RC Groups

RC Groups
    Giant Electric Planes
        Build Log 2.4 Meter Horten VII

#1 cpdude Jan 09, 2012 12:05 AM

2.4 Meter Horten VII
 
9 Attachment(s)
Well I couldn't resist any longer now that my Horten IIIe has flown I've decided to start the actual--glue it together--build. This is going to be an alpha/prototype build since I'm using it to flush out the design and prove (hopefully) that it'll fly. I've already made a bunch of changes to the drawing and I'll probably make many more.

Anyway, I've glued a few pieces together. Please no comments on the big part in the center. I know it looks like it was carved from a 2 x 4. :D If you look at the comments on the drawings you'll see that this part has been redesigned. The changes just didn't make it into this build.

I'll try to post some of the specs (e.g. motors, batteries, wing area...etc) tomorrow when I'm awake.

Please let me know if you have any questions.

Enjoy!
Brian

#2 nmasters Jan 09, 2012 09:40 AM

Subscribed:popcorn:

#3 cpdude Jan 09, 2012 10:39 AM

Some specs
 
Here are some specs for the Ho VII...

Motors: Exceed RC Rocket 3520-1050KV (http://www.hobbypartz.com/86mc302-3520-1050kv.html)

Landing gear:
Mains - 25 - 46 100 Degree Rotating Electric Retracts (http://www.e-fliterc.com/Products/De...ProdID=EFLG320)
Nose gear taken from - 25 - 46 Tricycle Electric Retracts (http://www.e-fliterc.com/Products/De...ProdID=EFLG330)

Batteries:
two 4S ??mAh LiPo batteries. Whatever it takes to balance.

Joiner tubes:
two 7/8" x 36" (.049") from Tnt Landing gear (http://www.tntlandinggear.com/store/shop/wing_tubes.htm)

The wing area is ~10.8 sq. ft. At this point I'm thinking the prototype could come out in the 12lb range. That puts the wing loading in the 18oz/sq. ft. range.

The motors are rated for 1,300 watts. However, I'm only planing to put ~800 watts so that puts the power at ~133 watts/pound. If I need more power I can always add more prop or go to 5S ;) If I feel like spending lots of money I can always switch to Hacker A40-10L V2s and run 8S batteries. Either way I can definitly increase power if necessary.

Thoughts?

Brian

#4 birdofplay Jan 09, 2012 11:11 AM

Sure, now the pressure is on me for the molds. :-)

Subscribed

Bob

#5 cpdude Jan 09, 2012 11:28 AM

Quote:

Originally Posted by birdofplay (Post 20368613)
Sure, now the pressure is on me for the molds. :-)

Subscribed

Bob

Hey Bob,

I'm sure she'll fly just fine without the canopy and motor intakes. Do you want me to send you a current picture showing the real build status? Then you'll be under some real pressure. ;)

Brian

#6 invertmast Jan 09, 2012 11:42 AM

What about doing a thin fiberglass shell for the center section? Kind of like wings over the web horten wing? Would be a bit more expensive, but save some weight and building time

#7 birdofplay Jan 09, 2012 12:01 PM

Send pix :-)

#8 cpdude Jan 09, 2012 12:10 PM

Quote:

Originally Posted by birdofplay (Post 20369119)
Send pix :-)

I got pulled into a meeting. :( Soon...

#9 cpdude Jan 09, 2012 12:16 PM

Quote:

Originally Posted by invertmast (Post 20368915)
What about doing a thin fiberglass shell for the center section? Kind of like wings over the web horten wing? Would be a bit more expensive, but save some weight and building time

Great idea! But I doubt that I'll have the time to do that anytime soon. If someone (you?) would like to step up and make and share a fiberglass shell then I will gladly provide all of the center section ribs and bulkheads for free. Remember this is an open source project. :)

Brian

#10 invertmast Jan 09, 2012 12:46 PM

Quote:

Originally Posted by cpdude (Post 20369262)
Great idea! But I doubt that I'll have the time tomdo that anytime soon. If someone (you?) would like to step up and make and share a fiberglass shell then I will gladly provide all of the center section ribs and bulkheads for free. Remember this is an open source project. :)

Brian

I could do that. If no one is in a huge rush i can wait till youhet the design finalized and then work from there. It will probably be better off to wait till the outer wing panels are done as well so the joint line will be the same

#11 cpdude Jan 09, 2012 12:52 PM

I'm definitely not in a rush. We should definitely talk when the time is right.

Brian

#12 cpdude Jan 09, 2012 12:54 PM

Link to the design/discussion thread
 
I forgot to post this earlier. At some point the two threads will get separated so here is the link to the design/discussion thread: http://www.rcgroups.com/forums/showthread.php?t=1546211

Enjoy!
Brian

#13 birdofplay Jan 09, 2012 08:22 PM

Beautiful Pix !
You do great work.

#14 fritzdecat Jan 09, 2012 08:28 PM

excellent subd

#15 cpdude Jan 09, 2012 08:41 PM

Some more pics
 
6 Attachment(s)
I've got a few more pictures I thought I'd post. I'll keep the description fairly brief. Please ask if you have any questions.

Brian


All times are GMT -5. The time now is 01:30 AM.