GoldwingRc 91" Slick540 60cc Observations

[Adrian Smith 1]

After a misunderstanding I took delivery of my next project from RapidRCModels in Kent:-

 

https://www.rapidrcmodels.com/goldwing-slick-540-60cc-arf-c-f-version-yellow-4894-p.asp

I have 2 different 60cc size aircraft that are all powered by an electric power train. Compared to my Goldwing Sbach and ExtremeFlight Extra the wingspan of the Slick is 91" versus  around 85" on the others. The larger size has also contributed to the higher AUW target of 18-20lbs or 8.1-9.1kg. The electric recommendation in the manual is the Hacker Q80-8M (or 4000watt motor) with 12S set up using 2x5000mAh lipos. If using IC the suggestion is DA 70 or GP 61. 

With this in mind I decided to go for the Dualsky GA8000 motor rather than the GA6000 that is on my other 50-60cc equivalent aircraft.

 

It is a make I know well and I trust the extra performance required.

Next is what ESC? Well I have gone for the one I know well which I used for a 100cc equivalent project as I want to be sure I won't overload it.

 

The 200A model is an Opto version which is my preferred ESC. I already have a HobbyWing programming box which I have used before to set the fixed wing parameters.

Servos suggested fall into the 120 in-oz or better with the rudder at 190 in-oz order. I must convert to kg torque which makes more sense to me! Battery capacity may also need looking at.

 

Plenty to think about then. It will be interesting to see if I can use the supplied standoffs or if a different size is required. The prop suggestion starts at 24x10 upwards. 

I will happily post my progress on the build and the motivation behind my decisions if there is a desire to see the process.

 

 

 

Edited November 10, 2022 by Adrian Smith 1

[Adrian Smith 1]

By the way I think there is one more kit left in the shop. 😀

[john stones 1 - Moderator]

Absolutely post your build, always a good read Adrian. 👍

[Adrian Smith 1]

Will do, John. I always like other readers views.

[Adrian Smith 1]

Well first observation which had me scratching my head.

 

 

 

Well in my book the stated spec for the servos makes no sense for this size model. Those numbers, and I stand corrected of course, equate to about 8-12 kg/cms servos. The spec should be for around 30kg/cm servos at least! 

Edited November 11, 2022 by Adrian Smith 1

[Adrian Smith 1]

Anyway a look inside the box at the fuselage first.

 

The fuel tank comes fitted, but of course I am taking that out. The construction is of high quality albeit more "engineered" than Extreme flight.

 

 

Belt and braces for the motor wall.

 

Edited November 11, 2022 by Adrian Smith 1

[Adrian Smith 1]

A fair amount of side thrust is built in although I haven't measured it yet.

 

Good to see the cowl prop driver opening is suitably offset too.

[Adrian Smith 1]

I am thinking that to assess the precise length of stand offs I need to do things in reverse order and fit the cowl to the fuselage such that I can then measure from the motor wall to the prop driver exit with accuracy. That's going to be my first job then.

[john stones 1 - Moderator]

One mans servo spec is another mans Ooo'er, go with what puts your mind at ease Adrian.

Yep, big offset for the side thrust, long lump to cater for though.

[Adrian Smith 1]

Yes, John very true. Interestingly the overall dimensions of the Dualsky GA8000.8 motor are virtually the same as the GA6000.8 (less power). I took a measuring gauge to the diameter of both motors and they are the same. I am now going to check the weight to what the difference is. 

[Adrian Smith 1]

1328 g versus 1140g apparently. When I go to the work shop I will be checking that!

[Adrian Smith 1]

First to clear up the difference between, apart from power, the GA6000 and the GA8000. Dimensionally, the only difference is in the depth of the can as shown on the manuals. This accounts for the weight difference. Therefore no problem to fit the larger motor into a 60cc airframe. I think I will need the extra performance give the Slick's estimated AUW.

 

 

 

Anyway so to work.

Edited November 14, 2022 by Adrian Smith 1

[Adrian Smith 1]

First job then is to fit the U/C legs on giving the fuselage a resting point when I fit the motor. A dab of blue thread lock on the nuts. The access within the fuz is adequate even for my clumsy hands.

 

 

[Adrian Smith 1]

Next is to test fit the cowl. Helpfully there are some sticky strips to allow for accurate drilling of the cowl. I also put masking tape on the cowl to stop the drill bit "skating" on the material.

 

 

 

The cowl I must admit is not the greatest fit in the world, but with a bit of adjustment should be ok.

[Adrian Smith 1]

Measuring from the motor box to the cowl's prop driver outlet suggests the overall distance is 170mm.

 

Well that's a coincidence as the motor plus the standoffs suppled seemingly will fit just right. I will see.

[Adrian Smith 1]

Next I drew up a template for the mounting holes to be drilled into the motor box wall.

 

 

Transferred to the model and taped.

 

[Adrian Smith 1]

Holes forM5 bolts drilled and motor plus standoffs fitted.

 

 

No for the nervy bit - seeing if the cowl fits correctly.

 

 

Phew! What a result. Prop driver sits about 2mm proud outside the cowl which is what I am aiming for.

Earn't myself a tea and a couple of short bread biscuits.

[Adrian Smith 1]

I took delivery of a nice JP 4" spinner with an alloy backplate.

 

I initially thought I have made a "ricket" as the backplate is not totally solid. I needed to have a backplate that can be drilled to accommodate the 4 bolts that fit through the prop to the prop driver.

Well on closer inspection the prop facing plate is smaller than the hub on the prop back plate. This will allow me to drill out the 4 M5 holes required.

 

 

[Adrian Smith 1]

In the meantimetime on to prepare the horns for the working surfaces. The bottom of the horns needed to be scored for the glue.

 

Also some of the film needed to be cut away such that the horn base will stick to the wing rather than the film. All basic stuff. The slots in the wing are sufficiently well cut such that the horns slot in without and remedial work.

 

 

 

The ailerons and elevators are essentially the same fitting. The rudder horns are for a pull/pull system (rear push rod setup also catered for) and are all in one.

All these these fittings are going to be glues with gorilla glue.  Now where have I put that pot ...........? 🙄

 

 

 

Edited November 17, 2022 by Adrian Smith 1

[john stones 1 - Moderator]

Nice fittings Adrian, hinges look very good, they have a makers name ?

[Adrian Smith 1]

Yes John, fittings seem to be of reasonable quality. As to the hinges most of the accessories provided are Kuza make although I am not convinced the hinges are. When i visit the workshop in the next couple of days I will check and post here to answer your question.  Leave it with me. 

[Adrian Smith 1]

Something similar I noticed are by Pilot RC, but as I say I will have a look.

https://www.pegasusmodels.co.uk/product.asp?type=submenu&dept=5&maingp=Aircraft&prodid=1016484#.Y3aOti-cZBw

[Adrian Smith 1]

Waiting in for the Courier day today. I managed to source some Gorilla glue from my local Jewson's in Woodbridge too.

I went back to RapidRC Models for 5 servos. They are all 31.5 kg.cm at 8.4v which is fine as I will be using a separate 2S RX lipo. 

 

I did consider a lower torque servo, but there wasn't much in the 20-25 kg.cm range at a sensible price that is HV digital. I have used these Macgregor servos before and they are very reliable. I did use 31 kg.cm servos on my 60cc Sbach electric conversion although I used Savox 1270TG's. However, these servos are now re-catergorised apparently and are nearly twice the price of the original! I try to buy as good a servo that I can afford purely because I don't want lose an expensive model through servo failure. 

 

[Adrian Smith 1]

I sourced a 26x10 prop from Modelshop Leeds which is a Foxy brand. This was at the lower end of prop recommendations for the Dualsky motor I am using.  I will have drill out the prop hub and spinner back plate to match the 4 bolts on the motor. There also looks to be a good chunk of spinner to be Dremmeled out for the prop blades. so Lots to do at my next work shop visit.

Edited November 19, 2022 by Adrian Smith 1

[john stones 1 - Moderator]

Never heard of Foxy props, be interested on your opinion when it's flown Adrian.