WolstonFlyer's Tucano

I thought I would start my build thread a bit early just to get it in place and to add my initial thoughts and plans.

Edited By WolstonFlyer on 21/11/2012 11:03:49

I look forward to following along WF

Just for anybody that is interested this is my powertrain setup for the Tucano using HobbyKing parts form the UK warehouse.

NTM Prop Drive 3542 1250Kv

- I am going to test the motor with 9x6 and 10x6 APC style prop

NTM 35 motor mounting pack

Turnigy Plush 60Amp Speed Controller

Turnigy 5A (8-26v) SBEC - just in case the ESC calls it a day the RX will still have power

Turnigy MG90S Metal Gear Servo - Thanks Phil Winks

Edited By WolstonFlyer on 21/11/2012 11:18:48

Thanks Danny...

That looks an excellent setup for the Tucano WF. good to see you're going to test it with different props. I have a 1250Kv motor of about that size, and a 10x6 prop would burn it out on a 3S LiPo, but I know of others that need a 10x6 to produce a useful amount of power. This just shows that not all Kvs can be trusted. Can you let us know the current and power figures when you do test?

Good luck with the build, it's good to see a build thread started.

My first problem was that the Turnigy prop drive adapter did not fit on the motor, it was also bent so have ordered a new one .

The hole at the back of the adapter did not fit over the end of the motor, no amount of pulling down on the bolts would fix it (measuring with calipers shows it was just 0.06mm too small) , I have filed the hole bigger so that it now fits but as the shaft is bent it is still no good. I just hope the new one is better!

This is how I plan on mounting the motor with a new former (F1A)

A bit like this from Chris Bott's Whizza build

Edited By WolstonFlyer on 21/11/2012 11:31:32

Thanks Chris, I am taking your lead for the motor mount... see the last picture above

I will post some motor / prop test data as soon as I can get into the shed during daylight hours to do tests.

I was basing my prop "estimate" from the comments on the HK website. One reviewer says.

"Using 3S TGY Nano 2650mAh 35C and Eflite 2100mAh 30C

10x7 APC WOT 46amps 503watts
11x5.5 APC WOT 45amps 493watts
11x5.5E APC WOT 495watts 43amps 9356rpm
10x7E APC WOT 510 watts 46amps 9930rpm

I might start by testing the 10x6 and see what power that gives, Nigel says that 400 Watts is plenty for this model so can always prop down to 9x6 for fewer amps and longer flight time if there is enough thrust.

Edited By WolstonFlyer on 21/11/2012 12:00:37

Great idea WF (shame about the lack of fit!)

just in case it helps, I ended up chopping out the former below the cross mount. this was to make room for the ESC to fit nicely under the motor and in the airflow.

I needed it further forward so I could get the battery further forward for C/G too. Of course this is on a different model, but it's still one that was designed for the same heavy brushed motor at the front.

Good point about making room for the ESC, I will include that on my notes (yes I have started a new posh notebook for this build!)

Do you think the former needs triangle stock on both sides to hold it in place for strength?

If I actually draw up the shape of the former I will post a picture here. I have not ordered any wood yet, I am waiting to see what the wood pack will cost v's ordering direct and getting some extra for the mistakes I will make!

Well yikes, that is another £20 spent on this model and I have not even built anything yet...

From Giant Shark

Bye for now

Edited By WolstonFlyer on 21/11/2012 18:56:54

Don't know if you've seen this Motor/Prop calculator but it's very good. The figures it gave me are almost identical to those I measured with my watt meter. Means you can 'test' different prop sizes for a given motor/lipo combo before actually having to buy them

Dave.

Edited By WolstonFlyer on 21/11/2012 22:27:04

Edited By WolstonFlyer on 21/11/2012 22:29:33

WF after that photo of mine that you posted, I added a doubler to the inside of each fus side. It took the space between the bulkhead and the Wing seat doublers you can see in the photo.

I got a few jobs towards the build done today, did all of the soldering on the electronics and tested the new servo's and motor. The motor is a beauty, very smooth and quiet. I am going to do some power tests with different sized props but I need to make a simple test stand first.

A little brown box also arrived from GiantShark containing some 10x6 and 8x4 props, clevis, horns, swing keepers, wheel collets and and a 5m roll of black covering.

I am still waiting to see how much the wood pack will be before putting in an order at SLEC or Balsa Cabin.

I am quite suprised at how good the Tunigy MG90s servo's are, quite quick and good centering. They are basically a metal gear version of the popular HXT900, even the plastic case is exactly the same design but black rather than blue.

This was taken just before shrinking the heatshrink, the Orange RX is just for testing that everything is working.

One thing I don't like on the motor is the tiny C clip that holds the motor shaft and all of the thrust from the prop, I just know it will fail at some point....

So I have added a 4mm wheel collet as a backup... perhaps I just worry too much?

The last thing I did was to make up a twin battery cable so that I can try flying with two 2200mAh 3S LiPo's in the plane for longer flight times, rather than buying bigger batteries ( I have quite a few 2200's for my existing planes and helicopter)

It was a bit of a squeeze getting two 12AWG cables into the XT60, you can buy a cable like this from HobbyKing but I had the bits to make one up.

Edited By WolstonFlyer on 25/11/2012 01:02:31

Hi WF, I also will be watching your blog, not so much for the balsa bashing phase (good as it is) but for the info I will gain on the electrics. Dyed in the wool ic nut, but try ing to learn a bit on how power chains are chosen for a particular model. Built a few of Tom Wright's PLs and Dart just to gain some knowledge, and will not break the bank if any thing goes wrong. Cheers

Edited By WolstonFlyer on 25/11/2012 18:59:01

Edited By WolstonFlyer on 25/11/2012 22:20:46

Hi, I have gone for the TGY 35/36 motor and the prop. shaft fits OK. Not run it as yet.

Also I have redesigned the wing with a slightly more scale shape but with a little loss of area and is to be built up having a 15.4% section to take electric retracts. Hope to equal out the weight with a lighter general build. Ribs nearly all cut so here we go.

Spent a small fortune already on the bits, not including canopy, pilots and covering.