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Old Jul 09, 2014, 07:19 PM
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nerdnic's Avatar
United States, CA, Sunnyvale
Joined May 2014
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100mph 800mm FT Mustang



V1 VIDEO
100mph - NTM 35-36 1800kv on 4S
100mph 800mm FT Mustang - NTM 35-36 1800kv (2 min 32 sec)


85mph - NTM 28-36 2200kv on 3S
800mm FT Mustang (2 min 47 sec)


V1 DETAILS
I love my 800mm FT Spitfire so I figured why not make an 800mm FT Mustang?

I added an aluminum spar and am flying without a rudder or landing gear. Other than that it's just scaled down compared to the original FT design.

V1 PLANS
I have added the plans here.

ELECTRONICS
MOTOR NTM 35-36 1800kv
BATTERY Zippy 2000mah 45c 4S
ESC 70a Dynam
PROP 7x6 APC
AUW 650g

V1 PICS
I have a different motor/prop on it for these pictures, but same plane.





V1 REVIEW

Pros
For an 800mm plane it performs well. It is quick, light in the air and doesn't stall very easily. It looks great and I would give it a B for high wind performance. I flew it today in 15 MPH wind and it got tossed around pretty good but overall held its own. Inverted was great, it liked being upside down.

Cons
Slow speed - Not great. I had a few close calls with slow speed stalls. Made landing a bit tricky.

Glides - I dropped speed really fast and had to give a lot of corrections to keep it straight.

Elevator - This bird suffers from the squirrely issue that some warbirds run into where giving it 'too much' elevator will cause a weird tippy, stall type behavior. I had to dial back my elevator quite a bit to get rid of the issue, to the point where I didn't feel like I had enough control over the plane at all times. I could still fly fine but I lost a lot of acrobatic capability.

All in all
I like it. The cons are workable and it's fun to fly. I like how it looks in the air and I got a lot of compliments from other pilots. The 800mm FT Spitfire performs better in pretty much every way except speed. The same power set up is faster on the Mustang. But the 800mm Spit is just more responsive and fun to fly, so that will continue to be my main go to plane for now, but I won't be putting the 800mm FT Mustang away anytime soon.


V2 DETAILS
I decided 100mph wasn't quite fast enough and I want to push it further, can I get to 110? 115? I don't have a better motor I can use so I'll be sticking with the 35-36 1800kv for now. So my only option is to streamline the build. Here is what I've come up with so far.

V2 PICS
Elevator servo, RX, GPS, and battery telemetry will fit inside the cockpit.


I added the front cowl covering and included a scoop.




Under camber is gone and brought the trailing edge to a pointed finish. I also removed the open scoop on the belly.


Wing tips came out real nice and clean, and as always my blue canopy


V2 VIDEO
Maiden
djacob7 was very interested in seeing how V2 progressed so he actually met me at the field and was nice enough to film the maiden. Thanks djacob7!
Nic's maiden of his 800mmx900W scratchbuilt Depron Mustang (3 min 18 sec)


Another flight
800mm Mustang (2 min 29 sec)

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Last edited by nerdnic; Jul 14, 2014 at 11:12 PM.
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Old Jul 09, 2014, 09:58 PM
Build straight - Fly twisty
Whiskers's Avatar
Australia, QLD, Little Mountain
Joined Feb 2010
4,158 Posts
Hmmmm! 100 MPH is a scale speed of 1410 MPH.
Would have been handy in WW II...
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Old Jul 10, 2014, 01:00 AM
Fremont, CA
United States, CA, Fremont
Joined Jan 2009
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I'm tempted to build this plane as well based on your input. If I do, maybe we could race either in Sunnyvale or in Fremont ;-)
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Old Jul 10, 2014, 08:26 AM
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United States, CA, Sunnyvale
Joined May 2014
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That would be awesome! Have we met before at Baylands? I fly there a few times a week.
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Last edited by nerdnic; Jul 13, 2014 at 04:13 PM.
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Old Jul 10, 2014, 09:59 AM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
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Imagine what it might do with a proper wing section and a streamlined cowl.
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Old Jul 10, 2014, 10:42 AM
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United States, CA, Sunnyvale
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I have been thinking the same thing. It also has under camber on the wing tips, I'm sure that's really slowing it down too. Do you think the open scoop is an issue?
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Last edited by nerdnic; Jul 13, 2014 at 04:12 PM.
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Old Jul 10, 2014, 12:43 PM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
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The worst part of achieving speeeeeeed, is drag.

You still need cooling, but a small scoop, and a larger exit, shouldn't cause too much drag.
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Old Jul 10, 2014, 05:59 PM
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United States, CA, Sunnyvale
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I'm going to build a v2 with no under camber, a closed scoop, and closed up cowl.
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Last edited by nerdnic; Jul 11, 2014 at 02:10 AM.
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Old Jul 11, 2014, 02:08 AM
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United States, CA, Sunnyvale
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Attached are some pictures of V1 and V2 wing.

- V1 has a lot of under camber and an uneven trailing edge.
- V2 has no under camber, a closed and narrowed to a point tailing edge, and a closed wingtip.

I am not sure how the V2 wing will perform. Overall it's more streamlined compared to V1 but I think I just lost any slow speed performance I had. But the goal here is speed, so that's okay

I am working on the fuse still, where I'm removing the open belly scoop and closing up the cowl, and hope to have V2 in the air this weekend.
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Old Jul 11, 2014, 11:52 AM
Fremont, CA
United States, CA, Fremont
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Looks real good, nerdnic.
Sent you a PM.
Dan
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Old Jul 11, 2014, 02:42 PM
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Cool thanks, Dan!
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Last edited by nerdnic; Jul 13, 2014 at 04:13 PM.
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Old Jul 12, 2014, 11:06 PM
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Wasn't able to get her finished today, but I plan on finishing tomorrow.
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Last edited by nerdnic; Jul 13, 2014 at 04:14 PM.
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Old Jul 12, 2014, 11:30 PM
Fremont, CA
United States, CA, Fremont
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OK nic, take your time but hurry up LOL!
Are you retired? I'm available any day of the week.
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Old Jul 13, 2014, 01:01 AM
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Heh, nope I'm not retired. Still about 30 years from that. I'm just another sucker caught up in the rat race here in Silicon Valley.
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Last edited by nerdnic; Jul 13, 2014 at 04:14 PM.
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Old Jul 13, 2014, 04:12 PM
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Updated first post - V2 build is done, added photos.
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