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Agritug

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Paulo Peres06/05/2020 19:35:44
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137 forum posts
149 photos

Hi all,

One question regarding the servos - will Hitec HS-81 micro servos stand up to the job on all moving flying surfaces? The specs are as follows:

Motor Type: 3 Pole
Bearing Type: None
Speed (4.8V/6.0V): 0.11 / 0.09 sec @ 60 deg.
Torque oz./in. (4.8V/6.0V): 36 / 42
Torque kg./cm. (4.8V/6.0V): 2.6 / 3.0
Size in Inches: 1.17 x 0.47 x 1.16
Size in Millimeters: 29.72 x 11.94 x 29.46
Weight ounces: 0.58
Weight grams: 16.44

At the stated torque, I believe it will suffice. Right or wrong?

Thx.

Paulo

Chris Reid07/05/2020 06:49:15
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225 forum posts
95 photos

Hi Paulo,

My Agritug has a single small Hitec HS42 for the ailerons, and a Ripmax SD200 for the elevators. Both have been adequate for the model which is fully aerobatic. I'm guessing that your choice will be fine. Hope this helps,

Chris.

Paulo Peres07/05/2020 10:20:14
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137 forum posts
149 photos

Thx Chris for your input.

I also think that servos with nearly 3kg/cm are more than capable of handling the loads in the moving surfaces. But other opinions are always welcome.

Stay safe!

Regards,

Paulo

Paulo Peres09/06/2020 23:27:35
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137 forum posts
149 photos

Progress on the Agritug so far:

whatsapp image 2020-06-09 at 23.15.02.jpeg

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whatsapp image 2020-06-09 at 23.15.03.jpeg

Chris Reid10/06/2020 10:35:22
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225 forum posts
95 photos

Looks good Paulo. It's great to see another Agritug coming into being.

Keep well,

Regards,

Chris.

Paul Marsh10/06/2020 11:28:15
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4090 forum posts
1233 photos

I have one, rescued it from a bin at a fly in, had most servos in it and flew on electric, so I put a GP 42 in it a resurrected it. Wasn't damaged, which was a pity for it to end its life in a bin...

agritug (2).jpg

Chris Reid10/06/2020 11:50:46
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225 forum posts
95 photos

Interesting Paul. Nice that you saved it. I was in transition to going all electric when I designed Agritug. I imagine it goes pretty well on I/C power.

CR

Paulo Peres10/06/2020 16:35:01
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137 forum posts
149 photos

Thanks Chris. The goal is to maiden the model in July.

Paul Marsh - good that you saved it! Other than complete write-offs, no model should end its life in a bin!

Paulo

Paulo Peres19/07/2020 21:44:31
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137 forum posts
149 photos

Despite this week efforts on the model, it was not enough to have it ready to maiden today. Lack of suitable acetate for the canopy as well as canopy glue meant it was not going into the air. Plus, proper routing of wiring in the fuselage is still to be done, Other than that, it only needs registration letters and a romanian flag as per the plan, Can be installed later. Weather permitting, next weekend is likely to maiden.

20200718_235431.jpg

Chris Reid20/07/2020 09:50:54
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225 forum posts
95 photos

Great to see your progress Paulo. Good luck with the first flight. Mine was pretty uneventful, just a click or two of aileron trim needed. Super to fly thereafter, and still a flying favourite.

I'm not doing any flying right now. Being ancient I'm taking no risk of catching the virus so avoiding meeting other people. My DH84 Dragon (see the forum elsewhere) has yet to complete first flight trials as I've had to modify the motor rotation directions after uncontrollable swerves left on the take-off run.

Chris.

Paulo Peres20/07/2020 16:54:38
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137 forum posts
149 photos

Thanks Chris!

I's a pity having to be confined due to the damn virus. It really wrecked a lot in our lives angry 2

Checked the DH84. Lovely. I visited Duxford twice and got to see the real thing flying. Awesome!smile d

Regards,

Paulo

Paulo Peres05/08/2020 19:57:05
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137 forum posts
149 photos

Hello Chris!

The Agritug maidened today and it was a success! See it here: **LINK** and you can also check Clube de Aeromodelismo de Lisboa FB profile.

Still needs more weight up front. Just this flight today, as when i was readying the model for another flight with more 50grs in the nose, i found out that the tailwheel had decided to go its own ways and it was an hopeless search in the scorching heat!

Curious to see that it's been 9 years already that the plan was published!

As soon as there's more videos i'll let you know.

Best regards,

Paulo

Chris Reid06/08/2020 06:29:18
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225 forum posts
95 photos

Congratulations Paulo. It was good to see that your Agritug behaved itself pretty well on the first flight. It is always a bit of an anxious process wondering what you are going to get. It is a surprise to me too that the design is nine years old, and that I have been designing for eighteen years. Where does the time go? Your flying field looks like a pretty hot place! Enjoy your next flights.

Chris.

Paulo Peres07/08/2020 21:05:52
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137 forum posts
149 photos

Thx Chris!

Next Sunday it looks the weather (wind wise) looks good. It'll be hot again, of course. At least, we've got some pine trees to provide some shade, whereas at Ota airbase where I also go flying regularly, there's no such thing. Furthermore, you get hot from above and from the tarmac reflecting the heat! hot

Have a great one!

Paulo

PS: "Where does the time go?" - a zillion dollar question...

Chris Reid08/08/2020 06:41:21
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225 forum posts
95 photos

Enjoy your second Agritug outing Paulo. 35C here in UK yesterday! My garden needs rain, but has lots of shade. Looks like climate change is getting closer?

Chris.

Paulo Peres15/08/2020 09:25:28
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137 forum posts
149 photos

Hello Chris,

Check in this link **LINK** the 2nd flight of the Agritug preceded by the 1st flight to see how it behaved after adding more 95grs at the front.

The 3rd flight ended in a bush because the engine cut in flight. Bent motor axle and some scratches😒

At home I found out that the culprit were faulty solder joints, as i moved them around and the engine performed flawlessly in some positions and not in others. When I come back from holidays I will solder the connections again.

Best regards,

Paulo.

Chris Reid15/08/2020 10:11:22
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225 forum posts
95 photos

Hi Paulo,

I was sorry to read that your Agritug has had a minor prang. Mine has had several (all my fault) but always came back. Dry soldered joints can cause problems. I recently got my money back on a non-working cheap Chinese ESC, only to find later a dodgy soldered motor connection.

all the best.

Chris.

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