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6 Turning 4 Burning

A scratch built project,

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SR 7121/01/2020 16:42:36
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342 forum posts
90 photos

About to start a new build project 6 turning and 4 burning, these are reference the engines

It will be a slow scratch build in my new hanger, as i have returned after many years to the uk from sunny Cyprus, i must be MAD

Nigel R21/01/2020 16:46:07
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3407 forum posts
524 photos

That you are!

Sounds interesting - not much around with that configuration.

Jon - Laser Engines21/01/2020 16:56:03
5101 forum posts
219 photos

Its a monster. Look at that cute little B17 parked in front of it!

J D 821/01/2020 18:22:03
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1357 forum posts
78 photos

Have you been watching "Strategic Air Command" with James Steward. Love the film take off sequence.

Peter Miller21/01/2020 18:25:11
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10526 forum posts
1246 photos
10 articles

There was one many years ago at Old Warden Scale Day

Don Fry21/01/2020 18:29:05
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4409 forum posts
52 photos

Respect. And Jon, more accurately, parked under it.

Denis Watkins21/01/2020 19:04:09
4081 forum posts
77 photos

I think 4 strokes could be difficult to source

So maybe 6 ASP21 2 strokes

And 4 Jettex motors in the shrouds

Paul Marsh21/01/2020 19:24:12
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3815 forum posts
1102 photos

Probably electric would be easier on this model. What about using edf's for the 4 burning then turn them off after take off?

Don Fry21/01/2020 19:30:57
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4409 forum posts
52 photos

Paul, I suspect SR71 don't do easy.

SR 7121/01/2020 23:43:34
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342 forum posts
90 photos

Hi Paul, i intend to fit EDFs in the jet pods, but i really wanted 4 strokes in the engines, i dont like silent aircraft, and as a boy of 10/11 years old i used to watch and listen to these birds fly over the village i grew up in, the sound was so distinct and different to anything else, way up high and moving so slowly you could watch them for ages before they were out of sight

SR 7121/01/2020 23:43:35
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342 forum posts
90 photos

Hi Paul, i intend to fit EDFs in the jet pods, but i really wanted 4 strokes in the engines, i dont like silent aircraft, and as a boy of 10/11 years old i used to watch and listen to these birds fly over the village i grew up in, the sound was so distinct and different to anything else, way up high and moving so slowly you could watch them for ages before they were out of sight

Andy Stephenson22/01/2020 00:10:10
44 forum posts
1 photos

SR71,

dag241 on RCGroups tried to make a giant scale B-36 but if I read his posts correctly he gave up in the end after spending inordinate amounts of time and effort. May be you should wade through his 900 odd pages of posts to see where he went wrong, I think it came down to just making it too big to take the strain...

https://www.rcgroups.com/forums/showthread.php?933242-257-B-36D-Scratch-Build-6-a-turning-and-4-a-burning&highlight=b36

Have fun.

A.

Former Member22/01/2020 01:15:53
3578 forum posts

[This posting has been removed]

SR 7122/01/2020 09:23:37
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342 forum posts
90 photos

Hi Andy,thanks for the link, maybe i should not look at it, might put me offwink been one of my want to build projects since a boy

Trevor Crook22/01/2020 09:42:07
908 forum posts
67 photos

Those wings/nacelles look very slim to hide cylinder heads and silencers properly, so ep would give a better route to scale appearence. Personally, I'd rather have a model that looked right and was quiet and easy to operate. Model engines sound nothing like the full size anyway.

Good luck with this ambitious project. I don't think the early versions had the jets, if you want to make life a bit simpler!

Jon - Laser Engines22/01/2020 10:05:06
5101 forum posts
219 photos

Its interesting that an electric version of this is being touted as more convenient than an i/c version.

Admittedly i only have two chargers, but to charge up 20 batteries (2 flights worth) would take anyone quite a while even with modern fancy chargers. And i am assuming one battery per powerplant and all of the same capacity/cell count to make things easier.

Engines would make the model much quicker to set up as you can charge the rx battery in a very short time and then just go. In a pinch you could even ignore the EDF's and just run the 6 engines. It would prevent having to plan flying several days ahead of time and then being left with piles of batteries to discharge if you didnt go. Its why my electric heli's never fly any more, they are just too much of a pain.

Starting the engines is no hardship if 5 minutes are spent setting them up in the first place, and in the unlikely event one stops you have 5 more!

And sure, a bunch of 30 4 strokes wont sound like a big radial but they would still sound fantastic.

Andy Meade22/01/2020 10:11:07
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2729 forum posts
699 photos
Posted by Andy Stephenson on 22/01/2020 00:10:10:

SR71,

dag241 on RCGroups tried to make a giant scale B-36 but if I read his posts correctly he gave up in the end after spending inordinate amounts of time and effort. May be you should wade through his 900 odd pages of posts to see where he went wrong, I think it came down to just making it too big to take the strain...

https://www.rcgroups.com/forums/showthread.php?933242-257-B-36D-Scratch-Build-6-a-turning-and-4-a-burning&highlight=b36

Have fun.

A.

Yes, Damon's builds are usually a tour-de-force of top-end aeromodelling. From the machining of his own undercarriage, to the manufacture of his moulded nacelles for the EDF's, to making a complete new wing on a whim, the man is a true visionary and craftsman.

Alas, let down by constantly swapping projects and listening too much to "advice" from the internet, this beautiful beast now languishes in the loft of a local pub, iirc.

If you click on "show media only from this thread" link here should work - you can see the development sans the thousands of posts that get in the way -and you'll also see his focus drift from model to model and never finish off what I think was a 15-year planning, design and build project.

Good luck with your build, they are lovely looking machines.  One I've planned in "large" scale for the slope for a while yes

Edited By Andy Meade on 22/01/2020 10:13:34

Nigel R22/01/2020 10:14:45
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3407 forum posts
524 photos

"It would prevent having to plan flying several days ahead of time and then being left with piles of batteries to discharge if you didnt go."

I think you're overthinking this electric business Jon. Down in the small end of the pool, it doesn't need that much pre-planing.

I leave my packs charged all the time. Yes, lifespan is reduced - a tiny bit. If I didn't have them ready to go, I wouldn't bother with the electrics. This is a no brainer for me with the small cheap 3S3000 kind of size.

A charger with a couple of parallel boards could do all 10 packs in one go, especially in the 3S 3000mA sort of size which would equate to the 30 four stroke level of power.

I use a reasonably priced Hobbyking Reaktor which will do 20A and that would charge up one flight's worth of small packs in one hit - yes that's probably a 90 minute charge but if you double up (or more) on chargers then you're properly cooking on gas.

It wouldn't sound the same as 6 four strokes though!

Phil Brooks22/01/2020 10:37:36
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463 forum posts
148 photos

Why not have a go at the (suggested, but never implemented) nuclear powered version? I'll get me coat.indecision

Denis Watkins22/01/2020 11:06:19
4081 forum posts
77 photos

I dismissed the SC30 4stroke motors, thinking them to be too powerful

Maybe I a wrong

As looking at my notebook, running 2 of these as singles

Give or take fuel at 0% to 5%, and props 9 x 5/ 10 x 5

These little motors can give out 300W based on 0.5hp achievable with prop/fuel

Therefore could 1800W = 18lb AUW ?

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