nnChipmunk v2

[nerdnic]

Very nice! I say fly it

 

[shiitake]

I broke my v-stab in turbulent air in full flight. It happened right in front of me and I could hear it snap! The plane started to fly sideways. Just one meter from the ground it started to fly straight again and I could more or less land. No damage except for the v-stab!

Now looking at the design in hindsight it is easy to see the weak spot when you go 200% (because the surface gets 4 times as big while the diameter only gets 2 times and of course the thickness of the foamboard stays the same as the normal sized one).

What I made yellow is all that really holds the v-stab

Anyway.. after a bit of bamboo and some hotglue:

 

[nerdnic]

That could have been really bad, nice job getting her down safe. Did you just use two layers of foam, no extra support on the stab?

 

[shiitake]

Nop.. no extra support. My bad :black_eyed:

How do you like the picture by the way? I think she looks so good!

 

[nerdnic]

I think you did a great job man! The lines on the chip have been very appealing to me since i first saw it. It looks even better at the increased size. I still want to make a big one for myself

 

[BridgeInspector]

A few beauty shots








Maiden will have to wait until the rain stops, which doesn't look like this weekend.

I still need to decide on this smallish motor (2830 1000) or one of my bigger ones (3536 1800).

 

[nerdnic]

Great work on the build and paint! I would probably maiden with the more modest setup. Once she's dialed in them bump the power.

Good luck and keep us posted!

 

[brian79cj]

A couple shots of finished product
I just noticed that I put canopy on backwards. Oh well that's how I roll!

 

[nerdnic]

Haha you're not the only one! I'll have to make it more obvious next time

Great work on the build and paint! Will you be able to get any video?

 

[kevparang]

Wow that is a stable plane, I want to build it.

 

[nerdnic]

Go for it!

 

[kevparang]

Thanks.

 

[brian79cj]

I will try and have wife shoot some video and then have to figure out how to post to Youtube. It's been too windy here last couple of days to maiden it yet.

Nic,
I have looked for your COG recommendation but can't seem to find it. Is it where there are 2 small circle marks on the plans?
What are your thoughts on battery and prop for maiden? I have the NTM 35/48 1100kv, 85 amp ESC. I'm thinking about working myself up to 4cell and 10x10.

 

[nerdnic]

Yep, CG is the little dot on the wing.

For maiden I would go with a 3s modest setup. If there are any build issues you have to trim out then it's nice to do so without plowing the plane into the ground with a powerful setup.

 

[BridgeInspector]

Got to maiden it today at lunch! Super fun! I had a loose y-harness connection that gave me some funky wing drops during flight. Easy fix before next flight.


Landed it!

Now for a bigger motor.


Instagram video
There are also videos that I will upload at a later date.

Great design Nic!

 

[kevparang]

Nice.

 

[nerdnic]

Yes now it's time for a bigger motor! What are you gonna run?

 

[BridgeInspector]

I have my nnP39 setup I can try, (not sure the wings are going to safely hold up for another run).

So I can try this.
NTM 3536 1800 kv
60 amp Plush
APC 7x6
4s 2200 ASpec

At least until I can splurge on a faster set up as the RC budget allows.

 

[nerdnic]

When you can afford it I would say get the NTM 3648 1100kv. It's $20 and works really well on 3s with a 10x10. You'll be around the same speed as your 1800kv on 4s but with more thrust. And then of course you can make the jump to 4s and get over 100.

 

[BridgeInspector]

When you can afford it I would say get the NTM 3648 1100kv. It's $20 and works really well on 3s with a 10x10. You'll be around the same speed as your 1800kv on 4s but with more thrust. And then of course you can make the jump to 4s and get over 100.

They are on my list for next month, along with an 80 amp Dynam.