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RE: Nitro models pusher Bobcat? - 10/26/2007 11:55 PM   
marktur


 

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Status: offline 		Hey wasn't there about 115 pages to this thread before? I could have sworn that we were way over 110...


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RE: Nitro models pusher Bobcat? - 10/27/2007 12:23 AM   
opjose



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Someone had the "urge to purge".

It was indeed longer.



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RE: Nitro models pusher Bobcat? - 10/27/2007 5:51 AM   
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Status: offline 		THe little medusa on the falcon25 was screamin today. we got 1000 watts at 73 amps on the 6x4 prop and flew it today. the A123's are 2300 mah. after a five min flight the cutoff kicked in at 12 volts. Sure am glad I installed a UBEC on the aircraft...

WHen I checked the voltage it was down around 15 which is 2.5 volts per cell. that is on the backside of the A123 curve.

When I recharged it took 2296mah. so we pushed it right to the edge. Even the A123's were quite warm, and the wiring was warm too. My guess with dynamic loading we may have been pushing over 100 amps on burst.

I changed to a 5.5x4.5 and dropped it 10 amps, and the flight time went to 7 minutes, and am guessing we maybe lost 5mph, and a little static thrust, but its over powered anyway. AGain best guess was about 95 mph or so with fixed gear. amazed alot of folks today. the little medusa rocks. what a great trainer for a turbine swept wing. Oh an must use reflex to get it to slow down.

If I had to do it again, I would get a 2200 kv motor and swing a 7x5 prop trying to achieve about 28000rpm. The A123's depress a little more than lipos, but are flatter. the 6S pack at 70 amps was delivering 14 volts or 2.35 volts per cell under load. by lightning the load a bit and spinning the prop faster, we didnt really lose any top end. it still took off in 30 feet.

Just thought you electric bubbas might like this story. we got 6-7 min flights just like the turbine bubbas today. They liked it!!

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RE: Nitro models pusher Bobcat? - 10/28/2007 4:31 AM   
fw190pilot


 

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Status: offline 		Question for the turbine conversion guys. What weight did yours come out to? Mine with a JetJoe 1200 is 11 pounds. Hope to fly it tommorrow if all goes well.

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RE: Nitro models pusher Bobcat? - 10/28/2007 5:45 AM   
Xairflyer



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Status: online 		Yours seems heavy at 11lbs have you also fitted retracts ?

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RE: Nitro models pusher Bobcat? - 10/28/2007 5:55 AM   
fw190pilot


 

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Status: offline 		Sorry reweighed it 10.5 pounds no retracts but full autostart. Could have saved half pound with semi auto ECU.

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RE: Nitro models pusher Bobcat? - 10/28/2007 7:04 AM   
hapyjac2


 

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Status: offline 		Mine came in at 10.3 lbs with retracts, flaps, full auto start and brakes

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RE: Nitro models pusher Bobcat? - 10/28/2007 8:41 AM   
NM_Mark



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Status: offline 		Man, I'm so ticked off - went to fly fly my Bobcat today, and after 3 great flights with an OS 55, my canopy decided to do a lift and separate. The back half of the canopy was still there, acting as a speed brake - made for an exciting landing. Made it down - the plane if OK, but now I only have half a canopy. I've patched together a canopy by combining what I have left with half of a canopy from my old AV8R - looks like hell, but it will fly Sunday.

I need another, but looks like the only way I can get one is to buy another kit - and I really would rather have the Falcon 120, so I can have a home for my Ram T-500.

I'm tempted to put my Ramtec Fan on the thing with a K & B 7.5 - this combo works fairly well on my old tired (heavy) Enforcer, should work great on this plane with less weight.

Mark

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RE: Nitro models pusher Bobcat? - 10/28/2007 4:52 PM   
P 51 MAN


 

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Status: offline 		NM MARK

THEY HAVE CANOPIES, GO TO THE WEBSITE, DO A SITE SEARCH (TOP LEFTHAND CORNER) TYPE IN CANOPY THEN GO TO PAGE FIVE. $7.00 EACH. SHIPPING ???

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RE: Nitro models pusher Bobcat? - 10/28/2007 4:58 PM   
Xairflyer



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Status: online 		They seem heavy mine was only 9lb 2ozs with full auto apart from the gas can which weighs nothing, I still have the valves, regulator and a metal check valve for filling the gas. Wonder where your weight has came from. I had a 7.4v 1850mah lipo for ecu and 1400mah pack for radio.

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RE: Nitro models pusher Bobcat? - 10/28/2007 6:24 PM   
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Status: offline 		Well, got my Bobcat all back together after the safety fence mishap. Made a couple of changes while it was apart. Made the tail boom inner servo bays larger to accept standard size servos and went with a single HS-475HB on elevator and a single for rudders. Made up a carbon fiber tie rod with ball links to couple the rudders together. Much easier (and cheaper) setup than four tail servos and the weight stayed the same. Plus I prefer the durability of standard size servos over the mini's. I also added an exhaust deflector to my homemade muffler extension which points directly rearward now. My initial setup with just the muffler extension created quite a mess in flight, hopefully this will be better.

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RE: Nitro models pusher Bobcat? - 10/28/2007 6:52 PM   
thebluemax



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quote:

ORIGINAL: Stick Jammer

Well, got my Bobcat all back together after the safety fence mishap. Made a couple of changes while it was apart. Made the tail boom inner servo bays larger to accept standard size servos and went with a single HS-475HB on elevator and a single for rudders. Made up a carbon fiber tie rod with ball links to couple the rudders together. Much easier (and cheaper) setup than four tail servos and the weight stayed the same. Plus I prefer the durability of standard size servos over the mini's. I also added an exhaust deflector to my homemade muffler extension which points directly rearward now. My initial setup with just the muffler extension created quite a mess in flight, hopefully this will be better.



Do you have enough room under that rod for the rudders to start the plane safely? Looks a little tight.

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RE: Nitro models pusher Bobcat? - 10/29/2007 6:07 AM   
fw190pilot


 

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Status: offline 		Maidened mine Bobcat with JetJoe 1200 even at over 11 pounds take off weight flew very well and plenty of power. Think I need to put it on a diet and get some weight out of it could save a bunch by going to a lipo for ecu and 1 5 cell radio battery instead of 2 4 cell packs. Very happy with the plane and engine.

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RE: Nitro models pusher Bobcat? - 10/29/2007 6:16 AM   
TUMBLER


 

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Status: offline 		Been thinking about doing that same set-up with the manual start and retracts. Would love to see some video to see how fast she is on the 1200.

Thanks,

Brian

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RE: Nitro models pusher Bobcat? - 10/29/2007 6:18 AM   
Xairflyer



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Status: online 		Glad it went well, any pics

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RE: Nitro models pusher Bobcat? - 10/29/2007 6:42 AM   
fw190pilot


 

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Status: offline 		Had another club member taking in flight pics but thet didn't turn out very well. Another club member has one with a 60 pusher and mine was faster just tooling around at 2/3 throttle than his was flat out. clean it up with retracts and a little less weight this plane would be plenty fast. Wouldn't want to push this airframe too far.

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RE: Nitro models pusher Bobcat? - 10/29/2007 11:13 AM   
AGR413



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Status: offline 		Awesome mod Jammer, that it exactly the kind of mod I thought about after I put mine together but I don't think I would have done near as good a job as you did. I be looking to see how it works out for you.

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RE: Nitro models pusher Bobcat? - 10/29/2007 5:17 PM   
Stick Jammer



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Status: offline 		Original: thebluemax

quote:

Do you have enough room under that rod for the rudders to start the plane safely? Looks a little tight.


Oh yeah, plenty of room. The carbon fiber tie rod is only about 1" down from the top of the rudders, just enough to clear the elevator at full down with full rudder deflection. I think the angle of the picture makes it appear to be lower.

AGR413,
Hey thanks for the compliment but there really wasn't much to it. I was thinking about doing it that way from the start, I really don't know why I didn't. The amount of money and hassles it saves is unbelievable. $32 for two standard deluxe tail servos verses $100 for four mini's. Only two 36" extensions needed instead of four. No reversing "Y" or channel mixing needed so a six channel RX works fine. Direction of the rudder servo and steering servo are the same so they can be Y'd together if needed. Total cost of the carbon fiber tie rod setup was under $4 (13" of 5/32 carbon fiber pushrod, two 2-56 ball links, pair of small control horns). I just epoxied short lengths of 2-56 threaded rod into each end of the carbon tube instead of buying the titanium ends which are the expensive part.

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RE: Nitro models pusher Bobcat? - 10/29/2007 6:51 PM   
marktur


 

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Status: offline 		I used 81MG's for the rudders, but put them both on the same sides of the booms (one shows, so what?). This skips the needs for special wiring.
I put an HS125MG inside the stabilizer, and it works great. Using a 6v battery, it makes the servos faster and stronger, too.

You Turbine guys are pushing a LOT of weight around..it must glide like a typewriter, eh?

How fast is it coming in for landing? I think I would consider split flaps like the bigger one, AND spoilerons to slow her down on approach maybe? I'm waiting for Happy Jack to bring his out to the field...c'mon Jack - it's time!


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RE: Nitro models pusher Bobcat? - 10/29/2007 9:59 PM   
fw190pilot


 

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Status: offline 		Yes landing speed is pretty fast I had spolerions hooked up but couldn't use them had way too much throw and wanted to roll the plane. Stall is pretty abrupt but will fly right out if you have enough room.

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RE: Nitro models pusher Bobcat? - 10/30/2007 12:15 AM   
Stick Jammer



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quote:

I used 81MG's for the rudders, but put them both on the same sides of the booms (one shows, so what?). This skips the needs for special wiring.


Actually, if you go with dual rudder servos it doesn't matter which side(s) they're installed on. One inboard one outboard, both outboard, both inboard, no reversing Y is needed for any of the choices. I know it doesn't sound right and our minds want to tell us otherwise but take a close look at servo direction and which way it would throw the rudder(s) in each scenario. Dual elevator servos do require a reversing Y or a spare channel for mixing.

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RE: Nitro models pusher Bobcat? - 10/30/2007 12:58 AM   
Xairflyer



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Status: online 		To save having to fit reversing leads etc, most servos can be reversed easy enough, swap the connections on the motor (some motors have just wires other need desoldering from the pcb) and swap the two outer connections on the pot, I have done it to loads over the years.

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RE: Nitro models pusher Bobcat? - 10/30/2007 1:41 AM   
opjose



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quote:

ORIGINAL: Xairflyer

To save having to fit reversing leads etc, most servos can be reversed easy enough, swap the connections on the motor (some motors have just wires other need desoldering from the pcb) and swap the two outer connections on the pot, I have done it to loads over the years.


So all four connections need to be desoldered and redone right?

e.g. swap the two motor leads and the two on the pot used to read the gear postion?



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RE: Nitro models pusher Bobcat? - 10/30/2007 2:58 AM   
Xairflyer



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Status: online 		yes both motor and pot, pot has three connections just swap the outside ones

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RE: Nitro models pusher Bobcat? - 10/30/2007 6:15 PM   
marktur


 

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Status: offline 		Oh, too too hard...just use 1 elevator servo, and all the problems go away...



We now have tropical storm Noel brewing off the South Florida coast. It looks pretty strong - lucky there's a front coming through which will push it away, but flying for the next couple of days is just nuts - winds are 25-40 knots!

Waves are up however, so that's where I'll be. Man, I got the best 2 hobbies...cause when one gets bad, the other kicks in! (Surprised I've managed to stay married for 20 years!!!!


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