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Thats pretty cool but I would rather have the fuse scaled up to have proportinate engine nacells.
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Glad you agree, kind of felt bad about down talking someone elses project.
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Nah, it is what it is. Cheap foamy. Overall not bad job, semi-scale but yeah those oversized nacells drive me nuts.
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Meh, I like big engines, makes it look tough. I am pretty sure they did this to make it fly better, You can imagine the backflip phenomenon with a scale length and size foreward fuselage???
The whole aircraft resembles a balance between everything, but in the air it doe look really good no one can deny that. |
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For all these reasons I reckon you are far better off with the "adjusted scale" foamy you have as it's a minimal hassle to build and still looks pretty good. If you want genuine scale then you'll need to go to a huge airframe with a high-end power system so match. As hand-launchable SR71 foamies go I reckon you've probably got it right. Si |
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Yeah I definitely understand why the nacelles are over sized. A much larger airframe would be problematic to hand toss since I fly at a bumpy/mucky/grass field. Overall, it looks really good and quite impressive in the air that is for sure (especially on those low WOT 100+mph passes)!
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i have been flying on eof these stock, getting a feel of it to build a LARGE one. 11' long off plans.
the biggest problem i found that is true with most foamies, it is so light that there is no momentum on landing. the foam slows down quickly and an stiff breez can make it interesting. almost like trying to land a feather in the wind. But as long as it is flown in a scale like manner it is fine. and if you linger to long and your escs cut off power to the engines ... your down quik. |
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I have found that I really have to fly her down to the ground with about 1/4 throttle or she will nose up. Wing rock is another symptom of the SR-71. It feels so weird not to flare on landing so I have to fight against my instinct and keep a touch of down elevator all the way to the ground. I reinforced the bottoms of my nacelles to handle the shock...I think I am going to add little skids as well.
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Ran a pack through her this evening. Unfortunately the grey sky/clouds made orientation especially difficult and boy it didn't take but a split second and I lost orientation. Was it coming towards me? Away from me? What was it doing? I couldn't gain it back fast enough and the ground was rising to meet her so dang fast so I dropped the throttle and she went over the embankment.
Luckily she landed dirty side down but on a road so she split in a few different places. All the splits were extremely clean and a few minutes with CA and she will be ready to go again. Whew! |
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First you take the diameter of the inside of your fan to get the area then deduct the area of the motor housing to give you fan swept area. Reduce the area of that by 20% for an 80% exit area for your tail pipe. Now you take the front diameter and plug it into one end of the program, ad the total length of the pipe and ad the exit diameter and hit print, take the print and ad 1/4" to the lap edge and 1/4" to the lap to the fan for tape. Overlay some acetate or mylar and cut it out for your custom made cone, roll it up to the overlap and tape into place on the back end of the fan housing, re install the fan set and go fly!
Tom |
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Thanks Apex. Looks like I will have to try that on a new airframe. Her expiration date came today.
Every hand launch has been a real adventure. For whatever reason, no matter how smoothly and perfect pitch and level it left my hands, it would bank heavily to the right almost smashing to the ground every single time. But once I counter-corrected and got her some more altitude, she would fly beautifully. So it wasn't a trim issue, nor a CG issue. Today, she banked again to the right but this time my counter inputs did nothing. She slammed into terra firma with a sickening thud with black bits of foam spraying everywhere. I glued her all back together like Frankenstein at the field and tried again (I'm nothing if not determined). Same thing but worse. This time the airframe simply wasn't worth saving. So I yanked all the components out and will pick up a new airframe in a few weeks. If anyone has ideas what could cause such extreme banking regardless of my hand toss ability I would love to have some insight. I did carve out two finger tip sized holes close to the CG for easier hand tossing but I wonder if it was actually contributing to the problem. I'll need to find out so I don't have these issues with my next airframe. |
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Sorry to hear about the loss Aros. I have been watching this thread and have been encouraged from your reports of a nice flying SR. I don't have any ideas on hand launching to offer. I personally can't stand to hand launch because for me, every one is a near disaster. I do so much better with a rolling takeoff. I am looking forward to seeing you get this bird flight ready again.
Paul |
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