Hami21 Show full post »
solentlife
Very nice .... 

Its nice to see construction take place instead of just adding CF as well ... the use of skins on foam spars and the addition of the paper as surface ... gives good strength spread through the form.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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Wildthing
That's a big bird. It's coming along really great, what is the power setup you putting into it? 
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solentlife
Impressed .... 

In the video - the comment of needing more power comes up .. and even with 10x5 ... comment that more power needed. Also the lack of roll rate ... This brings me back to tractor mounted prop instead of pusher.

I wonder if both can be improved by sticking the prop up front ? I have converted a few such as Schumates F15 to tractor and the difference is significant. I could use smaller prop and actually dialed down surface movements.

Just saying ... as the build shown here is superb ... 
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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mastermalpass086
That is one curvy build! And real light weight for its size. How do you go about using the hair dryer (I have an actual heat gun, if that's better) technique? I experimented with foam bending for a little project I've been working on:

[VWc5JZZ] 

And I've been purely using the 'bend it round the edge of the table, bit by bit' technique. I found the wider the piece of foam you wanted to bend along, the harder it was to bend without snapping it. The half pipe you see above was initially cut with an extra couple of inches on each edge which I cut off after bending, as when trying to bend one with only the amount of foam needed for the piece itself, I snapped it.

Do I heat up along the line I want to bend on, then take off the heat and bend it around the edge, then heat up the next section, or... ? The ability to form foam the way you have could really simplify some future projects I have in mind. 🙂
BRB - Building another nosecone.
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solentlife
Guy in Liepaja built this in Depron and even the cowl is cold formed over a roll edge kitchen worktop :

[IMG0089A]

[IMG0077A]


His build skills were superb ... there is no CF in that anywhere ... the strength comes from the structure itself.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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mastermalpass086
solentlife wrote:
Guy in Liepaja built this in Depron and even the cowl is cold formed over a roll edge kitchen worktop.


Of course! I never considered the round edge of a kitchen work top! There'd be much less risk of snapping the foam that way, as well. 🙂
BRB - Building another nosecone.
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solentlife


Of course! I never considered the round edge of a kitchen work top! There'd be much lest risk of snapping the foam that way, as well. 🙂


First time I met him ... I didn't know you could do it .... he took a piece of depron and worked it ... slowly slowly never forcing it ... eventually had it form a ring round a smallish paint tin ... 

You can of course use painters tape or stronger to help reduce risk of cracking the sheet as you work it ...  

Here's something I did a while back ... its a bit dusty now - but was showing another guy who visited ... I know its only 3mm .... but still ... 

Depron rolled.jpg 
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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Wildthing


Of course! I never considered the round edge of a kitchen work top! There'd be much less risk of snapping the foam that way, as well. 🙂

I have used a rolling pin on the inside and with some force crush it slightly and as you roll over bend it with the rolling pin. With grey 6mm Depron I did a 70mm tube. 
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solentlife
I wish to apologise to OP if anyone thinks I'm knocking or trying to influence build ... no way - I have admiration for the F4 build and techniques shown ..

I was just adding to the discussion .. 
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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Hami21
Wildthing wrote:
That's a big bird. It's coming along really great, what is the power setup you putting into it? 


Hello my friend sorry for delay on my answer...i had serious problems lately and consumed most of my time...for this set up i have this motor 1000kv or lower 800kv etc...40A esc 2200mah 3s or 4s dependence on the motor and prop higher than 1045 by 3 or at least 1060 prop for maximum power! 
For a round edge you can heat a little bit the foam and in a kitchen work top you can shape your foam as you want! here is the reasult painted and the maiden flight here as well 
85015024_493351304716250_3173924000736739328_n.jpg  85036376_503125463673111_2575349445373722624_n.jpg  85206306_488181878800458_2568568061380526080_n.jpg  86232598_2412486225524495_4865662656003964928_n.jpg  86250252_178113146850854_9157278060741918720_n.jpg  86277759_123367235717718_2533579471080914944_n.jpg  86354863_197141874988115_2212020887446618112_n.jpg 




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solentlife
Lovely model but I was clenched teeth watching .... it really needs more power ..... 

You showed skill to keep her flying ....... as there appeared no margin of power / error ... 
I'll fly anything if I can launch it ! Youtube : solentlifeuk
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JTiger
Yeah, it does look a little under powered. Nice maiden though
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Wildthing
Hami21 wrote:


Hello my friend sorry for delay on my answer...i had serious problems lately and consumed most of my time...for this set up i have this motor 1000kv or lower 800kv etc...40A esc 2200mah 3s or 4s dependence on the motor and prop higher than 1045 by 3 or at least 1060 prop for maximum power! 
For a round edge you can heat a little bit the foam and in a kitchen work top you can shape your foam as you want! here is the reasult painted and the maiden flight here as well 


              



Excellent build and love the detail work you did. 
I also think you need more power 🙂 
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mastermalpass086
Nice finish on the model, and a smooth maiden. I'm in agreement with the others about the power though - doesn't look like you'll be doing any aerobatics with that set up.

Might I recommend a four-bladed prop? I know this might demand lower KV motor and higher ESC, but I think a plane of that size is just going to demand more power. It may be light, but there's a lot more air for it to work through at its size.
BRB - Building another nosecone.
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Dodgy Crasher
Thanks for the tips on rolling Depron, thats gonna be big help in future builds.  ðŸ˜‰ðŸ‘
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