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RE: Bvm Bob Cat Build thread!
ORIGINAL: JustABigKid Lasse, did you weigh your finished Bobcat? But I do not remember, I will be back with the weight tomorrow. |
RE: Bvm Bob Cat Build thread!
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ORIGINAL: JetCatJimmy Excellent maiden!! And great work on the knife edge. I'm still trying to dial mine in. Did you program that in a mix, or is it all thumb work? I train my thumbs on Shulman knife edges[8D] Regards Lasse Palm |
RE: Bvm Bob Cat Build thread!
HA HA~! Yes, I need to just figure it out. I currently have no mixes loaded anyway and would love to keep it that way.
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RE: Bvm Bob Cat Build thread!
ORIGINAL: JustABigKid Lasse, did you weigh your finished Bobcat? Lasse P |
RE: Bvm Bob Cat Build thread!
Thanks! [8D] ORIGINAL: Lasse Palm ORIGINAL: JustABigKid Lasse, did you weigh your finished Bobcat? Lasse P |
RE: Bvm Bob Cat Build thread!
Grattis Lasse! till en i mitt tycke en lite tuff men bra premiärflygning
Christer Pekkala |
RE: Bvm Bob Cat Build thread!
ORIGINAL: Pekkala Grattis Lasse! till en i mitt tycke en lite tuff men bra premiärflygning Christer Pekkala modellen flyger som en dröm så jag kunde inte låta bli att känna lite på den he,he:D Hälsningar Lasse P |
RE: Bvm Bob Cat Build thread!
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Hi,
I am nearly finished with mine. Hopefully the maiden flight tomorrow. My BC has the new JetCAT P-80 SE kerostart installed. (with 97N - a bit over 22lbs of thrust) I am struggling with the flap throw and flap mixer settings, though. I do not understand the recommendations of the BVM website on this. Can one of you experts tell me how much flaps you use and how much elevator downtrim you mix in ? Do you also mix in the aileron trim (crow braking ?) ? Do you use the flaps on take-off ? Best Regards, Nicolas. |
RE: Bvm Bob Cat Build thread!
ORIGINAL: SpiderJets Hi, I am nearly finished with mine. Hopefully the maiden flight tomorrow. My BC has the new JetCAT P-80 SE kerostart installed. (with 97N - a bit over 22lbs of thrust) I am struggling with the flap throw and flap mixer settings, though. I do not understand the recommendations of the BVM website on this. Can one of you experts tell me how much flaps you use and how much elevator downtrim you mix in ? Do you also mix in the aileron trim (crow braking ?) ? Do you use the flaps on take-off ? Best Regards, Nicolas. I am not a BC expert yet!;) But I reply anyway!!:D I don`t use flaps on my first maiden take-off. But If I will fly on grass fields, I will possibly use take-off flaps. I used Bvms Recommended full flaps for landing but without mixed elevator,I think i will try some different flaps/elevator mixes, because I have move the recommended center of gravity (20 mm behind the drilled holes) Good luck with the maiden.[sm=thumbup.gif] Regards Lasse P |
RE: Bvm Bob Cat Build thread!
Lasse, can you comment on how visible the Blue/Yellow color scheme is on your Bobcat? Any problems seeing it against the sky?
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RE: Bvm Bob Cat Build thread!
Lasse,
I test flew my Bobcat last last week with a P70, i was cautious with my CG setting. Where is yours set and how do you did you find it to fly? and where did you put you ECU and receiver battery(s)? |
RE: Bvm Bob Cat Build thread!
I'm am just a few days from my maiden flight and wanted to know if you would comment on the control throws of aileron, elevator, rudder? My setup is as follows:
elevator: 2" up / 1.5" down aileron: 1" up / 3/4" down rudder: 1" in - 1.5" outboard I don't have the original manual since I purchased mycomposite BCused, but found the above numbers on the BVM website. I have added about 15-20% expo to each of the above just because that is how I set upmost of my aircraft. My first flights will be from a grass runway. How do you feel about using 1/2 flaps for takeoff? I have found on this forum that some required up trim when using flaps, while others have required down trim. I find that odd. Any comments? Did you use full flaps on your first landing? What about flight times? Iran my RAM 500equipped BC with full tanks and got about 6 1/2 minutes (at full throttle) before pulling from the UAT. I thought about setting my maiden flight at 5 minutes to be on the safe side. Center of gravity: is that measured with landing gear up or down? John |
RE: Bvm Bob Cat Build thread!
Edited - Sorry, I was being repetitive. 1/2 flaps for takeoff are fine for me, but a little up elevator was required for 1/2 flaps slightly more with full flaps and gear down. On my P-80, it uses 8oz/minute and I have a UAT, center hopper tank, and 2 saddle tanks. This gives me between 6-8 minutes depending on how I use the throttle. This also allows for a few fly-by's incase I don't like the approach. Hope this helps!</p> |
RE: Bvm Bob Cat Build thread!
ORIGINAL: JetCatJimmy Edited - Sorry, I was being repetitive. 1/2 flaps for takeoff are fine for me, but a little up elevator was required for 1/2 flaps slightly more with full flaps and gear down. On my P-80, it uses 8oz/minute and I have a UAT, center hopper tank, and 2 saddle tanks. This gives me between 6-8 minutes depending on how I use the throttle. This also allows for a few fly-by's incase I don't like the approach. Hope this helps!</p> |
RE: Bvm Bob Cat Build thread!
1" of aileron throw is a lot for my taste, I run less and more expo. BVMs aileron rates have always seemed high to me but the elevators are always spot on.
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RE: Bvm Bob Cat Build thread!
I was very pleased with the setup initially. I added a little more down elevator throw in order to improve inverted flying, and have increased the rudder throws so I can practice my knifeedge. But it still balances on the holes in the booms and everything else is stock. By the way, I edited my previous post as I re-read yours.</p> |
RE: Bvm Bob Cat Build thread!
ORIGINAL: JetCatJimmy I was very pleased with the setup initially. I added a little more down elevator throw in order to improve inverted flying, and have increased the rudder throws so I can practice my knifeedge. But it still balances on the holes in the booms and everything else is stock. By the way, I edited my previous post as I re-read yours.</p> Jimmy, Are you checking balance with gear up or down? |
RE: Bvm Bob Cat Build thread!
I check the CG with gear down and the UAT full of kero, but all other tanks EMPTY. I'm using A123's all through the plane. 3-cell ECU in the nose and 2 2-cell Rx packs velcroed to the side of the fuse in the rear of the plane. Much room for adjustments of CG when I have more time to mess around with it.
I'm going to be painting soon and want to compensate for the tailweight the new colors will end up adding. |
RE: Bvm Bob Cat Build thread!
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Jimmy,
Thanks for the tips. I did my maiden last weekend without incident. Used the recommended throws issued by BVM but found the elevator a bit touchy at high speed. Switched to low rate (about 20% less throw) and have left it there for all flight modes. I used 1/2 flaps on takeoff and full for landing. About 3/8" uptrimprogrammed for half flapsand1/2" forfull flaps. My CG is per the instructions (on the fuselage holes) but plan to move it back soon. My field is grass and a bit rough in spots. Made 5 successful flights on Saturday but broke two flex plates the following day. Need to work on my landings! I'm using the stock BVM retracts and Duro struts. Have a set of Pro Links on order to replace the mains and hope that will help. I'm considering a engine upgrade since the RAM 500 takes longer to get to altitude (at take off) than I like. I'm considering the P70 or 80, but a bit confused at the $300 price difference in the two and would expect the larger turbine to cost more. Any comments? John ORIGINAL: JetCatJimmy I check the CG with gear down and the UAT full of kero, but all other tanks EMPTY. I'm using A123's all through the plane. 3-cell ECU in the nose and 2 2-cell Rx packs velcroed to the side of the fuse in the rear of the plane. Much room for adjustments of CG when I have more time to mess around with it. I'm going to be painting soon and want to compensate for the tailweight the new colors will end up adding. |
RE: Bvm Bob Cat Build thread!
Congratulations!!! Yes, I also broke a couple flex plates on the first couple flights. I really needed to learn to let the plane settle onto the mains. I had a tendency to fly it onto the nose wheel. Now, I just let her glide in at pretty much idle once I'm about 30 feet from the end of the runway. She settles beautifully.
I ended up adding a lot of expo to the surfaces, but kept the elevator throws so that I could do some more aerobatics, but I know what you mean about the touchiness. In the beginning, someone asked if my aileron servos were twitchy because the plane was rocking back and forth at speed. I kinda laughed and told him, no - my hands had been shaking the whole time!! I don't know the reason for the cheaper price on the P80-SE, but I have my older P80 dialed up to the max which is about 21 pounds of thrust. The new SE seems to have that and a machined compressor wheel for faster response. I would definitely get the most engine for your dollar there! I'm almost at a 1:1 thrust with my jet and I really enjoy its performance! Once again, great job on the maiden, and your color scheme is awesome. Very bright! Mine gets its paint this week. Wish me luck! ORIGINAL: jthomas235 Jimmy, Thanks for the tips. I did my maiden last weekend without incident. Used the recommended throws issued by BVM but found the elevator a bit touchy at high speed. Switched to low rate (about 20% less throw) and have left it there for all flight modes. I used 1/2 flaps on takeoff and full for landing. About 1/8" down trim added for half and a little more for full flaps. My CG is per the instructions (on the fuselage holes) but plan to move it back soon. My field is grass and a bit rough in spots. Made 5 successful flights on Saturday but broke two flex plates the following day. Need to work on my landings! I'm using the stock BVM retracts and Duro struts. Have a set of Pro Links on order to replace the mains and hope that will help. I'm considering a engine upgrade since the RAM 500 takes longer to get to altitude (at take off) than I care for. I'm considering the P70 or 80, but a bit confused at the $300 price difference in the two and would expect the larger turbine to cost more. Any comments? John ORIGINAL: JetCatJimmy I check the CG with gear down and the UAT full of kero, but all other tanks EMPTY. I'm using A123's all through the plane. 3-cell ECU in the nose and 2 2-cell Rx packs velcroed to the side of the fuse in the rear of the plane. Much room for adjustments of CG when I have more time to mess around with it. I'm going to be painting soon and want to compensate for the tailweight the new colors will end up adding. |
RE: Bvm Bob Cat Build thread!
HI TO ALL ,
I JUST FINISHED UP READING THIS ALL THRED REGARDING THE BOB CAT , INCLUDING WATCHING THE VIDIO , GREAT MAIDEN, MUSIC AND PRESANTATION.MY BOBCAT IS MY FIRST JET TRAINER . I HAVE ABOUT 100 FLIGHT , WITH A P-80. TOP SPEED +- 115 MPH .FLY OF PAVED RUNWAY , BROKE 3 TIMES NOSE FLEX PLATE , AND 5 TIMES ALTERNATE MAIN FLEX PLATS. 2 - FLAME OUT , 1 ECU BATT. FAILER , 1 TURBINE FLAME OUT. AFTER SENT FOR SERVICE - FLOWLESS . JR 10X SPECTRUM CONVERTION , SPECTRUM 9100 RX 4 SATELIGHT RX . BULLET PROOF . TO THE NEW COMERES EACH LANDING IS DIFFERENT. IT IS ALL PRACTICE , PRACTICE AND MORE PRC....... THE FLEX PLAT WITH THE TRAILING LINKS ARE GREAT , AND REALY SAVE THE PLANE FROM BRAKAGE . AND TRAST ME I HAD SOME ROUGH LANDING , BUNNY HUMPING , JUMPING AND EVEN LANDING UP SIDE DOWN .THE BOB CAT IS SOLID LIKE A ROCK . MY FLIGHT DURATION IS 7 MIN . SET UP FOR LANDING AFTER 5 MIN . THE OLD P - 80 ARE GAS HUNGRY . I WILL RECOMEND THE NEW P - 80 SE , SLIGHTLY MORE TRUST AND FAST RESPOND . I LAND WITH FULL FLAPS , UP TRIM ON ELEV , UP AIL ( CROW ) . IF YOU NEED MORE INFO ( I AM NOT EXPERT , JUST MY EXPIRIENCE WITH MY BOBCAT ) DROP ME A LINE. HAVE FUN WITH YOUR NEW BOBCAT ONE OF THE BEST SPORT JET THAT CAN TAKE P -70 TO P -160 !!! NOT KIDDING. ISAAC BTW WHERE IS THE SPELL CK IN THIS FORM ? |
RE: Bvm Bob Cat Build thread!
ORIGINAL: Lasse Palm Cockpit and Canopy I make my own Cockpit/Clear canopy!! Lasse I really like the detailed Cockpit on your Bobcat. Can you tell me where I can get the plastic instrument panels from ??? Thanks Paul |
RE: Bvm Bob Cat Build thread!
Hello Paul!
I used the cockpit interior from Nauwa models in Sweden, they made these cockpit accessories! But!! The company does not exist anymore..Sorry![&o] Regards Lasse Palm |
RE: Bvm Bob Cat Build thread!
Why did I just now see this? I even searched a while back. Mine is about halfway done, looking forward to reading this thread.
Mine will be all Futaba Sbus with a P100, should be pretty minimal wiring:D |
What servos are you guys using for the rudders, JR3301 not that common here
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