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carbon fin vs balsa weight


tomc
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Hi

I keep creasing the fin on my mini dart DLG, mainly cos I cant catch it every time and the field I fly in is very short grass and very hard. I have fixed it a few times but it is now just getting heavier.

If I made a balsa fin, either with our without glass skin and carbon spar, as I can make these very cheaply, anyone got any idea how much heavier it would be compared to a the current carbon foam one? The carbon one is 3grams

Thanks

Tom

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For a smaller model like yours, I’m sure it will be fine.  But you are unlikely to make a balsa one as light and strong as a carbon one. 
 

How's the damage caused? Is it vertical load from the fun hitting the ground or side ways load on the fin?

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sideways load from me not getting all the landings smooth and in a straight line. I have a field 1 min walk away I can fly in, so have been getting out at least once a day while the weather is nice to try and up my skills, so my landings are getting better, but I still cant nail it every time.

I think if I made some balsa ones with maybe a carbon sparthen I could almost consider them as expendable until I have improved my landings. O I was wondering about a super thin ply one that might have some flex?

 

tom

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It is important to land as directly in to wind as you can. That is one reason I have a rod with a piece of string attached to my TX. Easy to see wind direction, no need to suck my finger and hold it up 😁.   Landing cross wind is asking for trouble.  Better to land down wind than attempt low turn and end up skidding sideways and breaking the fin. 

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yes, I understand the theory, its just putting it into practise that is problem.  I try and have a plan, but if the launch is not as good as I hoped or I have a few stalls the model does not always comply. A bigger field would help, but the one I use is 30 seconds walk from my back door, so its dead easy to watch the wind and pop out just when its super calm.

 

Tom

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  • 4 months later...

Hi

I upgraded to a stream nxt, which I find so much easier to fly, can now catch it at least 50% of the time, and in not catching, the landings are much more controlled.

Thanks

Tom

 

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