Hey Mitja - Chill mate...Sorry Duncan, but please dont ruin your second chance to build a plane for yourself, by incorporating some of your own modifications on the structure, that could lead to (again) useless work and time..to end in a storage somwhere unfinished.
Buy plans and a "short - basic kit" if available, group by group and build per plans.
I like it too. Thanks man. I keep coming back to this one despite the tail dragger configuration and the lack of visibility at ground angle of attack. It's going to be scary for me when it's time to test it out. I hope to have a BRS by then but I'll have a back pack for sure. I'm making it out of carbon fiber golf club shafts, powering it with a mz202, and covering it with Dacron. I plan to incorporate a wing folding or detachment so I can trailer it to a dry lake bed for testing.Part Facetmobile, part Arup, I like it.
I call that room "the library." I grew up with two brothers, and that was the only place to have peace and quiet to read, especially technical stuff.Just happen to have that issue in the reading room. I cycle back issues through to re-read the Wind tunnel articles and dream.
Oh come on Duncan,Hi,
I'm at it again. This time I'm inspired both by HITC who has encouraged me to think along the lines of a Part 103 design, because in the horrendously overcrowded marketplace for light aircraft, there seem only to be two niches - STOL and Part 103
(I'm not sure I mentioned this on the forum, but I had to store my entire workshop in a container and park it on an industrial lot - together with the plugs. Unfortunately, the plugs couldn't fit inside the container, so I had to take my chances and store them on their stands next to the container. I covered them with tarpaulins and plastic sheeting, and just had to hope for the best. Then along came the biggest storm Brisbane has seen for 30 years. Huge hail smashed everything in its path - including my plugs. Water then got in, and the underlying MDF started to swell. Long story short - the plugs are past redemption.)
I still am not in a position to start building again - but at least we have secured a new place to live, which has one one but two double garages. The second of the two is going to be my workshop. We move next week. But the thought of starting all over again is heartbreaking - but the one good thing is that I have learned some very valuable lessons about how to build a plug. Next time round it will take weeks, not years.
And hence my thoughts turning once again to designs.
After having read all 44 pages of the Electric Lazair thread on the RC forums, and speaking to HITC about series hybrid electric planes, I spent most of today playing around with a possible Part 103 series hybrid concept which could be built for under $10k (including engines). It's basically a reworking of an earlier push-pull concept I was playing around with some time ago - but on a very much smaller scale. I think it's cute...
A 20hp ICE goes up front
A 15hp or so electric motor on the rear
Both run flat out for T/O and climb - which should be brisk
The ICE then does all the honours during cruise, as well as doing double-duty charging the batteries. Charging should take (I'm led to believe) about half an hour, meaning that the batteries should be fully charged for emergencies in prettyshort order. I like the idea of electric power on standby should the ICE quit.
Wing span: 28ft
Wing area 105 ft^2
Stall: 28 mph (clean) - but I'll fit Junkers flaps I think
Empty weight (including batteries): 265lbs
So I have some more work to do on the speeds and weight fronts - but I'm getting there. I still need to estimate the CG more accurately, and check all my math. But I think it is reasonably accurate as it stands. The fuse will be made of 4mm cork/glass sandwich. Wings D-Tube (2mm cork sandwich) and Depron aft of the D-Tube. Carbon (graphlite) spar.
Looking for: decent 20hp motor. I hate two-strokes. Might have to just bite that bullet though. Anyone know of a decent 20hp Rotary? Even on paper it is difficult to meet the weight limit. Building will add many pounds I fear...
Enjoy - and (as always) comments welcome. These are my first drawings - so they're a bit rough...
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