Have a Bocat XL kit on the way, does anyone have the list of servos that are reccomended? What gyro is reccomended as well?
Trying to get everything ordered.....

Thanks...
Todd

They recommend 2 8411 (ail), 2 3301 (Elevator), 2 3421 (rudder), a 4131 for steering and a couple of minis for airvalves. The gyro that TonyF suggested I get is 460T.
Nikita.

This is from memory, not from consulting the manual:

Ailerons: 2 x JR 8411
Elevators: 2 x JR 3301
Rudders: 2 x JR 3421 recommended; JR 4131's optional,
but would likely need noseweight to counterbalance.
Brakes: 1 x JR 341 or 351
Gear: 1 x JR 341 or 351
Nosegear steering: 1 x JR 4131

Gyro - was recommended as JR 450, but this is no longer available. Not sure what the latest recommendation is.

In addition to the above, you will need half a boat load of servo extensions and Y's.

Gordon

Thanks a bunch guys!!!

3301's work good in rudders too. Easy to mount and plenty of torque with dual rudders. Just an opinion!

Could someone help me also under the same heading. I am thinking about getting a Bobcat XL with a Jetcat P-120 (detuned to 17lbs.) Here's the problem, I sold one of my IMAC 33% Edges for the Bobcat and have a trunkful of JR servos and would like to know if they would work in place of the recommendations. I have four 8411's (MG), four 2721's(MG), and six 4721's<--all are standard-sized. These are all very high torque and very expensive so I would like to use them if at all possible. Thanks for your input in advance. John Lubbock TX

In addition to the servos (which I just checked and confirmed my previous post against the manual), here are the other JR parts called for:

4 x JRPA215 Heavy duty servo arms

8 x 24" servo extension leads (2 for ailerons, 4 for elevators, 2 for rudders)

2 x 12" servo extension leads (rudders)

4 x Y harness (1 aileron, 1 elevator, 1 rudder, 1 steering)

Of course, the y harnesses etc. assume that you want to Y the various extensions together. I didn't do that. Per Tony's excellent setup document (available from the BVM site), if you use separate channels for each aileron then you can set up flaperons; if you use seperate rudder vs steering then trimming the tracking on the ground independently of in the air is a breeze, etc.

I'd suggest that you read Tony's doc and assess your options before buying the extensions and Y's.

Gordon

Sir, Any one of your mentioned servos will work fine. 8411's on Ail., 2721 on Elev., 2721's on Rud. and 4131 for nose gear steering. Might want to check thickness 2721 for Elev., it is thin!
I used DS3301's for both Elev. and Rud. Keep the tail light! WHMC

John,

The 3301's required for the elevator are probably the area that is least flexible in terms of alternative servos. The stab is just so thin at that point (it's a diamond airfoil, BTW) that the other servos you listed will not fit.

For the rudders, there is enough room for a bigger servo. Only problem might be weight. BVM states that nose weight will need to be added if you use e.g. 4131's in place of the 3421's for the rudders. The 3421's are 1.04 oz; a 4131 is 1.5 oz; your 2721's (as an example) are even heavier, at 1.84oz. (I didn't check the weight of all of the servos you quoted; some may be less).

This added weight is quite far behind the CG, so you need to be careful about how much of it you take on.

Sorry - I know that's not really the news that you wanted to hear !

Gordon

My BobCat now has 3421's on the elevators. I originally built it for 3301's, then one day it fell off the table at the field, knocked the elevators and stripped the gears in the servos. The 3301's are plastic gears. I replaced them with 3421's which have metal gears. I'm sure the 3301's wouldn't break in flight, but I just feel better with the 3421's.

BTW, I installed a Matchbox on the elevators. It's really easy to set-up and has worked perfectly for about 10 flights so far.

Like Tony, I installed DS3421 servos in my elevators (when I built the airplane). 3421's are on the rudders as well, and in 25 flights so far, I've had no trioubles with any of them.
They seem to be very precise and strong.

Harley Condra
BVM REP
RAM REP
Buy American!!!!!!!!!(except for the radio)

@ tony,

please can you explain what does "matchbox" mean, what functions does it have?

does anybody know a source (in www) for details (weight, torque, speed) of the servos above mentioned?

thanx

mec

Mec,
Go here for more info on the MatchBox. The servo torque specs are also available from the Horizon hobby site.

thanx, tom

Just finalising the installation on my BobCat ready for Florida Jets.
I use a JR PCM 10 X with two channels for rudder and two for elevator. Problem is, when mixing elevator to AUX 5 the slaved elevator moves at a different speed to the main channel and the same for rudder. My manuals are still packed waiting for my new house in Australia so I can't look it up but wasn't there a twin elevator function on one of the PCM 10 series?
Any of your JR reps know how to mix to a channel AND get perfectly symmetrtical operation?

Hi David,

I think you have another problem. If you are using two channels for the rudder can you still operate a gyro on the rudders? It seems to me that you would need two gyros which would be impossible to operate identically. I set my Bobcat up using Y harnesses on all flight surfaces. This left me with an extra channel using an 8 channel radio.

Good luck,

George Rada

David:

According to what has been said in other thread, maybe your problem of assymetric speed in your elevator is because, in the JR 10 series radios, channel 9 and 10 (Aux 4 and Aux5) are updated at half the rate of the first 8 channels.

Maybe if you mix yor elevator and rudder to channels diferent than Aux 4 and Aux5 the problem will go away.

My 2 cents.

Regards

Eduardo

Thanks guys. Thats the last time I install a radio and enjoy somewine at the same time !
Completely forgot about the low update rate on channels 9 +10. Now slaving channel 8, aux 3, to elevator , result : perfection. On my F4 I have used channel 9 for gyro gain and 10 for brakes slaved to down elevator, will use the same for the BobCat. For rudder on the BobCat I will use one channel y leaded and modified by the rate gyroand slave channel 7 to rudder to drive nosewheel steering to allow fine adjustment electronically. Should work !Again, many thanks.

An here is the BobCat in Question !

Well, Hhere anyway !

And finally, I have two JR 940s receivers on 72 Mhz. Perfect and 100% reliable ands have been used to fly my F4 Can't use 72 Megs in Australia. $100 US each. Wanted : Two Duralite 4 cell packs

Does anybody know what the bag of grey powder, included in one of the fuse-related packages, is for? Is this some kind of epoxy filler? What for?
Nikita.

I believe it's fire suppressent material.

The yellow stuff is the fire suppresant powder, the grey stuff is milled fiber. You can ix the milled fiber in with regular epoxy instead of using aeropoxy.

Thanks for the clarification David