Ok I have a Standard BVM Bobcat for a 15lb thrust motor what JR servos should I use on surfaces, and what JRGyro should I use,The reason Im asking is I dont want to over kill it by putting 8611s everywere and I want to save some weight,Im using 5.7v regulated power thanks Paul AJUSA

Paul,

The instructions are pretty clear on what is recommended by BVM. These are the same for both the standard and xl variants. I woudl stay with 8411's on the ailerons, 3421's on the elevators, and would go up to 8417's on the rudders. If built according to the plans and rigged according to the plans you won't have any problems at all.

John Redman
Team BVM, JetCat USA
JetCat USA Janitor (Mr. Matt's old job)

Thanks John what about The Gyro? will a 410T work and turn off the tail lock...

Paul,

You would benefit more with a gyro that is capable of dual rates. You want the gain to be higher in the gear down position. I think the 410T is a single rate gyro.

If the gyro is single, just have it activate with gear down. I never fly with gyro, only with landing on Bobcat. Gyros scare the crap out of me. I have had them do some weird stuff.
And this has been beat into ground, but 9411's have been used on elevators. Although not necessary, I just liked the way they "feel" over the 3421's. A definate difference to me.
Scott

Scott,

How do you activate the gyro with gear down without the dual rates? I don't think you can remotely turn it off, I could be wrong though. I fly mine with only about 10% gyro with the gear up and I like the "feel" there as well. I have also had some gyro problems and like to have the ability to turn the gyro off or adjust the gain while flying.

First off.. BVM recommends the 3301 on the elevators, not the 3421 if I remember correctly. Whether you choose to change servos is entirely up to you. There have been literally thousands of flights on the recommended servos without issue. The real advantage a metal geared servo gives you on elevator is resistance to gear breakage from a hard landing. The elevators have some weight to them, and a hard landing can induce a shock load on a nylon gear train that can damage them. I would suggest using 9411's or 8417's on the rudder. The 8417 is overkill.. no question.. but it's MUCH better suited to handling a gyro than any other non-heli tailrotor servo. As for the gyro, I would not suggest using the 410. You cannot shut off the gain. Get yourself a JR 460 or 500 (new JR model gyro).

David,
I might be the last guy you want programming your radio, but couldnt you just set up gyro on aux 2 and give a 0% input on 1st position and 45% input in the second and a 85% input in the 3rd. Thus giving a three position gyro that could be activated independantly or could be mixed with gear.

Scott,

I don't think you can do that with the 410T you manually set the gain on the gyro. With the 460T or the 500 you could do that because you have adjust the gain through the transmitter atv. The futaba gyros work in the same way atv on the channel that the aux (gyro gain) lead is plugged into controls the gain.