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Old Oct 16, 2008, 04:24 AM
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Austar cessna 188 AG Husky tow plane Review

Hi guys.....Guess what turned up at work today? give up? Well the good folks at Austar models have done thier homework and listened to thier customers and have produced an outstanding model of the cessna 188 Ag husky. Since the models original conception, the models has undergone several changes in responce to the modellers wish list.

So first off the model comes in a very sturdy double box affair to look after your new toy in transit, this also doubles as an overgrown rubbish bin to put the acres of protective wrapping that every component has been carefully protected in.

Construction consists of a very light built up ply and balsa construction with high quality covering film finished to a very high standard that puts other manufactures to shame. The hardware as per all of Austar s models, is also to a high standard and as such is a testament to the time and attention to detail that has gone into the design and development of this model.

So down to business..... First off my intention with the Ag husky is to use it for Aerotowing as a replacement for my now deceaced ESM Cessna 185 that served me well for over 250 flights and was lost through no fault to the model.

The power plant for this build will be the DL 50 due to it's power and reliability. This is on the bottom of the power range as the recomendation is for 50-85cc but given the light weight of the airframe will prove to be more than adequate.

In keeping with my usual style of building the instructions were given the once over followed buy the heave ho and are provided as a general guide to building the Husky. So for me building began with cutting the film for the underfuselage hatch and ironing the edges of the covering down. This then gives access to mount the alloy undercaridge and in doing so help to avoid hanger rash during construction. Now imagine my surprise when I opened the tyrebag and found a gorgous set of solid and light weight rubber 5" cub style wheels with tread and all, no leaky tyres around here! All in all pretty good so far.

More to come....
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Old Oct 16, 2008, 04:32 AM
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Hi guys well I got some more done to the husky today and fitted up the DL 50 using the supplied stand offs and a 10mm packer from an SWB standoff kit that I bought from THE HOBBY MAN. this gives you about 5mm clearance for the backplate of the spinner and allows for a 6mm overlap of the fuselage with the cowl.

Next up I have made a start on the Tow release pylon. Now normally I would mount the hook for a high wing between the trailing edge of the wing but on a low wing like my 80" pawnee I have fitted the hook at the junction between the cabin and turtle deck. Normally this would be fine but given that the cabin is set well back on the model and due to the height of the fin this simply isn't going to be possible so up the cabin we go! so my solution is to make an internal ply structure to carry the tow hook and tie this into the pre existing fuselage structure. Now tepmplates will be available at a later time to make the tower structure....once I know it works! Using patternmakers dividers I was able to measure the inside of the structure and lay this out on a sheet of 1/4" seven ply and use the width of the ruler for wall section and are made in two halves to get them into position, later they wil be sandwitched between 3mm five ply when joining. to allow the new structure to fit inside the cabin some material will need to be removed, refer to pics.

Oh did I mention I got a great suntan while out flying my 80" pawnee, cropduster style......

cheer Rossco.
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Old Oct 16, 2008, 06:15 AM
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Quote:
Originally Posted by Big Nuts 181
fitted up the DL 50 using the supplied stand offs
Supplied with the engine? My 188 didn't have any in the box.
Did you use any right or down thrust?
Thanks Kerry
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Old Oct 16, 2008, 06:21 AM
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PS If you happen to trace or copy the pattern for the tow support it would save a couple of us time. Looks great so far, it will be interesting to see how the canopy fits.
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Old Oct 16, 2008, 08:55 AM
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Hey guys I got some more done to the cessna tonight, first up I decided to mount the cowl, now with the motor being centred according to the centre lines on the engine box the cowl was offered up and found to be a really good fit, so good that I decided to pack the motor forward a further 4mm, I lost a couple of mill there somewhere.... with the cowl removed and using masking tape, I ruled a datum line from the mounting holes on the side of the fuse and marked 100mm back this will give you a straight line to pick up again after refitting the cowl. You can now transfer the 100mm from your previously marked point ont a piece of tape on the cowl and hey presto, your holes in the cowl are perfect every time and buy using tape you resist problems of chipping your gorgous paint....an oldy but a goody!!

Next up was to do some more on the tow hook mast. I decided that I could sufficiently stiffen the mast with diagonal 10mm round dowl travelling from the top of the mast, past the rear former and to the floor of the longerons in the bottom of the fuse. To capture the top of the dowl I made a ply doubler that encapulates the top of the dowl, this also ties the two sides of the former together up top and will also have a doubler at half mast. Later on I'll fit the tow release servo and sliding pin arangement.

An eggspert is mierly an egg under preasure!

Rossco
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Old Oct 18, 2008, 06:12 AM
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So come on guys how about some feed back!!
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Old Oct 18, 2008, 09:44 AM
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IT IS GREAT, so far. I am waiting for you to post a PDF of the templates so I will have an easy job when I start mine. I've got a BME 58 sitting on the bench, just need a bunch of time.
I think that your mast will stand up to any sailplane that you will be able to tow with the 188.
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Old Oct 18, 2008, 11:07 AM
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very nice build! Could you provide a link to the store selling this plane? Since you state it is a light weight structure, do you think it will be a good model for electric power? Thanks

http://iflytailies.jimdo.com/
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Old Oct 19, 2008, 05:29 AM
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Hi guys thankyou for the feed back, the manufacturer is Austars Models http://www.austars-model.com/dispdet...01161229146178

And yes I think it is definately electric convertable, as is the hanger 9 pawnee.

more pics to follow tonight.
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Old Oct 19, 2008, 08:52 AM
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Hi guys, well I got some more work done tonight and last night on the Husky. This involved glueing in the Tow release tower and stiffening dowls in between watching those super tight short shorts of Jessica Simpsons on the box......waw! So the morning after left me trimming the tower down a little to better fit with the canopy attached. So far so good, I'm one happy camper.

Next up was to cut a wrather big hole in the tailplane root rib the size of a Hitech HS 645mg. This is my servo of choice as there plenty grunty enough with 10kg of torque at 6 volt. Now there's two reasons for cutting the hole. First it allows you to see whats inside the structure and secondly it will give you access to the servo mounting screws. I decided for simplicity I would also cut a hatch in each tailplane half just to make putting the servos in one hell of a lot easier and for future servicing should the need arise and will have mounting tabs on the inside as I have done for my other build, the 120" cessna 182. While checking over of the models hardware two things became apparent, you are only supplied one set of wheel collars for the main axles, I added a set of dubros with the inner ones being used to space the hubs out from the uc legs. Secondly one thing I learnt from my 86" cessna 185 was the damaging effect vibratin particularly at idle has on the elevator hinges with a big single up front and after 250 flights the hinges were as sloppy as. With this being the case I have replaced all of the hinges with Robart items of the same size, just to be on the safe side.

Just for the hell of it I have fitted my 1/3rd scale Dubro pilot I bought many moons ago and bugger me he's a perfect fit!

Last off I also made a start on roughing in the electrical system on the engine box consisting of the ignition module which has been soft mounted on silicon fuel tubing, the emcotec regulated ignition kill and finally a 5 cell 2700 nmh pack. As I'm not too sure how the CofG is going to come out I may also fit a 3600 intelect 5 cell flight pack up front on the side of the engine box, it fits like a glove!

cheers Rossco.
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Old Oct 20, 2008, 07:50 AM
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Hi guys well I only got a tiny bit done tonight....family comitments....but I came to the conclusion that the easiest and quickest way to hook up the throttle and choke servos was to simply cut out the covering infront of the UC......and guess what? there is a mirriad of servo holes to be had! now this instantly makes life one hell of a lot easier and gives you the option of either fitting a removeable hatch or simply covering back over the hole. now as to the big access hatch behind.....now I have a cunning plan for this one I think you'll like but you'll have to wait, I'm wrecked after three nights of building till midnight.

cheers Rossco.
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Old Oct 21, 2008, 08:50 AM
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hi guys well I got the throttle and choke servos hooked up tonight and are made from 4-40 all thread and sleaved in carbon rod. once the correct length is estableished both ends were of the carbon rod were CA'd to help prevent splitting and to make the assembly stiffer, additionally I added a short length of heat shrink just to be safe on the throttle pushrod. The pushrods were then fitted off with 2-56 Dubro ball links. Now one thing I was a little surprised at was that there isn't any ply under the centre of the UC....that is to say that all the load is carried on the outer 2" of the undercarige mount and while this isn't of any concern to me as this is where all of the work is done it was a pain in the rear as there isn't anywhere to iron your covering too for the forward hatch. the fix is very simple, I just added some 1.5mm ply cut to a neat fit and CA'd into place and simply slid this under the covering and ironed it down, no biggy....

So last but not least I cut out the cooling hole in the bottom of the cowl and measures 3" from the back edge of the cowl to about an inch off either side of the cowl. I have also decided to cut out the intake slots that are situated below the spinner and in between the landing lights and have roughed them in with a cut off wheel and will finish up the radiuses on the ends with a needle file.....Oh did I mention I am fitting landing lights also.... a very easy addition and will really help with the last flight at dusk on landing....

cheers all Rossco.
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Old Oct 22, 2008, 08:01 AM
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hi guys I managed to get another time consuming job done tonight and made up an elevator servo loom consisting of two 24" hitech heavy duty extension leads and some standard servo wire to power the fin strobe. This was then encased into braid purchased from the "Hobby Man" and heat shrunk at each end. Braid as the name states is a braided sheath that encapulates and protects electrical wires and is now commonly used in fitouts of large IMAC style models as it protects your precious cables ties them all together and helps to remove the look of the dreaded birds nest. The plug ends, ie- servo end at the tail are fitted through rubber gromets that simply slide over the inside and outside of the fuse and will prevent wire chafe and failure to your leads they can be purchased from your local Tandy or electrical store.

cheers Rossco.
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Old Oct 22, 2008, 12:08 PM
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Nice plane, but I don get it! Sailplane forum??

Gustavo
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Old Oct 22, 2008, 12:20 PM
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AHHHHH TOW PLANE!! Sorry.

Gustavo
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