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Hangar 9 Ultra Stik 10cc

A handy flyer for practice and first experience with a petrol engine.

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Colin Leighfield12/08/2019 19:47:47
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5952 forum posts
2492 photos

607aecb5-2d76-4c2f-9f25-78d6a0bede24.jpegWhile slightly indisposed because of my coming off worse against a Brewster Buffalo, I have occupied myself by putting this together. I just have the engine to install now. Reasons? I wanted a relatively large easily visible and robust sports plane to improve my flying skills. Also I wanted to have some experience with a petrol engine. I took to heart Bob Cosford’s observations after flying his Mustfire with the Evo 61 petrol that it wasn’t really worth the bother, taking everything into account. I still want to try for myself though and thought5c605282-a7fc-4573-8e4d-bb988fdddcf5.jpeg the best way would be a simple ARTF designed for a petrol engine. The Ultra Stik is exactly that, although designed around the Evo engine while I have bought the current version of the RCGF 61, slightly different. I’m aware of the concerns about noise with these motors, so will use an extension and secondary silencer.

Tom Sharp 212/08/2019 21:20:14
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3526 forum posts
18 photos

Hi Colin

Ultra Stick

Two things to watch,

The wing mounting plate, where the two plastic bolts engage, is known to be poorly glued to the sides on some examples and can depart along with the wing, resulting in sever ground damage.

Make sure the tail plane is securely attached to the fuselage as it is mounted very low and can catch in the grass on landing and risk twisting it off.

Otherwise a fantastic plane.

On the Futaba site there is a suitable set up for the Ultra Stick for their FF9 transmitter, this gives full crow brake settings etc.

Colin Leighfield12/08/2019 21:31:33
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5952 forum posts
2492 photos

Tom, thank you, carefully noted. At first inspection it all seems to be well glued but I will take another look at the wing mounting plate. I have epoxied the tailplane, so fingers crossed.

Bob Cotsford12/08/2019 23:43:22
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7984 forum posts
444 photos

I replaced the 1/4-20 threaded plastic inserts with good, British standard (wink ) 6mm captive nuts on my H9 US 10cc as one of the inserts stripped. It was tight to start with, the bolts were hard to turn even after easing the holes in the wing.

I may have pushed the boat out a bit far on the power front, a Power 52 motor that I had lying about, an FrSky Neuron 80A esc and 6S 4000mAhr Lipo giving me 1400W to play with.

Apart from the wing bolt issue I've found it to be an excellent piece of kit both in terms of fit/finish and flying.

Mix the flaps in with ailerons for roll rate at low speed, mix the ailerons with coupled flap/elevator for silly loops and full span flapperons, crow brakes to stop it dead - it's a brilliant model for safely playing with mixing. The only thing that lets it down in the air is the coupling in knife edge, it's just plain hard work. On the other hand it's extremely tolerant on balance points, mine came out in the middle of the acceptable range after adding an oz or two of lead in the nose and it's so stable I intend to take some of the lead out.

Ali suggests .46 power and up so 10cc petrol should be fine. If one that has similar power characteristics to the Evolution that I had than a 13*6 prop should do the job.

 

Edited By Bob Cotsford on 12/08/2019 23:45:59

cymaz13/08/2019 06:29:27
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8670 forum posts
1177 photos

Have you money in the budget for a good silencer. Any small 2 stroke can be very loud.

Tuning a petrol engine is very different to a glow. Once the engine has done something running, throw out the unbranded plug that arrived with the engine and put a ngk in.

Colin Leighfield13/08/2019 07:06:48
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5952 forum posts
2492 photos

Bob, thanks for that, nice to know that you have one of these! The nylon inserts for the wing bolts seem ok, the bolts turn inside them easily and screw all of the way in with the wing off. I’ll take a good look though to see if anything is “iffy”. The advice on settings is also appreciated.

Cymaz, thanks also. As mentioned in the first post I’m conscious of the noise risk so am extending the exhaust into a secondary silencer. I have ordered the 60/120 size secondary from Just Engines and think that should do it. I note Bob’s suggestion of a 13”x6” prop, I might even kick off with a 14”x6” to keep the revs down, then take it from there. I’m not out for ultra performance anyway, just a reliable and robust regular flyer and petrol engine experience. I will get hold of an NGK plug as you recommend, I have used them in bikes for years and had good experience.

Denis Watkins13/08/2019 08:38:25
3884 forum posts
60 photos

I did the same thing from JE Colin, and fitted using these clips of ebay, as they offer some insulation

cb19999-40_1.jpg

Colin Leighfield13/08/2019 09:47:37
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5952 forum posts
2492 photos

Thanks Dennis, I’ll have a look at those. Just got an email from JE to say they have refunded because not currently available. Wonderful! I have already got the smaller version but the outlet looks a bit small for this engine. More head-scratching.

Don Fry13/08/2019 10:21:15
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3955 forum posts
42 photos

Denis, what are those clips called?

Denis Watkins13/08/2019 10:45:05
3884 forum posts
60 photos
Posted by Don Fry on 13/08/2019 10:21:15:

Denis, what are those clips called?

Don these, are cheap too

P-Clips 304 Stainless Steel Rubber Lined Pack Qty's 1, 2, 5, 10 P Clip Clamp W4

Don Fry13/08/2019 11:07:16
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3955 forum posts
42 photos

Thank you Dennis, ordered, and a problem solved

Kim Taylor13/08/2019 17:50:39
280 forum posts
53 photos

Try one of these:

**LINK**

I've put one on to my Wot4XL/NGH GT17 and found that it cuts the 'bark' right down, as well as 'silencing' a bit.

It's the one shown in the current RCM&E feature on silencing petrol motors.

I used a length of stainless steel flexi tube, joined with silicon tube to the engine at one end and the above silencer at the other.

Kim

ps Liking the look of the Stik - maybe one for the future - I'm fed up with Wot4's, even if you can get hold of them!!

Edited By Kim Taylor on 13/08/2019 17:53:29

McG 696913/08/2019 17:59:01
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2547 forum posts
977 photos

... isn't your Fury build taking some 'delay' then, Colin? ... devil

Cheers, young man wink

Chris

Colin Leighfield13/08/2019 22:48:29
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5952 forum posts
2492 photos

Kim, thank you for that. I have just read the article in RCM&E as well. I like the look of the Stik too, just a simple no-nonsense flyer and I take the point that it could be a substitute for the Wot 4! Somewhat up-market.

Hi Chris. It’s the time of year really and so much going on, not to mention my relative indisposition in the last few days! The Ultra Stik is a minor diversion and part of re-thinking what I fly to improve how I do it. The usual over-optimism of “knock it together in a day or so” looks more like a week, time has been wasted because of the complications of fitting the rear induction RCGF motor instead of the front induction Evo, but I’ve cracked that today

i’m happy with where I am with the Fury, getting the wings done made me happy and there are no imponderables as there have been with the Chipmunk, which I have also looked at again in the last few days. I was supposed to be in France this week on the Honda, but the damage to my arm meant I had to postpone, but I managed to move the whole thing, ferry crossings and hotels, by two weeks so I will be heading for Brittany in a few days. That will delay building by a bit more, but it's me being me and disappearing on the bike is something I like to do.

Colin Leighfield02/09/2019 22:07:11
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5952 forum posts
2492 photos

d880ea93-88d3-4aaa-9a72-7da7ea03e575.jpegf8e468d1-ce58-4e20-9696-dd6726bf4f45.jpeg96ca5693-9088-4c06-be5b-fd4b4e716f6e.jpegIn spite of Tom Sharp pointing that this plane is the “Ultra Stick” and not “Stik”, I note that I continued to repeat the mistake afterwards. Sorry Tom. Sadly I don’t know how to correct the spelling in the header, if any passing mod can advise it would be appreciated.

Now that I’m back in action I need to finish this to clear the space in the shed to get on with the Fury. It is a well made artf, but there is still a lot of work in setting it up. I have the radio sorted and the engine ignition set up. One of the toggle switches on the tx is acting as an ignition switch through an auxiliary channel and a Rexcel Opto engine killer. All of the flying controls and throttle are working. Also I have fitted a rev counter.

Because of the rear carburetter on the RCGF motor the engine sits slightly further forward than the Evo shown in the instructions. I have got this sorted out but it looks as if the c of g will be a bit forward of recommended as a consequence. To off-set this I have mounted the 4.8V ignition circuit battery at the back of the radio bay. Final judgement on c of g will be made after all of the detailed work is complete.

Rather than wait and find out that the engine is noisy I have worked on the basis that it will be. Therefore corrective action includes using the Dremel with a cutting wheel to cut two “V-notches” in the exhaust pipe and then hammer it into a 90 degree bend. I have pushed a flexible plastic extension pipe over the curve and will feed that into a secondary silencer. The best answer to reducing noise without excessive restriction is loads of volume. I have two options, I can’t remember where I got either of them and they’ve never been used. One I think is probably from JE, it looks like their 60 sized secondary and could be ok, but the outlet looks a bit small. The radical approach though would be to use the “tuned pipe” contraption, which is rather large but has loads of internal volume and good sized outlet. I actually think that it would look ok on this plane as well.Does anybody have an opinion?b84fb491-e2bf-48a0-aa2b-abb2350855c4.jpeg

Bob Cotsford02/09/2019 22:32:31
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7984 forum posts
444 photos

I used similarly styled tuned pipes on 61-90 2 stroke glows and found them to be very effective, for example an MVVS 90 was tested at 79dBa on a 14*8, I don't know the rpm but I'd guess around 8k. IIRC I used a 24" length for the pipe from the cylinder centre to the estimated max diameter of the pipe. I never did tweak it for maximum revs as it had plenty of power and good manners from the off. I once had a calculator for revs/timing/length but it was one I found on the internet.

The little tubby can does looka bit restrictive frown

Colin Leighfield02/09/2019 22:42:14
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5952 forum posts
2492 photos

Thanks Bob, your opinion supports my thinking that the “tuned pipe” will do the trick. I actually think it could sound quite nice and should remove all of the “crackle” from the exhaust note. I’ll have the engine running this week, I’m looking forward to it. I should be able to fabricate a supporting bracket and fix it using the three undercarriage attachment bolts.

John Stainforth02/09/2019 22:56:36
310 forum posts
38 photos

The Ultra Stik was not designed around a gas engine: it came out way before gas engines became the new fad. In the US, Ultra Stiks and Great Planes Stiks (there's not much to choose between the two) are equivalent to the UK WOT 4's, and are at least as good. The classic weak spot of the Stiks is the rear fuselage because it tapers to a very narrow cross-section just in front of the tailplane, at a point where there are slots for the elevator and rudder push-rods. If the balsa in the rear fuselage is soft, there is a real chance that you could lose your plane to flutter. In the US most people beef up the rear fuselage of their Stiks with extra plywood plates etc, particularly when they put more powerful engines up front (usually, still glow, not gasoline).

Colin Leighfield02/09/2019 23:08:21
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5952 forum posts
2492 photos

John, this current version is designed for 10cc petrol as well as electric or glow and is actually shown on the box and in the instructions with the Evo 60 petrol. Also the Horizon Hobby video shows Ali Maschinsky flying it with the Evo, with electric and a with a Saito three cylinder radial! Ali describes the background to it. There are a number of changes compared to earlier versions. Have a look at it on-line and see what you think. I bought it because I searched on-line for an ARTF for 10cc petrol and it came up immediately.

John Stainforth02/09/2019 23:23:05
310 forum posts
38 photos

Yes, it's a very versatile airframe that has not changed much over the years, and I am sure it would be equally good with glow, electric or petrol ("gas" power plants.

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