DV8R, who is flying them and what would you change?
02-24-2017, 10:09 PM
#127
These struts came out of a Fei Bao Hawk/T-45, I checked on line and it looks that they're available.
I think the wheels are Airpower, 2.75".
http://fbjets.com/index.php?Page=30
I think the wheels are Airpower, 2.75".
http://fbjets.com/index.php?Page=30
Last edited by CARS II; 02-25-2017 at 11:39 AM.
03-02-2017, 10:14 PM
#128
I'm done with all the drawings of the DV8R, the flap and aileron were the last two parts that needs to be drawn, now I will go back and make some adjustments on the drawings for better clarity of the parts.
This was the easy part, the hard part is ahead, making all the changes on this build so that it becomes an anyone can build this airplane from a short kit form, not impossible but man! I got my work cut out for me when it comes to the wing, that wing is such a mess but I will clean it up nicely that it will be a joy to build
I better hurry up with my builds as my free time will run out soon
This was the easy part, the hard part is ahead, making all the changes on this build so that it becomes an anyone can build this airplane from a short kit form, not impossible but man! I got my work cut out for me when it comes to the wing, that wing is such a mess but I will clean it up nicely that it will be a joy to build
I better hurry up with my builds as my free time will run out soon
Last edited by CARS II; 03-02-2017 at 10:19 PM.
05-20-2017, 12:21 PM
#129
I'm still working on this project, the work has slowed down but it will resume in a few months, other projects and a new job have taken most of my free time.
My plans are to have an airframe ready to fly by the end of the year, It will have a K 80 and I will keep as simple as possible.
My plans are to have an airframe ready to fly by the end of the year, It will have a K 80 and I will keep as simple as possible.
06-05-2017, 11:55 AM
#130
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Hello there DV8R fans. Does anyone know the size of the threaded rods (aka machine guns) that secure the wing tips (ailerons) with the center wing (flaps)? I seem to have lost them and need to replace them. Thank you Andrew
08-16-2017, 05:49 AM
#132
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I see you changed your mind from a 120 to an 80. Are you going to scale down the size of the plane for this or just fly it on a smaller engine?
Not sure what your overall plans are, but I like the look of this jet (as a sport jet), especially with the drogue chutes. I have a Rabbit 90 VT. I would be on your list to buy a version that is slightly smaller where the 90 is the top end motor for it. The hobby is lacking that size in the sport. Everything is either 60-70 and you can't fit a 90-100 or where the 90-100 is the low end of the power size.
Not sure what your overall plans are, but I like the look of this jet (as a sport jet), especially with the drogue chutes. I have a Rabbit 90 VT. I would be on your list to buy a version that is slightly smaller where the 90 is the top end motor for it. The hobby is lacking that size in the sport. Everything is either 60-70 and you can't fit a 90-100 or where the 90-100 is the low end of the power size.
08-16-2017, 11:02 AM
#133
I have a TJT 3000 that I can stick to the tail to check the top end trust and turbine position, the concerns of using this turbine is that it's heavy, because of that I prefer to go to the lower end trust with the K80, I have a Boomerang with the TJT that is 32#s dry, keeping it light yet with enough trust to have fun with it is my goal at the moment.
A smaller version is not a bad idea, you mention this before and since the K80 is around the 18#s trust, I will have to do some more research on size vrs trust where the top end is for the 18# trust turbine.
What were you looking for as far as wing length and dry weight?
I may start a new thread that will cover construction of the airplane when I get to that point.
A smaller version is not a bad idea, you mention this before and since the K80 is around the 18#s trust, I will have to do some more research on size vrs trust where the top end is for the 18# trust turbine.
What were you looking for as far as wing length and dry weight?
I may start a new thread that will cover construction of the airplane when I get to that point.
Last edited by CARS II; 08-16-2017 at 01:38 PM.
08-17-2017, 04:37 AM
#134
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I'm new to jets.....my Rabbit is the older version so its in the 18-19lb thrust as well. I'm thinking you would want the size to be about what the new KingTech 70 size jets are...but maybe just a hair larger so it could fly off that size engine but be slightly overpowered by the 80-90 size engines. I don't think you would have to shrink it down that much....but a little should make it easier to transport as well.
01-21-2018, 05:06 PM
#138
Well i'm glad to find this thread. i picked up one of uncle Georges TBM DV8R's ... Now that's a whole nother story in itself. i opted to sell my new skymaster f-16 and replace it with a good flying kick around plane as we have all grass runways up here in the northeast .. accept where we fly at our local airport. i was paying particular attention to the comments about bouncing. i was surprised given the length of the fuse etc. one thing that kept coming to mine was ... where is the CG? i fly a skymaster 2M viperjet and i know you have to get it low and slow and let the plane decide when to land. just hold it off . i tried to tell it how to land and i got a good bounce out of it. anyways i picked up a fuel tank my buddy had from a SM BD-5 . i want to put it in front of the 100oz. dubro tank as i want to drop a 160 in her. just so i can go straight up. here's some pics and i was wondering if anyone had a tank that far forward and how did it react. and i'd like to hear more about this bounce issue. WB_1
01-21-2018, 08:50 PM
#139
Having a fuel tank forward from the CG point is not a problem, you may experience a click or two change on the elevator after the forward tank is empty, I have a 50 oz smoke tank further forward away from the CG on my Boomerang and two clicks of elevator is the difference between full and empty.
I think your approach to landings is how is supposed to be done ( slow it down as much as possible on touchdowns ) if that fails then Crow is the answer.
I think your approach to landings is how is supposed to be done ( slow it down as much as possible on touchdowns ) if that fails then Crow is the answer.
Last edited by CARS II; 01-21-2018 at 08:55 PM.
01-21-2018, 09:02 PM
#140
I still have this re-birth project in maind, I haven't giving up yet, I'm looking at another way to get it done with foam wings, I suppose I will have to learn how to set up and cut and bag foam wings, I have done it in the past, I know of a book that talks about building with foam.
02-24-2018, 08:53 PM
#141
I have one of the first TBM DV8R, and it doesn't matter how slow a get it on landing, or how smoothly it touches down, it will bounce. People watching are amazed at how slow it will get on landing. The plane is very well built in that I have been flying it for years, and almost every landing resulted in a bounce. Some of them were very hard. I usually went home with a bent landing gear after flying. My method of landing was to cut the throttle and glide it in smoothly, and touch down as light as possible. That was easy to do. Then it would bounce. I have discovered that it I apply power just prior to touchdown it will still land smoothly. I can then apply brakes, cut the throttle, and it will not bounce. This is my current method of landing to stop the TBM DV8R from bouncing.
02-25-2018, 06:59 AM
#143
I'm not a DV8R expert but i have a new one i'm getting ready to put together. but a bounce condition sounds like three things to me. 1 too nose heavy and you can't get the nose up high enough causing the nose wheel to contact first . 2 not enought drag to keep it slow enough to land AKA to much lift . 3 nose strut to long causing the nose wheel to again contact the ground first . there's no mention of engine size . the larger the engine ,the more resisual thrust thus more flap or drag needed. i found that crow does make a big difference in landing as well. WB_1
02-25-2018, 08:09 AM
#144
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Dv8r
I also extended the mains approx. 1 inch by machining spacers. The wing had if i recall about a 6deg positive incidence when sitting level on ground. I never had the nose touch first on landing. However it seemed at least for me the only way to settle this jet down was to incorporate crow mix. After that i really enjoyed flying the dv8r.
i had tried back in the day to get troybuilt to model this only about 15 to 20% smaller.
i had tried back in the day to get troybuilt to model this only about 15 to 20% smaller.
02-25-2018, 06:58 PM
#145
My Xcalibur Plus, F-16, A-10 and F22 will land just fine, but my TBM DV8R will bounce. I think I have enough experience to know if I was landing on the nose gear first, or if I was landing it too fast. These are not the reasons for the bouncing. I take a lot of pride in not only my flying, but also in how well I can land. My 37% Edge 540 will land so smoothly that you cannot tell when it touches the ground. The bouncing is only an issue on the TBM version, so if you haven't flown the TBM, you have not experienced the problem. I am using the TBM landing gear, and I did have to replaced the main springs with stiffer ones. I am only flying the DV8R off of grass, and have not flown it from a hard surface. Perhaps that could make a difference. I found that the plane would land smoothly with power when I was doing some touch and goes. Now I can land it just fine every time with my current method. Having power applied at touchdown is just fine in case you need to go around. I am not posting because I need help in landing. I just want others to know of the issue.
05-23-2018, 03:53 PM
#146
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I got my waiver in one 8 years ago, and the bounce was a major problem. Broken nose gear blocks, and mains pushed up through the wing. Mine was kit built. The only way I could get it down without bouncing was to get it really slowwww on landing. I just picked up one for m " uncle George ", and am hoping that I will not have this issue. My original kit built one, had 3-4 CG marks on the fuse bottom...the builder obviously was experimenting with the CG position. We'll see. I'm using a set of jet a-one air up, spring down retracts with railing link. Hope they work ok. I have an idle k one hundred g for power. Should be good. My original had a ram seven fifty in it, and flew the crap out of it!
05-23-2018, 05:56 PM
#148
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I would think down incidence on the wing would work.....how much "crow" did you program in? My instructions call for full down flaps at 3.5 inches, which puts them way below 45 degrees...much like flap setting on my Elan. Do you guys think the k-100-g would be a good choice....21-22 lbs.
05-24-2018, 05:45 AM
#150
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I have had 3 DV8R's, one kit built and 2 TBM's, and put together 3 others for friends. You need the down elevator mix with crow ( even more than without) and the TBM version does fly with up elevator trim and if I remember corretly it is more than 1/8". Also, the DV8R is much easier to land on grass. It is like landing with a bit of brake on. It is an excellent flying airplane but it can be a challenge to land properly and crow definitely makes it more manageable.
