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Extra Hot Chilli

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Chris Freeman 305/08/2019 07:39:24
235 forum posts
305 photos

I recently had my 55th birthday and decided a fast car or young lady was not what I wanted so I decided that a nice sport twin whould help get the blood flowing. I have taken the plan of the Chilliwind downloaded from Outerzone and enlarged it to a fuselage length of 1.8m and a wingspan of 2m. This will form the basis of the build and the rest will be done as we go along. The wing will have flaps and retracts. Power will be 2 original ST 90's that are about 30 years old, one is still brand new in the box and the other has had around 15 flights. I cut my own foam cores and my patient wife helped me with this. She did complain that my side of the cores are not as smooth as hers.

Wings and stab have been sheeted with 2mm balsa applied with latex glue. The fuselage is being joined in the jig and will be long and sleek.

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Chris Freeman 305/08/2019 07:41:31
235 forum posts
305 photos

I was very tempted to use some cores that I had cut for a Spitfire but decided against it as the tips are very thin and I did not feel like cutting new cores.ct5.jpgct6.jpg

Bob Cotsford05/08/2019 10:28:22
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7930 forum posts
436 photos

Twin 90 2 stroke motors Chris? That should be one hot pepper!

Nigel R05/08/2019 11:01:43
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2985 forum posts
471 photos

Watching with interest!

Ace05/08/2019 11:53:39
262 forum posts
15 photos

Watching as I do like a nice twin. thumbs up

David P Williams05/08/2019 12:15:38
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836 forum posts
282 photos

My Dual Ace 70" span is pretty quick on an old pair of 52 four strokes - I think your two 90s will be ballistic laugh

Peter Miller05/08/2019 13:40:47
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10076 forum posts
1192 photos
10 articles

I would suggest wearing your Pampers on the first flights!!!!

alex nicol05/08/2019 13:46:43
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285 forum posts
13 photos

Watching with interest. By coincidence I maidened my Chilli Wind yesterday and absolutely loved it.

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Chris Freeman 306/08/2019 07:45:03
235 forum posts
305 photos

One of the motors was originally used on a Bud Nosen Cessna 310 over 25 years ago. The 310 had a 10 foot wingspan and was a little marginal on take off but was great once in the air, I am sure it will find the Chill a breeze in comparison! Part of the reason of doing this project is to re learn the set up of twin engines as most of my recent projects have been electric so it will be nice to get this done. My son and I have a few projects that need to be finished and we need to get the confidence to use glow motors as electric on a big twin is expensive and a bit of a cheat in some ways. We have a Bodo DC3 that was crashed 30 years ago that can be fixed, a esm DC3 anda ESM B25. Throttle management will be important on this plane along with good hinging, servos and pushrods. We have a big Heinkel that is electric but it is seldom flown, a pain to transport and get all the lipo's charged.

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Chris Freeman 312/08/2019 06:09:57
235 forum posts
305 photos

We had a bank holiday on Friday so I managed to go flying twice and get some building done, Saturday was a good building day as it was cold and windy. The wings were cut for ailerons and flaps and the leading and trailing edges added. Mounts for servos done and retract mounts made. I made up ply sub ribs to give strength to the mounts as the loads will be quite high on our rough grass runways.

I have also done some work on the fuselage and started making the parts for the nacelles.

Chris Freeman 312/08/2019 06:14:20
235 forum posts
305 photos

And now the pictures, I always forget to update the album

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Chris Freeman 312/08/2019 06:14:57
235 forum posts
305 photos

More pictures

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Nigel R12/08/2019 10:31:43
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2985 forum posts
471 photos

Looking good, some quick progress there.

Flaps are to be standard 'plain' flaps?

Have you any idea what the all up weight is likely to be?

Chris Freeman 312/08/2019 11:04:00
235 forum posts
305 photos

No Idea on the weight yet, I am not one to try and build to an exact weight. I use the wood needed for the task and you will see that all my balsa has its weight on the sheets so that I can select the wood that I need. The flaps will be bottom hinged, much like a Mustang. I have found them easy to do and work well on a wing like this.

I am very lucky to have a large workshop with 4 work benches so I can work on 1 piece whilst the other is drying and I also tend to be a fast builder.

Nigel R12/08/2019 11:38:42
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2985 forum posts
471 photos

Are you intending on doing anything fancy with the throttles, any special mixes or so forth to keep one engine at idle while you can start/run/throttle the other, or a differential mixing for taxying?

Chris Freeman 312/08/2019 14:23:15
235 forum posts
305 photos

No special mixing will be used, I plan to keep it as simple as possible in the beginning, the 2 throttle servos will be on a y lead but I will be able to use mixing if needed. It is very easy to over complicate things that I find can cause a problem when a situation arises.

Nigel R12/08/2019 14:31:39
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2985 forum posts
471 photos

I agree.

If you don't have a feature, you can't use it wrong!

Chris Freeman 315/08/2019 06:01:48
235 forum posts
305 photos

I have started mking the wing tips, I start with a ply skid that extends quite a bit below the wing that protects the tip and also the servos in the event of a retract failure. I have used this a few times on other aircraft I have built and all had good low speed handling so it may even assist in this area. The tip design was done on the wing and not on the plan so I make it up as I go along.

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The Nacelle is also done in much the same way and is progressing well.

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Chris Freeman 326/08/2019 05:59:11
235 forum posts
305 photos

Progress continues, the wings have been hinged, servo lead channels melted in the foam and then joined. The wing center has been glassed along with the stab. The fin and rudder have been made, they are quite a bit larger than shown on the plan. I have now made one cowl and it makes the nacelle look long but I did not want to cut into the wing for the tank so that was the determining factor to the length of the nacelle. I need to start to do the servo mounts and pushrods so that the fuselage bottom can be closed.ct11.jpgct12.jpgct13.jpg

Chris Freeman 311/09/2019 06:44:14
235 forum posts
305 photos

The progress has been good and I have now started to cover, I have used what I have in stock so the covering is Oracover, Orastick, Hobby King, Solarfilm Polyester and Monokote! Not as many colours as it sounds. I forgot how nice the Solarfilm was to use, it is most of the red covering. I had a whole roll that was about 20 years old but still works well.

I also managed to get a whole heap of Futaba servos second hand it better than great prices and was given a couple of OS 2 Strokes that had been slightly damaged in prangs and will be buying 60 and 95 second hand to give me a few options on motors if the ST 90's give any problems. I always manage to forget to update the album and will have to post pictures later.

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