chris edwards 3 Posted December 18, 2012 Share Posted December 18, 2012 hi guys am in the process of working out how much it will cost me to make the agritug, and the first thing i come to is the motor, i want mine to have a fair bit of power because i am thinking of giving mine the abilty to tow small gliders so i have found two motor that i could go for first and the second . the batterys i have are 3s 2200mah and 4s 2200mah, so could someone advise me on which motor will give the most POWER!!!! also what was the electric set up others are using on theres? chris Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted December 19, 2012 Share Posted December 19, 2012 Hi Chris. You will need about 300 watts to tow small gliders I guess. My Agritug is fully aerobatic on that which I get from 2 x 2200 3S lipos wired in parallel to give a total battery of 4400mAh. That gives around 10-12 minutes flying. It doesn't matter if you use 3S or 4S lipos, 300 watts is the key figure. A 3S lipo will draw more current that's all. choose a motor that will pull 300watts on a 12x6 inch prop, with a 30amp ESC, and fit the biggest battery capacity you can get in. I can just fit 2 lipos at 3S, a 4S lipo will be bigger, but you will be able to fit a larger capacity one. You will only get around 6 or 7 minutes endurance from a single 2200 lipo at 300 watts. I hope this helps. Chris Quote Link to comment Share on other sites More sharing options...
Geoff Jackson Posted December 19, 2012 Share Posted December 19, 2012 Only just picked up on this thread. I started mine in July as well. Nearly finished wings. struggled with the canopy getting it square so I'm gonna do it again. I'll have to get going on it again now I've read all this!!! just getting motivated to get out to the garage,get heating on and do it!! Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted December 19, 2012 Share Posted December 19, 2012 chris this motor says that it is 750KV and 206 watts, have also found this motor that says 750KV and 350 watts on eather two 3s 2200mah, or two 4s 2200mah, think this should give me more power but just want to be sure. i personly think i will go with the second motor as i think it will give more power but not sure (new to electric) chris Edited By chris edwards 3 on 19/12/2012 15:38:43 Edited By chris edwards 3 on 19/12/2012 15:39:05 Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted December 19, 2012 Share Posted December 19, 2012 Should do the business fine . C Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted December 19, 2012 Share Posted December 19, 2012 sounds good, will wait till the new year to start but then i will be off on nother build. Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted December 19, 2012 Share Posted December 19, 2012 oops ment to say another not "nother" Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted December 24, 2012 Share Posted December 24, 2012 its me again have been trying to keep the cost of this build down as best i can and in my flight box i have a load of these 9g servos just wandering if they will do the job. chris Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted December 24, 2012 Share Posted December 24, 2012 Nine gram servos might be a bit marginal for a model of Agritugs size if you wanted the full aerobatic performance, particularly for the elevator. However,I think you would get a model that would fly ok - I have used them in bigger gliders, and for the ailerons in bigger power models with no problems. The original Ripmax SD200's aren't much bigger and are well up to the job. At the tail end the closed loop controls will be ok with the small 9g servo arms, but the need for push/pull rods for the ailerons may cause problems with them bending under load because you will have to use thin wire. On another design that's similar, I beefed up the thin wire between the servo arm and the aileron torque rod with some thin carbon rod held on with shrink tube - a cocktail stick would have done the job too. As an alternative, you could use two aileron servos, one in each wing. Chris Quote Link to comment Share on other sites More sharing options...
chris edwards 3 Posted December 24, 2012 Share Posted December 24, 2012 i was planning on having each aileron running of an induvidual servo, but looks like i might need to get some more servos then. i was also going to mount the servos inboard and have pushrods running up the inside of the plane to the elivator and rudder, should be ok shouldn't it? chris Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted December 24, 2012 Share Posted December 24, 2012 Getting push rods that are stiff enough in the space may cause the odd problem. The closed loop system works well and could be fitted inside, albeit a bit fiddly to install. The open air servos aren't visible in the air. Chris. Quote Link to comment Share on other sites More sharing options...
Paulo Peres Posted April 28, 2020 Share Posted April 28, 2020 Hello all! This model has been in my list for some years. Now, the lockdown 'age' provided the perfect setting to start building it. I found the pictures in this thread to be very informative, as I cannot acces the computer disk with the original digitized article. Only two pictures now, but as I write this message, all fuselage parts have been cut as well as the central wing ribs and the wingtip pieces. Watch this space for more. Suggestions from all of you will be highly appreciated. Best regards, Paulo Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted April 28, 2020 Share Posted April 28, 2020 Hi Paulo, it's great to see another Agritug being built after so long. 2011 now seems like history. I still have my original design model and, although it shows signs of a lot of flying, it is still a favourite for its friendly flying characteristics and I have kept it despite reducing the size of my fleet by disposing of other models. keep some info coming on your build and if I can help at all, come back through the forum. Chris R Quote Link to comment Share on other sites More sharing options...
Former Member Posted April 28, 2020 Share Posted April 28, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Paulo Peres Posted April 29, 2020 Share Posted April 29, 2020 Thank you Chris and Bell for your kind words. I'll be back here and surely I'll ask nagging questions to vou I'm a slow builder and not that competent. I also have lack of a proper workshop, having to make do at the home office (I live in an apartment) and occasionally at my in-laws garage. Sometimes I get to use a properly mounted drill and sanding and sawing machines. Otherwise, I do it all manually! Thus, I may stall the build for months at a time Anyway, I'll set the goal of maidening the model in 2020. Meanwhile, only the ribs need cutting (the central ones are done). Regards, Paulo Quote Link to comment Share on other sites More sharing options...
Paulo Peres Posted May 6, 2020 Share Posted May 6, 2020 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 Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted May 7, 2020 Share Posted May 7, 2020 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. Quote Link to comment Share on other sites More sharing options...
Paulo Peres Posted May 7, 2020 Share Posted May 7, 2020 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 Quote Link to comment Share on other sites More sharing options...
Paulo Peres Posted June 9, 2020 Share Posted June 9, 2020 Progress on the Agritug so far: Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted June 10, 2020 Share Posted June 10, 2020 Looks good Paulo. It's great to see another Agritug coming into being. Keep well, Regards, Chris. Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted June 10, 2020 Share Posted June 10, 2020 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... Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted June 10, 2020 Share Posted June 10, 2020 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 Quote Link to comment Share on other sites More sharing options...
Paulo Peres Posted June 10, 2020 Share Posted June 10, 2020 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 Quote Link to comment Share on other sites More sharing options...
Paulo Peres Posted July 19, 2020 Share Posted July 19, 2020 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. Quote Link to comment Share on other sites More sharing options...
Chris Reid Posted July 20, 2020 Share Posted July 20, 2020 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. Quote Link to comment Share on other sites More sharing options...
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