balsa), and whilst it has had a number of bad landings, (all my fault), it is still flying without repair. The same plane has shown no tendency to warp, crease, or delaminate over time. (Again posted on the forums - under mad scratch builders).

If chasing real weight savings then try building FT designs with Depron and thin balsa for structural strengthening and you could easily achieve 25%+ weight savings on the bare airframes.

What works for me!

Have fun!
 

mrjdstewart

Well-known member
#12
i have built 5 different FT mini Scouts and even the heaviest (the one i scratch built from plans) was still well below the 250g mark.

i believe in the he was 237g. with everything, including the lego guy. this was my first build and i used hot glue so i erred on the side of excess when glueing.

20170428_210125.jpg

the lightest, and most recent was just over 200g.

20170524_081812 (1).jpg

build can easily be done in a day if you know what you are doing.

laters,

jason ;)