SIG Hummer

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

More progress - I have finished the wings!

Looking good Ian. Let me know how it flies!

I have been afraid to fly mine after I crashed it back in '92

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.

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!

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.

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?

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!!!

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!

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

Phil

Yup... "knife-edge".... Is that a 10-6?

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  for a power plant?

Shhhhhhhhhh! Don't tell anyone!

  

NNNNNOOOOOOOOOOO!!!!!!!!!!!

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:

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!

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.

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

Slightly overpowered there.  

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

Phil

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.  

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?)

yea...slowly  

11.1V * 1200kv = 13,320RPM  

I hope you get good throttle range.  

you can try a 2s battery at 7.4v

7.4V * 1200kv = 8,800 rpm  

Phil

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.

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

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.

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.

http://www.ecalc.ch/motorcalc.htm?ecalc&lang=en