Gentlemen, (& Ladies)
I've just purchased a .25 Yak 54 from HobbyforLess. It has a wingspan of 36.8 in. With this small a plane and the .25 engine I am unsure which type of servo and receiver will serve me best. I have a Hi Tec Lazer 4 FM radio, ch. 40. Any input and insights from you "old salts" will be very appreciated. Thanks!!
Goose

http://www.hobby4less.com/index.php?...roducts_id=440
This would be a good RX:
http://www3.towerhobbies.com/cgi-bin...?&I=LXCXM8&P=7 plus an appropriate crystal.

Servos? Probably 4 standard size but what does the manual call for?

Hitec's Micro 05S is gret for small planes. Ch 1-4 and 6. .3 ounces.
http://www3.towerhobbies.com/cgi-bin...&I=LXGZT0&P=ML

Thanks guys. Haven't received the plane yet so don't have the manual. Am anticipating for shopping. Did find a slightly larger Yak (42"wingspan) that suggested mini servos with a minimum of 32 ozs of torque. That seems like alot, and hard to find in a mini, but I did find some Hitec HS-81s (16.6 grams.)at Tower that fit the bill though they are a bit pricey. Of course if standards will suffice it will be easy enough and economical. The whole purpose of this smaller plane is supposed to be economy. While I have your attention.... can I use a single conversion receiver with my Radio? (Hitec 75mgz FM Lazer ch 40) without real penalty? Of course it would be a modern single conv. receiver, not one of yesteryear. I know the receiver I already have with my radio and in a plane is duel conversion. Wow ! I've much to learn! I appreciate you guys!

Small planes need small servos and receivers. Weight is very important in planes. If you put standard size servos on that plane it will be a dog, assuming it flies at all.

A 75 MHz transmitter should NEVER be used with an airplane. The FCC designates 75 MHz for surface use only. Planes MUST be on 72 MHz.

Transmitters can be use with single and dual conversion receivers.

Hitec 75mgz FM Lazer ch 40? No such animal. The numbers contradict. Channel 40 is part of 72 MHz band. If you have a CH 40 crystal in a 75 MHz transmitter it is thoroughly illegal.

Good catch Bruce. I did not pick up on that. If it is Ch 40, it is 72 mhz.

I knew I was talking to the right people. That's a typo error. It is 72 mhz---72.5 to be exact.

Actually 72.59 MHz to be VERY exact.

Again Bruce, you ARE correct!

Ah! As I said, I have much to learn. Another question. I also am just completing my first kit, a .40 fun fly profile. (53 in. wingspan & 800 sq. in. wing area) (Global Raven) Is there any reason why I cannot mount the fuel tank sideways - that is perpendicular - at 90 degrees from fore/aft. IT would make the center of gravity for the tank 1 in. farther out from the fuse, and the fuel and pressure lines would have to exit on the wing tip end of the tank. Don't have room for the tank otherwise as it goes in the leading edge of the wing. It's a 6 oz tank. Can't find a 6oz that will fit although that is what the plan calls for. I could go to a 4oz that will fit. Approx. what would the run-time be on a .40 with a 4 oz tank? Again - thanks!

Hmmm? You should have the tank connections at or slightly above the carb inlet fitting, but side-to-side? Do you do rapid rolls? When you are rolling away from the side with the stopper you'll likely be starving the klunk. I don't know if it would be a problem in practice or not.

Hummm, you learn a lot reading these threads. I fly electric so I don't have this problem, but I can see how it would be an issue. Never thought about how a fuel tank would have to be mounted.

I agree with the receiver recommendation. I have several of them and they've worked quite well. It would also be a good idea to see what size servos the plane calls for. If the trays are cut for standards, they will do just fine. I have several .25 size planes with Futaba S3004 servos and they're definitely not dogs. If you do want to use smaller servos, you could go with minis, but due to the vibration from a glow engine, I personally would not suggest micros.

HS-81s work well in small nitro planes (.25 and smaller), but as Piper Chuck said, if the servo mounts will fit standard servos, I'd just use those.

Chuck,
There are two recommended Rxs. Which do you have and recommend? Cost is always an issue. Anyone - What is the best way to route the Rx antenna? Down the fuse? Out the wing? Let it fly in the wind? Thanks...
Warren



What goes up must come down.........IF it can solve the re-entry problem!

I normally route my antenna wire through the fuse and out the back, but my planes are hand launched and belly landed. If you are on a runway, then up to the top of the fin seems to be popular.