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Twin glow motors for warbirds?

Advice on choice

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Phil B10/10/2019 15:12:49
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157 forum posts
150 photos

I'm wondering about the feasibility of using twin glow motors around the 15cc size in a large warbirds twin, like the BT 81inch mosquito or the AMS Tigercat. I could go with 2 OS 91FS or 2 Saito 82s. The issue as always is noise. What chance getting below 82db? Maybe 2 Axi 4120s would do but not as nice. Any thoughts please?

Brian Cooper10/10/2019 15:30:39
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449 forum posts
20 photos

Using twin glow engines is perfectly feasible. . Warbirds are not supposed to be totally silent. . And the sound of two engines beating together is just exquisite.

Electric motors have their place, but that place is not on large warbirds.

B.C.

Cuban810/10/2019 15:52:26
2758 forum posts
13 photos

My club's secretary flys a lovely Black Horse Mosquito with twin ASP fourstrokes, 60s I think, might be a tad bigger. As far as I'm aware he's never suffered an engine out, but then he's very diligent with the setting of them and took particular care with their installation. Sounds beautiful and is not at all noisy.

Denis Watkins10/10/2019 16:03:07
3912 forum posts
61 photos

4 strokes, .60 and up are pretty quiet to start with,

Experts recommend against this, but I soft mount all mine and all are below 82db

Ray Wood 410/10/2019 16:16:50
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89 forum posts
9 photos

Brian Taylor flew his 81" Mossie on a pair of Laser 70's I recall.

Regards Ray

Chris Walby10/10/2019 17:41:34
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995 forum posts
236 photos

img-20190610-wa0000.jpg

Seagull with a pair of Laser 70's IMHO what could be better....ok a lottery win a pair of moki's, but the SG goes in the car. Start off talking to Jon at Laser engines and sometimes the wait is worth it.

And it does get through the 82dB noise test smiley

Phil B10/10/2019 19:09:26
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157 forum posts
150 photos

Thanks for all the helpful comments and as expected no strong advocates for electric for warbirds. Chris, what are the Moki's that are desirable? Are they 2 stroke?

Chris Walby10/10/2019 19:47:10
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995 forum posts
236 photos

If I won the lottery I was thinking more of this

**LINK**

Phil B10/10/2019 21:57:49
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157 forum posts
150 photos

Yes I see. I think at 6m wingspan I'd go for something I could sit in and fly for real.

Tim Flyer10/10/2019 22:24:50
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1073 forum posts
194 photos

Twin four strokes are the ultimate Warbird power and the sound is marvellous. They are not common I suppose mainly due to cost. If you build one you will certainly get an audience . I must agree that the sound of two decent 4s engines in a Warbird really positively adds to the impression of the model . I’m afraid electric Warbirds are far less impressive to me.

chris larkins10/10/2019 23:34:54
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207 forum posts
144 photos

A member of my club has an ASM Tigercat with 2 x Laser 100's, sounds lovely and came in under 82db.

VIDEO LINK

Cuban811/10/2019 10:04:25
2758 forum posts
13 photos
Posted by Tim Flyer on 10/10/2019 22:24:50:

Twin four strokes are the ultimate Warbird power and the sound is marvellous. They are not common I suppose mainly due to cost. If you build one you will certainly get an audience . I must agree that the sound of two decent 4s engines in a Warbird really positively adds to the impression of the model . I’m afraid electric Warbirds are far less impressive to me.

To be fair, electric does have its place in the warbird scene, but in what I call 'convenience models'. Smaller, possibly foamy warbirds that often have an appearance and performance and that will be fine as hack models for a bit of fun. Anything decent needs to be IC in my opinion for all the reasons that we've discussed at length elsewhere. No right or wrong with this, it's what works for the individual and what one is striving for.

Chris Freeman 311/10/2019 10:25:48
273 forum posts
355 photos

Either glow or electric work very well, electric is far more reliable. Glow requires constant maintenace to ensure reliability and also you need to take your time on the engine set up to ensure reliability and to know when not to fly when things are not right. I lost a big 120" DC 3 when 1 90 quit in a climb but it was my fault as I had been pushing the limits. My Brian Taylor Mosquito was lighter than the original and easy to fly on electric as you did not have the pronounced swing on tke off with glow motors, The rudder is not very effective at low speed. Choose the right airframe for the motors. Vibration is a lot more on a twin._dsc3386.jpg p1010347.jpg

Scott Edwards 211/10/2019 11:25:58
180 forum posts
96 photos

Pair of Laser 180 singles in this. The fuselage acts as a soundbox and even if I do say so myself, sounds jolly lovely 😁👍

_54a6804.jpg

Manish Chandrayan11/10/2019 11:47:57
595 forum posts
70 photos

What props are you running on the Wellington Scott?

PeterF11/10/2019 11:59:25
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437 forum posts
598 photos

I have a foot in both IC and electric camps with my 81" BT Mossie.

It originally flew with RCV 60SP engines for a number of years although these were at the lower end of the acceptable power spectrum. I had an engine out incident a couple of years back and could not get quite back to the runway and the model landed in the rough pasture about 30ft from the edge of the runway. There was bad damage to the wings so I had to rebuild the wings and after the engine out I rebuilt it as electric power. Interestingly, the electric version weighs 17lb 12oz ready to fly, the IC version weighed exactly the same dry (without fuel).

The RCV SP engines being the geared ones used 16x12 props running at peak 5,500rpm, so I have kept the same large props and chosen the motor KV appropriately. Hyperion ZS 4025-16 320kV motors with 16x12 APC E props driven by 6S 4000mAh batteries through HobbyWing Platinum 80A V4 ESCs. Measurements gave 6,450rpm at 22.3V with 47.5A, so about 1050W each = 2100W = 118W/lb. I am waiting for a gap in the wind and rain to remaiden it.

RCV 60SP engines during original build1431 engines installed.jpg

Motors and ESCs during rebuild1492 motor + esc (custom).jpg

Battery hatch cut into cowl and box1495 left nacelle battery (custom).jpg

Ready to fly again1501 ready to fly again (custom).jpg

Scott Edwards 211/10/2019 12:20:59
180 forum posts
96 photos

ManishChandrayan - Falcon Beechwood 20x6 from these guys ...

https://www.falconpropellers.com/

Manish Chandrayan11/10/2019 12:36:18
595 forum posts
70 photos

Thanks yesScott.

Jon - Laser Engines11/10/2019 17:39:54
4834 forum posts
180 photos

It will come as no surprise that i will always vote i/c for twins. Over the years i have owned 6 multi engine models and am yet to loose one to an engine failure related crash. My first model did suffer a few engine out related spins but once i started ignoring the commonly held views of how to handle a single engine twin and resorted to my current method of flying flat out on the remaining engine to keep the speed up my problems were solved.

While its true that multi engine ic models are a different proposition to a single none of it is difficult and once you get used to it a twin is no more daunting than any other model.

With all that said, i twin trainer of some sort is always a good idea before you go all in on something like a mosquito

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