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Aeromaster

Simplified version of the classic biplane

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Martin McIntosh14/08/2020 21:42:38
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Well, mine is 3.5kg, or 7 3/4lbs including 2oz of lead in the tail end to counter the rather heavy Laser 80. The extra wing servos account for next to nothing and the wood was very carefully selected to be as light as possible, also any ply or blocks which I considered unnecessary were omitted. I must admit that it is rather heavier than anticipated so maybe my luggage scales are telling me porkies but they say that my 1/4 scale Stampe is only 6.2kg which is very much on the light side.

If it was electric it would require much more voltage and battery capacity for the same power and flight time than you quoted. The AUW would probably be the same in order to get the correct cg.

Nigel R14/08/2020 22:31:56
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Trevor

I guess I would look at about 900w for this beastie. Possibly a touch more. I'm mainly going on what I'd consider equivalent to say an 50 to 55 two stroke glow. Biplane are off course quite draggy so will need a fair bit. I find 450w is enough but certainly not excessive on the smaller, 4lb bi-fly 36". That's a near direct copy of the aero master at reduced size.

Martin

I've built my tips. I cut a thin core and sheeted completely with 1/16. I figured rigging would be a country mile easier if I left them off until it was done.

Nigel R14/08/2020 23:19:11
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Trevor that undercarriage change wouldn't even be on my radar....

Anyway. Some more small jobs, they all seem to be small at this stage now... Finished adding resin on the cabanes

20200814_230541.jpg

Looking better than I expected it to.

Also, exhaust is finalised to:

20200814_230807.jpg

Trevor15/08/2020 08:51:49
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Martin, Nigel, Thanks for the informative responses. I've just noticed a typo in my earlier post - both battery sizes I'm contemplating are 4s. The Stearman uses 4s x 3300mah and has enough duration but I do have two pairs of higher capacity 4s packs that don't get a lot of use (they're used in pairs in a BT Thunderbolt), so would quite like to use these if they don't pose any balance issues. Of course the whole issue of battery location and access is another topic that will raise its head quite early in the build!

The version of the plan I'm looking at at the moment is the Super Aeromaster. I don't plan to do the quasi-radial front end but was attracted by the different cabane/wing fixing method whereby the wing is attached to transverse cabane members. It does entail a couple of heavy, grooved, beech blocks in the wings though which doesn't exactly get the weight budget off on the right foot!

Martin McIntosh15/08/2020 09:51:23
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Trevor, have look at my pics and you will see that there are no blocks on the model. The wing underside has some lite ply underneath with 1/16th birch on top for the four wing bolts. Once a test flight was done I permanently fixed the stitching in place with RCM glue with the wings bolted on (tape and Vaseline of course).

Trevor15/08/2020 10:10:09
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Thanks for the reminder Martin. I must admit that having the bolts accessible from the top has a lot of appeal!

Nigel R15/08/2020 20:41:25
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Trevor you could go for a cabane structure like the Bi fly uses. It minimises the amount of wire. There is a Single central connection to top wing with functional outboard struts. It is not too onerous to assemble at the patch.

Nigel R20/08/2020 12:23:49
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20200820_120226.jpg

20200820_120239.jpg

Nigel R20/08/2020 12:27:56
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There she is - finally! A lot of time sunk into rigging the cabane structure and top wing attachment. Everything has come out nice and level, but it took some work to correct a few early mistakes - I really needed to do a better job of jigging when I put the cabanes together in the first place.

A few small tidy up jobs left to do, but essentially woodwork complete and ready for covering... at which point I will have to put the build aside as the tatty old garden shed in which my "workshop" lives, is being demolished, and a replacement must be built frown

Trevor18/09/2020 12:44:05
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It’s all gone very quiet here - I hope all is well with you and your Aeromasters.

Meanwhile my build is now underway, starting with the lower wing. I’ll be documenting this with monthly updates on my website but can post a few pictures here too if there’s still interest in this thread.

Looking ahead to the fuselage, I was surprised to see that, on the Super Aeromaster plan at least, there is no former at the leading edge of the wing. Of course, with a relatively small electric motor, the firewall position is also inappropriate so I’ll have to give some thought to former positioning. Of course, knowing where the battery is going to have to go in order to get the cg right would help, but that’s high up on the list of unknowns too!

Cheers,

Trevor

Nigel R18/09/2020 16:29:01
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Hi Trevor

Taking a bit of a sabbatical from the aeromaster as all my building time is going into this...

20200918_162505.jpg

Nigel R18/09/2020 16:34:41
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4081 forum posts
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I'll be back on this thread as soon as the above building site (or at least part of it) is turned into a nice warm insulated workshop! Lots of my gear and airframes are in storage as you might guess.

Trevor18/09/2020 16:55:37
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Wow, that’s a project on a rather different scale!

Good luck with it. I hope you at least get the roof on in the next week or two.

Martin McIntosh18/09/2020 18:36:35
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How big is it?

Martin McIntosh18/09/2020 18:41:14
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Trevor, I used a light ply former faced with thin birch ply at the front of the wing and a ply tongue; no blocks on mine. You should be able to see this on my pics., in fact no blocks used anywhere.

Nigel R18/09/2020 23:44:19
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4081 forum posts
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Martin, 10x16ft. Plus there is a 9x5 storage shed to move and join on to the side.

 

Should get roof on within next couple of weeks I think. Doing the internal boarding now, roof timber then insulation plus external cladding to follow.

 

I will be very happy to get back to balsa projects after that lot!

Time is of the essence a bit with this one.

Edited By Nigel R on 18/09/2020 23:45:08

Jonathan M19/09/2020 08:43:42
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That's going to be a very nice shed indeed!

Martin McIntosh19/09/2020 09:09:27
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Same size as mine. The space soon fills up. I am now using a diesel heater plus a small oil filled electric one on frost setting only.

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