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Building my own 70mm twin Jet

Old 06-24-2011, 04:50 PM
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lvjet
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Default Building my own 70mm twin Jet

After buying a Projet twin F-4 and haveing it smash threw some guys fence because of the lack of elevator it had, and buying the HET single F-18 and haveing that one blowup on me in mid air I've decided to design and build my own twin 70mm EDF. I've tried to modify the F-18 so the elevons had less slop. It still flys good but I like my planes to have a landing gear. So this project will probably take me a month or so. Ill post pics of its progression.
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Old 06-24-2011, 07:14 PM
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Originally Posted by lvjet View Post
After buying a Projet twin F-4 and haveing it smash threw some guys fence because of the lack of elevator it had, and buying the HET single F-18 and haveing that one blowup on me in mid air I've decided to design and build my own twin 70mm EDF. I've tried to modify the F-18 so the elevons had less slop. It still flys good but I like my planes to have a landing gear. So this project will probably take me a month or so. Ill post pics of its progression.
Heres a look at what i'm up to so far.
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Old 06-27-2011, 03:16 AM
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Heres some more construction pics
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Old 06-27-2011, 04:22 AM
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Hi, your jet looks nice, but i see one problem, the edf housing is together and makes for a large frontal area and a lot of drag, also the slant on the front of the motor housing is going to act like a flap, and cause frontal lift, and you might have a squirrly plane, the jet housing on a Mig 29 fulcrum might be a better way to go, Just my 2 cents worth, take care and have fun, Chellie



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Old 06-27-2011, 01:47 PM
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Hi Chellie ,
I was considering the idea of a frontal pc which will streamline the ducts. What do you think about the thought of leaveing the center section open and placeing the ESC's in there for cooling?? Thanks Chellie for your advise. Still think your the coolest Girl out there.
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Old 06-27-2011, 09:52 PM
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Originally Posted by lvjet View Post
Hi Chellie ,
I was considering the idea of a frontal pc which will streamline the ducts. What do you think about the thought of leaveing the center section open and placeing the ESC's in there for cooling?? Thanks Chellie for your advise. Still think your the coolest Girl out there.
Thank you for the complement leaving the center open will cause a lot of drag, because of the wood ribs, if you still want to use your wood frames, tappering the frontal air scoop and ducting/streamlining the air into the EDFs may help a lot, and get rid of a lot of drag, making 2 edf motor housings, like the mig 29 and with nothing between the 2 edfs may work much better, just my 2 cents worth Take care and have fun, Chellie
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Old 06-27-2011, 10:26 PM
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You certainly know alot about the hobby. Thanks for your replys. George
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Old 06-28-2011, 03:01 AM
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Originally Posted by lvjet View Post
You certainly know alot about the hobby. Thanks for your replys. George
Hi George I have been in this wonderful Hobby for over 40 years, yes i know i look 29 but i am a little older than that LOL, and I am Just Plane Crazy Take care and have fun, Chellie
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Old 06-28-2011, 04:02 AM
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good luck.. looking good
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Old 07-03-2011, 07:18 PM
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Getting a little farther along here. Drawings take the most time. Enjoy.
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Old 07-10-2011, 12:55 AM
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This is starting to get exciting. About 1/2 done. I have to build in the rudder and the upper deck. Canards, hingeing , radio work. Im figuring it will be close by the end of August. Maybe sooner. Its funtions will be , ailerons, elevator with the canard added and, rudder control.
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Old 07-10-2011, 10:35 AM
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Thats looking very very nice and strong, Keep up the great work, Chellie
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Old 07-10-2011, 05:29 PM
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Thanks alot Chellie. It has'nt been easy. Im watching out for trapping myself in a corner with this. Its easy if you continue to build without thought to what the finish product is going to turn out like. I still have to break up the upper deck solid into formers. Alot of drawing, but I love to draw so it does'nt bother me. I wish I could do something about that frontal area, but I do not want to cut up the Fusalage. With the 50 degree angle in the front it tends to pull the nose down. Interesting huh. It must have something to do with the velocity difference between the top of the duct and the bottom. With the landing gear installed it not as noticeable. Neat stuff. Love it!
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Old 07-26-2011, 02:41 PM
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Here was another major assembly finished last weekend. 62 drawings so far and, 120 CNC programs. Its been alot of work so far. It better fly!
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Old 08-03-2011, 06:13 PM
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Very nice build ,looks great . joe
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Old 08-03-2011, 06:19 PM
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waiting for the videos, very nice
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Old 08-05-2011, 02:16 AM
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More pics
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Old 08-05-2011, 03:06 AM
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Do you have your own lazer or do you have some one cutting things out for you ? I hope there will be plans for sale ,i was thinking about building a vampire but this looks very nice . joe
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Old 08-05-2011, 04:22 AM
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I cut the pcs myself with a cnc mill that I own. Any question s feel free to ask.
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Old 08-05-2011, 05:37 AM
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I have been cutting all my own parts out for 30+ years by hand . I have to where glasses for close up stuff now but not the end of the world. When i start building it i can tell the days when i lost my glasses while i was cutting parts out,kinda rough. lol You do nice work friend ! I can barely post with a computer so plans i draw or change are done by hand . It takes me a little longer but this aint a race and i am in no hurry any more. joe
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Old 08-05-2011, 07:24 PM
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Originally Posted by road king 97 View Post
I have been cutting all my own parts out for 30+ years by hand . I have to where glasses for close up stuff now but not the end of the world. When i start building it i can tell the days when i lost my glasses while i was cutting parts out,kinda rough. lol You do nice work friend ! I can barely post with a computer so plans i draw or change are done by hand . It takes me a little longer but this aint a race and i am in no hurry any more. joe
Hi Joe, Sounds like your about my age. Glasses to see with. If I had enough responces I was thinking about sending the project to a cnc lazor shop to cut the pcs out. Since I have the drawings it might be do-able. As fars as plans I would have to go to a drafting place to have them printed to scale. I think after its maiden flight I would be able to help you out. Lets see how she flys first. Im still estimating it will be ready to fly by the end of this month. Ill take a video of that. Thanks for your nice compliments. George.
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Old 08-05-2011, 09:06 PM
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Iam almost 55 my eyes started to go south at 40. Iam lucky i have built enough planes to crash cause i cant see them. I have no jets in my fleet but was getting a little nutty a month ago and thought about putting a fan in peter rakes vampire prop pusher jet. I was looking for a balsa jet that had no foam and not to much figerglassing to do to it. I normaly go for 40,s or 50.s birds and have been on a seaplane kick for a while but i have found a giant paved parking lot( about 2 blocks by 2 blocks) at a high school thats close to my house . We have a couple jet jockys at my club field but they like flying at 120 plus through the flight pattern of others so i was looking for a smaller e jet . Looking foward to the rest of your build she is looking good. joe
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Old 08-05-2011, 10:38 PM
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Originally Posted by road king 97 View Post
Iam almost 55 my eyes started to go south at 40. Iam lucky i have built enough planes to crash cause i cant see them. I have no jets in my fleet but was getting a little nutty a month ago and thought about putting a fan in peter rakes vampire prop pusher jet. I was looking for a balsa jet that had no foam and not to much figerglassing to do to it. I normaly go for 40,s or 50.s birds and have been on a seaplane kick for a while but i have found a giant paved parking lot( about 2 blocks by 2 blocks) at a high school thats close to my house . We have a couple jet jockys at my club field but they like flying at 120 plus through the flight pattern of others so i was looking for a smaller e jet . Looking foward to the rest of your build she is looking good. joe
I am 50 years old and the same story on the eyes. If all goes to plan this Jet should be docile and aerobatic. It has all flying surfaces. The wing is symetrical for a neutral effect. It should roll, fly inverted an so on. Covering I have'nt done in 10 years and its beed challenging to say the least. The upper deck was the worst . Probably should have painted it , but was afraid to add the extra weight. Im shooting for 7 to 9 Lbs max. With the wing area I have incorporated into the model, it should have a real nice glide ratio. We will see. Talk to you later. George
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Old 08-05-2011, 11:11 PM
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Hey george, i just caught this on another site ,i have used water based hardwood floor clear and cloth but this guy used deft to cover and then paint his birds with little extra weight. http://www.rcuniverse.com/forum/m_10...m.htm#10655561 joe
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Old 08-06-2011, 02:10 AM
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Originally Posted by road king 97 View Post
Hey george, i just caught this on another site ,i have used water based hardwood floor clear and cloth but this guy used deft to cover and then paint his birds with little extra weight. http://www.rcuniverse.com/forum/m_10...m.htm#10655561 joe
Hey thats nice. Im going to use that in future projects. Joe you got to see this;
http://www.flixxy.com/airplane-flies-like-a-bird.htm
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