small F-86 sabre

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Theuns v V
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small F-86 sabre

Unread post by Theuns v V » Sun Apr 14, 2019 1:17 pm

I got hold of this kit last year and thought it might make a nice easy project as a break from the complex P-51.

It is an unknown early 1980's era kit , the glasswork will need allot of filling and sanding to get smooth. The foam/ba;sa wings and tail is actually quite nice and light. I like the loads of wing area that it haswith nice large flaps.

I want to build it for a 4-6 kg turbine setup. I have a 90mm EDF but the scale nose is only 70mm diameter so I am not entirely sure that the intake duckt that will be quite long will work for the EDF on say 8 cell setup. It might be restrictive.

I have heard that they slope very well also....but that would be a waste of such a nice looking aerie :wink: :wink: I need to still see how much space a turbine setup will take, there is enough space on the CG to put 2L of go juice.

I will not do full cockpit stuff ect, just a simple to operate, nice to fly and most important cheap to outfuit aerie

T
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Re: small F-86 sabre

Unread post by Tomcat1 » Sun Apr 14, 2019 1:25 pm

Connected to this build :wink:
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Theuns v V
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Re: small F-86 sabre

Unread post by Theuns v V » Sun Apr 14, 2019 1:50 pm

net soos n spitty is die shape net reg =D>
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Re: small F-86 sabre

Unread post by fly scale » Sun Apr 14, 2019 4:08 pm

Gaan mooi wees, weet dit

FS
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Re: small F-86 sabre

Unread post by Theuns v V » Mon Apr 15, 2019 6:44 am

I had a very long hard look at this FG fuselage. It is the old 1980's pollyester resin that is quite brittle and they used is very coarce . Having to fill ans sand smooth this will take allot of primer....this is loads of weight ad to match the extimated 10 Lb flying weight is going to be hard.

So, I will smooth this fuse, correct the twist in the vertical stab and also make the rudder a part of the stab in one piece.
Then I will pull a mold of it. Then I can make much lighter fuselage and simplify the fin setup at the same time, like on the Mirage.

I have been told that these sabres slope very well, I think north cliff will be hard on this aerie, therefore I need to be able to make more :lol:

I also want to experiment with my 90mm 12 blade EDF as a power plant and experimental airframes take a beating :wink:
Also I have not flown jet in a long time so I might need allot of replacements 8-[


T
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Re: small F-86 sabre

Unread post by DeanDJ » Mon Apr 15, 2019 12:30 pm

Engine issues sorted-mentos and coke.
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Re: small F-86 sabre

Unread post by Tomcat1 » Mon Apr 15, 2019 2:29 pm

DeanDJ wrote:
Mon Apr 15, 2019 12:30 pm
Engine issues sorted-mentos and coke.
Just need to turn the "engine" around or she's gonna fly backwards #-o :twisted: :lol:
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Re: small F-86 sabre

Unread post by Theuns v V » Mon Apr 15, 2019 5:50 pm

At 22 ZAR for 2 l coke these days a turbine is cheaper....
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Re: small F-86 sabre

Unread post by Peter Connan » Mon Apr 15, 2019 6:39 pm

Jy is jou eie ergste vyand, maar die res van ons score elke keer!

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Re: small F-86 sabre

Unread post by Theuns v V » Mon Apr 15, 2019 7:02 pm

Net so ja. :lol:
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Re: small F-86 sabre

Unread post by Theuns v V » Fri Apr 19, 2019 4:37 pm

I wanted to see if the 105mm and 90mm 12 blade chabge sun fans might work for this jet.
The 105 has a FSA of 55% inlet ring and the 90mm has a 66% inlet ring ....this is gong to be a problem as I need a min of 80% inlet of the fan face :(

Even if I keep the inlet ring at it's 70mm diameter size and increace the middle of the inlet duct to the correct size of the fan, the influx air will have a pressure drop as it slows down...I have no idea how this will affect the fan performance but my logic tells me it will do so advercely.

Any EDF experts with ideas other than having to bucther the entire nose??

T
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Re: small F-86 sabre

Unread post by Seank » Fri Apr 19, 2019 8:25 pm

Hey T, that looks like a copy of the BVM fuselage, and mine has a 100mm fan, and they fly better then anything I have ever seen on a 100mm.

https://youtu.be/smRozw3XfUk

Leave the nose, it will be fine, I molded a duct to suit a 100mm fan.
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Re: small F-86 sabre

Unread post by Seank » Fri Apr 19, 2019 8:29 pm

Actually consider this, the original BVM sabre flew on a 5" or 125mm fan. They flew beautiful.

It's static thrust vs Dynamic
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Re: small F-86 sabre

Unread post by Theuns v V » Sat Apr 20, 2019 7:29 am

Thanx for the link Sean. I see that aerie has a good ballance between static and dynamic for scale flight.
The JHH f 86 has a cheater hole under the fuse and the inlet duck stops a few inches shprt of the fan .

what thrust/power does your edf make and on how many cells?

I would like to se if the 90mm 12 bade chengesun could handle 2 by 4 cell lipos and still make enough thrust. On a single 6 cell it made 2,7 kg static in a CMP Hawk and the intakes on that are not all that good.

The 90 will be lighter than the 105.

How is the shape of your full inlet duckt? Does it taper gradually from the inlet ring to the fan fase or does it have a milk bottle shape ?

What about your outlet duckt? about 80% of inlet?

Where is your fan located in the plane? I have seen that EDF generally has short uotlets and they sit in the tail, but I need to keep the CG inmind...

T
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Re: small F-86 sabre

Unread post by Theuns v V » Mon Apr 22, 2019 9:24 am

After allot of googling t seems my 90mm edf will not make enough thrust on the max 6 cell lipos the guys say it can handle.
So, I am left with the 12 blade 105mm on 12 cells that in theory makes 5kg pluss thrust.

Needless to say the maths of the intake size to fan ratio shows that I dont have even near enough inlet to have a full duckt to the fan face. Even with some forward speed it will be restricted I believe.
Thus maens that I will have to have a cheater hole in the bottom of the wing centre section to allow for more airflow, maybe not a nice looking as a super clean airframe but even JHH and others have to do this to get the high performance edf to breath efficiently. It may also help with cooing the ESC and lipos in such a very tight fuselage.

I have also heard form a few okes in the know that the sabre makes a very nice PSS so after I make the molds for the fuse, wing and tail I will make one to go chuck off a slope and see how it glides. Then I can play arround with the power train setup.

T

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