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Electrifying Top Flite Stinson Reliant

Info & build thread

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Stearman6525/08/2018 12:43:53
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I've bought a Top Flite Stinson Reliant kit & will be powering it with an electric motor, the model should come in around 20 to 23 pounds. It has a 100inch wing span & a clark Y ish section. Has anyone electrified this kit or something similar. Looking for possible motor ESC & Lipo sizes.

Stearman6530/08/2018 17:33:12
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I've since subscribed to ECalc & calculated a few alternative set ups, & found a site where there is a full build of the Stinson with pictures. He wrote he had used the AXI 5230-28, but when I checked the AXI site there wasn't such a motor. I also downloaded the build pictures which contained a couple of shots of the motor which was an AXI 5320-28question. I put the model details into AXI's calculator & came up with something entirely different (larger). So I'm totally confused now. The search goes on.

It's some time since I built a model of this size & was pondering on the wheels, there are in spats so need to be fairly narrow. The size on the plan is 5" & 2".

I used Robart on my PT17 & wondered if something new had come onto the market suitable for grass or tarmac? http://rcmodel.com/category/building-the-stinson-sr-9/

 

 

Edited By Eric Shepherd on 30/08/2018 17:34:06

Ikura30/08/2018 18:07:45
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I would have thought the AXI 5320-28 would struggle to even taxi it let alone lift it.

Stearman6530/08/2018 18:13:42
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Posted by Ikura on 30/08/2018 18:07:45:

I would have thought the AXI 5320-28 would struggle to even taxi it let alone lift it.

Hi

What do you base your statement on? Have you looked at the site?

Tom Sharp 230/08/2018 18:30:24
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Hobby King do some suitable motors for 20lb to 30 lb models. Only around £120 to £150 each.

Stearman6530/08/2018 18:45:44
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Can you supply a link to the model of motor. I had an AXI motor previously, their wizard comes up with a differnt selection altogether than the one in the build thread.

Ikura30/08/2018 21:01:12
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Posted by Eric Shepherd on 30/08/2018 18:13:42:

Hi

What do you base your statement on? Have you looked at the site?

I based it on what size motor it takes to fly a Proctor Antic Monoplane at 6.5lbs and the Stinson is going to come in at 11kg + so I struggle to see how an Axi 5320-28 is going to propel a model that size.

You have a 11kg model with a 118g dm² wing loading so it is going to take a massive amount of power to haul it around.

Not trying to put you off building it for electric power, just being realistic in what you are going to need to fly it.

J Moyler30/08/2018 21:54:27
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56 photos

I am sure some one else will come up with a suggestion for a motor. From my experience I would like about 100 watts per pound weight. So I would look for a two kilowatt motor. 4 max do one which you can run on 10S using 20x10" prop

Link

4-Max also have a guide to select a brushless motor Link

Hope you find this useful.

JM

PS Just found some information on an AXI 5320/28 Link. This says max power is 1850 watts which will fly the plane. I have flown a 80" Piper cub on 70 watts per pound but prefer to have a bit of power in reserve.

Edited By J Moyler on 30/08/2018 22:00:42

Biggles' Elder Brother - Moderator31/08/2018 04:07:48
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That 4-max motor can handle current bursts upto 85A, at 10s that's over 3kW. So it certainly has the beans! Proped for, say 2.2kW or there abouts, it would do the job nicely I think. And a good price for such a big motor.

BEB

Stearman6531/08/2018 07:29:11
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This is what AXI come up with when you put 22 to 25lbs into their wizard. They don't specify a scale model, so I've used a trainer as the base as it wouldn't be doing any aerobatics. Thanks for the comments.

https://www.modelmotors.cz/product/detail/253/

Chris Freeman 331/08/2018 09:29:04
142 forum posts
156 photos

Great project with lots of building, look forward to the progress with this. If I recall correctly a Quadra or US engine is shown on the plan which is a old chainsaw motor of around 33cc and about 1.2hp. I once asked a question on another forum if all watts are created equal as I flew a BT P47 on a Turnigy 5065 on 6 cells and it flew very well with 1300 watts on a 20x10 prop. Performance was better than what the figures would indicate and I thought that this was due to the larger prop spinning at a lower RPM being more efficient.

Back to the Quadra on the Stinson plan, a good 40 can produce 1.2 hp, a good Ducted fan 90 would do over 6hp but would not fly the Stinson so you need to see what prop you want to use as well.

Stearman6501/09/2018 10:41:01
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629 forum posts
738 photos

Hi Chris

My kit's instruction book suggests the following IC motors17.7 to 32.6cc 2 stroke, 19.7 to 26.2 4 stroke & 25 to 35cc ignition, which I believe is petrol 2 stroke. The test model was flown with an OS FT-160 twin with a model weight of 22lbs.

Went to Ikea yesterday & picked up a table to build on & some storage shelves. I'm building this model under the bedroom window in a very restricted space, we live in a 1 bed-roomed apartment so I will have to be ultra tidy. Just need some ply for the table top as the surface won't take pins.

Ikura01/09/2018 13:24:23
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270 forum posts

Plasterboard is one of the best building surfaces there is and it's very cheap. It takes pins very well and with some florist cellophane over the top you are ready to start building.

B&Q do 1200mm x 600mm sheets of platerboard but you will probably need larger sheets, which they also sell. I believe the larger branches will also cut it to size.

Good luck.

Stearman6501/09/2018 18:08:06
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629 forum posts
738 photos
Posted by Ikura on 01/09/2018 13:24:23:

Plasterboard is one of the best building surfaces there is and it's very cheap. It takes pins very well and with some florist cellophane over the top you are ready to start building.

B&Q do 1200mm x 600mm sheets of platerboard but you will probably need larger sheets, which they also sell. I believe the larger branches will also cut it to size.

Good luck.

That's a new one on me?

Ikura01/09/2018 19:15:16
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270 forum posts

Try it, it's great stuff for model building.

B&Q are about £4 for a 1200mm x 600mm sheet so not expensive to try.

Stearman6501/09/2018 19:36:19
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629 forum posts
738 photos

How about when you have a curved stringer does it hold a pin vertically?

Ikura01/09/2018 20:27:46
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270 forum posts

I am building a thermal flying wing which has a curved leading edge that is glued to the ribs under tension and pins into plasterboard hold that just fine.

Having also built many intricate wings and fuselages on plasterboard I can honestly say that I would prefer it to anything.

Stearman6502/09/2018 07:23:07
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629 forum posts
738 photos

On your head be it, you've persuaded me to give it a try, watch this space.thinking

Rich too02/09/2018 08:25:46
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2854 forum posts
1042 photos
Posted by Ikura on 01/09/2018 13:24:23:

Plasterboard is one of the best building surfaces there is and it's very cheap. It takes pins very well and with some florist cellophane over the top you are ready to start building.

B&Q do 1200mm x 600mm sheets of platerboard but you will probably need larger sheets, which they also sell. I believe the larger branches will also cut it to size.

Good luck.

+1

Stearman6502/09/2018 08:42:01
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629 forum posts
738 photos
Posted by Rich too on 02/09/2018 08:25:46:
Posted by Ikura on 01/09/2018 13:24:23:

Plasterboard is one of the best building surfaces there is and it's very cheap. It takes pins very well and with some florist cellophane over the top you are ready to start building.

B&Q do 1200mm x 600mm sheets of platerboard but you will probably need larger sheets, which they also sell. I believe the larger branches will also cut it to size.

Good luck.

+1

That's another new one "Florists Cellophane". I used to use clingfilm, more investigation needed. Thanks.

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