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SIG Hummer

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SIG Hummer

Post  ian1954 on Sat Sep 14, 2013 9:45 am

I originally got this to replace the NightHawk for the "Cox Flight Contest" - It said 1/2A and I never thought to check the measurements. After Ron's little hint I realised it would not be suitable for my tiny flying site! 1/2A!!! It is enormous!

Waste not, want not!

I subscribed to a model aeroplane magazine and received a fuselage building jig as a gift. This was an opportune moment to give it a whirl.

It took longer to build the jig than the Hummer progress in this post.



It is a start.
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Re: SIG Hummer

Post  ian1954 on Sun Sep 15, 2013 3:42 pm

This Hummer is getting bigger - 1/2 A - this is why it isn't replacing the NightHawk.



This is it next to the KK Radian.

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Re: SIG Hummer

Post  duke.johnson on Sun Sep 15, 2013 3:53 pm

they are looking great! I need to get back to working on my r/c plane
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Re: SIG Hummer

Post  ian1954 on Sat Sep 28, 2013 4:07 pm

More progress - I have finished the wings!

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Re: SIG Hummer

Post  Cribbs74 on Sat Sep 28, 2013 9:08 pm

Looking good Ian. Let me know how it flies!

I have been afraid to fly mine after I crashed it back in '92
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Re: SIG Hummer

Post  Mark Boesen on Sun Sep 29, 2013 12:33 am

looks good, take it from experience and be sure to make it so you can tell right side up from wrong side at a distance. It's gonna be fairly fast so don't set it up for max RPM.
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Re: SIG Hummer

Post  ian1954 on Sun Sep 29, 2013 5:58 am

Mark Boesen wrote:looks good, take it from experience and be sure to make it so you can tell right side up from wrong side at a distance. It's gonna be fairly fast so don't set it up for max RPM.
I had originally intended this to be for my RTP escapades but after Ron pointed out the size I abandoned that idea but didn't want to leave it in its box. I have seen a few videos of them in action and it would be far, far too fast for me in standard form an build. It is being "modded" - I hope it will end up as a "Sport" rather than a "Yank and Bank" pole racer.

I have never used this iron on covering before (Lightex) but I only bought two rolls, red and clear red. I do understand your comment - the Hummer has no definitive shape and, even at a short distance, it will be easy not to see which way up it is and further away, whether it is coming or going! Especially with my eye sight.

I will be finding out the stalling speed very quickly!

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Re: SIG Hummer

Post  ian1954 on Fri Oct 18, 2013 6:36 am

I have had quite a break from building the Hummer. Sidetracked with many things (apart from mass building - I like to build a few models at the same time).

I decided that I wanted to modify it so that it has a rudder and spent the usual 3 seconds mulling it over and then slicing the existing one with a knife. This has been made from the original rudder.



It is not far off being finished now.

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Re: SIG Hummer

Post  Mark Boesen on Fri Oct 18, 2013 1:27 pm

Congrats, looks really nice!

First thing I thought of was a white sunburst pattern on top of wing, classic 80's!

What are you using for a power plant?
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Re: SIG Hummer

Post  roddie on Fri Oct 18, 2013 1:45 pm

Mark Boesen wrote:Congrats, looks really nice!

What are you using for a power plant?
Something "HOT" should allow "knife-edge" with that rudder mod!!!
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Re: SIG Hummer

Post  ian1954 on Fri Oct 18, 2013 3:52 pm

Mark Boesen wrote:Congrats, looks really nice!

First thing I thought of was a white sunburst pattern on top of wing, classic 80's!

What are you using for a power plant?
Shhhhhhhhhh! Don't tell anyone!

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Re: SIG Hummer

Post  pkrankow on Fri Oct 18, 2013 5:21 pm

So...what is it (motor and ESC), what are you proping it, and what battery?

Phil
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Re: SIG Hummer

Post  roddie on Fri Oct 18, 2013 6:46 pm

Yup... "knife-edge".... Is that a 10-6?
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Re: SIG Hummer

Post  Cribbs74 on Fri Oct 18, 2013 7:50 pm

ian1954 wrote:
Mark Boesen wrote:Congrats, looks really nice!

First thing I thought of was a white sunburst pattern on top of wing, classic 80's!

What are you using Babe Bee .049 for a power plant?
Shhhhhhhhhh! Don't tell anyone!

Babe Bee .049 Devil 
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Re: SIG Hummer

Post  Mark Boesen on Fri Oct 18, 2013 9:50 pm

NNNNNOOOOOOOOOOO!!!!!!!!!!!lol!

Here's my latest project, notice the use of old decals, the other side has a 1983 AMA sticker:


but, I'm flying these more often:
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Re: SIG Hummer

Post  ian1954 on Sat Oct 19, 2013 10:35 am

The aeroplane is a beauty but I was intrigued by the discs and thought " fly those?".

Then I saw "disc golf" - never come across it before - so I searched



Neat, cheap and exercise without overdoing it!
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Re: SIG Hummer

Post  ian1954 on Sat Oct 19, 2013 11:27 am

pkrankow wrote:So...what is it (motor and ESC), what are you proping it, and what battery?

Phil
EMAX Brushless Motor BUDGET 2220-07 KV1200
Specifications

No. of cells: 2-3 Li-Po
Stator Dimensions: 22x20mm
Shaft Diameter: 4mm
Weight: 85g/3.03oz
Rec. Model Weight: 400-1200g
Rec. Prop: 9x4.7, 10x5, 10x4.7
KV (rpm/v): 1200
Example uses:

Cell Count: 3S
Prop (APC): 10x4.7
RPM: 8560
Max Current (<60s): 28 Amps
Thrust: 1300g
Cell Count: 3S
Prop (APC): 11x3.8
RPM: 7843
Max Current (<60s): 31 Amps
Thrust: 1400gTower Pro H40 Amp ESC 50AMP Burst Heli/Aero


H40A ESC for heli & airplane
Specs

Dimensions: 70x31x11mm
Burst Rate (15sec): 50A
BEC Current: 1.5A
Voltage: 7.4-11.1V (2-3 cell Lipo/5-10 NiMH,NiCd)
Weight: 47g

The battery will probably be 3s 2200mah - will not decide until tested and run through a watt/ammeter along with propeller testing.
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Re: SIG Hummer

Post  pkrankow on Sat Oct 19, 2013 12:40 pm

So...a .15 to .35 equivalent (per recommended prop size) on an airplane meant for a TeeDee .049 or .051

Slightly overpowered there.Very Happy lol! 

Good thing throttles don't need to get ramped up all the way.

Phil
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Re: SIG Hummer

Post  ian1954 on Sat Oct 19, 2013 12:56 pm

pkrankow wrote:So...a .15 to .35 equivalent (per recommended prop size) on an airplane meant for a TeeDee .049 or .051

Slightly overpowered there.Very Happy lol! 

Good thing throttles don't need to get ramped up all the way.

Phil
You are perfectly correct! It is experimental but the combination was recommended to me by an expert when I said that I wanted to be able to fly it slowly! Mmmm!

We will have to wait and see. But I always remember large props on rubber powered planes turning slowly producing graceful flights. (Wishful thinking?)
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Re: SIG Hummer

Post  pkrankow on Sat Oct 19, 2013 1:49 pm

yea...slowly Huh... 

11.1V * 1200kv = 13,320RPM DAMMIT! 

I hope you get good throttle range. lol! 

you can try a 2s battery at 7.4v

7.4V * 1200kv = 8,800 rpm Popcorn 

Phil
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Re: SIG Hummer

Post  roddie on Sat Oct 19, 2013 4:44 pm

Is the wing spar mat'l. "as per plan"... or did you choose to use a stronger wood? (just curious)

I watched a guy "wring-out" an Ace "All-Star Bipe" with a .40 on it... He was an accomplished 3-D flyer, and at launch; the plane R.O.G. in about 20 ft. and went straight-up like a rocket! It was flying very well... "unlimited vertical"... spins... barrel-rolls... inside/outside loops... until both wings folded. Everyone at the field gasped as it tumbled to the ground. He probably would have had his hands full attempting to land, if he'd gotten the chance. It was a small field with tall trees around the perimeter. He would have had to approach final "hot"... and there simply wasn't enough runway for that. "S.T.O." rather than "S.T.O.L.".... It "did" have foam wings... and I can't remember if he reinforced them or not. Probably not, as he had built and flown it with the recommended .10/.15 engine size previously.

I know you'd never intentionally risk a model in this way... This was just a memory of my witnessing what happened to a "ridiculously" over-powered plane.
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Re: SIG Hummer

Post  pkrankow on Sat Oct 19, 2013 4:59 pm

With the 3s RPM of 13k ish you could put a 6 or 7 inch diameter prop with a 3 or 4 pitch on it and problem solved. Electric doesn't really care if it is under-proped.

Phil
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Re: SIG Hummer

Post  Mark Boesen on Sat Oct 19, 2013 6:14 pm

Ian, You're forgetting its gonna have to fly a lot faster with all that extra weight.
You might want to look at something like this:
http://www.hobbyking.com/hobbyking/store/__6547__TURNIGY_2204_14T_19g_Outrunner.html and use a 450-850 mah, 2 cel

Thats a pretty cool disc golf video, but remember those guys making all those shots have been playing a long time and are really good.

I still have my All-Star bipe with a Fuji .099 (Hobby Shack) its got more power than it needs, i can't imagine how a .40 would even balance out.
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Re: SIG Hummer

Post  pkrankow on Sat Oct 19, 2013 8:04 pm

That or a little bigger (less than 15A) 3s, 1000mAh and you can expect 10 minute flights..  Go with a 7 inch prop and it will be pretty light loading on the system.  You will have to fit the battery pretty far forward to balance due to the weight differences between the drive trains.

I don't like prop savers.  I find they are a pain in the rear, so I would up to a slightly larger motor and ditch the prop saver.  Shoot for 150W which will easily swing an 8 inch prop, and happily swing a 6 inch prop.

Turning an 8 inch prop at 13k rpm is fine (do not use a "slowfly" prop at these rpm's  they distort and beat air), so 1400kv is a good

Phil

edit
sub-50g motor. 1300mAh batteries are roughly 100g+a bit.


Last edited by pkrankow on Sat Oct 19, 2013 8:25 pm; edited 1 time in total
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Re: SIG Hummer

Post  pkrankow on Sat Oct 19, 2013 8:14 pm

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Re: SIG Hummer

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