Mojo 40
09-28-2006, 12:49 PM
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RE: Mojo 40
True it's in the center bad I'm not sure if that matters. Most of my flat spins it looks like it spins around the engine as a center point so the tank should feel similar centrifugal forces as a profile. Who knows.
Mike
Mike
09-28-2006, 10:37 PM
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RE: Mojo 40
A couple of things to look at! Is your clunk in your tank getting hung up inside the tank? Make sure the kine is allowing the clunk to move about freely. @nd you got about 3 miles of fuel line on it. I have run 50sx, magnum .52 (2-stroke), and a 46ax all on fuels from 10% to YS20/20 and never run a pump AND never had a problem. I think you should throw that pump on something that needs it and try it. Make sure it is perfectly tuned and I bet it works great.
Dave
Dave
09-28-2006, 11:40 PM
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RE: Mojo 40
ORIGINAL: MOJO65-9or10
A couple of things to look at! Is your clunk in your tank getting hung up inside the tank? Make sure the kine is allowing the clunk to move about freely. @nd you got about 3 miles of fuel line on it. I have run 50sx, magnum .52 (2-stroke), and a 46ax all on fuels from 10% to YS20/20 and never run a pump AND never had a problem. I think you should throw that pump on something that needs it and try it. Make sure it is perfectly tuned and I bet it works great.
Dave
A couple of things to look at! Is your clunk in your tank getting hung up inside the tank? Make sure the kine is allowing the clunk to move about freely. @nd you got about 3 miles of fuel line on it. I have run 50sx, magnum .52 (2-stroke), and a 46ax all on fuels from 10% to YS20/20 and never run a pump AND never had a problem. I think you should throw that pump on something that needs it and try it. Make sure it is perfectly tuned and I bet it works great.
Dave
The engine runs superb except in flat spins which is a fuel delivery issue. Small tanks are far from ideal (do a 5s+ nose down when the tank is half or more empty). I have a 6 oz bubbles tank hanging around which I will use. This will for sure solve the problem but bubbles tanks are simply a bigger hassle to use. I must use one on my q500 (which has the same setup btw).
I don't agree on the pump. Especially the OS50 is very sensitive on the high needle setting, it runs high rpm's and high nitro contents which can easier ruin the engine if run too lean. http://www.osengines.com/engines/osmg1984.html Has a built-in Perry pump and most 3D pilots will use 30% heli fuel.
Solutions:
1. use 10 or 15% fuel without pump and with stock muffler. This is the most favorite setup at my club among the retired members.
2. use crankcase pressure and a cline regulator. best solution but $70 + s/h for a piece of plastic is ridiculous.
3. use my solution many heli pilots use and solve the current issue
4. Oh almost forgot. Run it so rich it won't lean out on vertical flight and different fuel levels.
#1 isn't an option. performance is what I like best of this hobby. Some time ago I benchmarked the difference between a stock setup with 15% fuel and my setup and the difference is significant. Over 2000 rpm gain, fast response and higher torque and the sound is phenomenal.
#2 I'm not going to do mr Cline a favor.
Well, it must be clear I go for #3 but thanks for your advice anyway :-)
Martin
09-29-2006, 05:51 PM
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RE: Mojo 40
PLANECRAZZY
i started with a webra 50 then a saito 72 and last engine a ys 63, by FARE the ys is got to be theeee best engine for the mojo 40, if your going out and buy a new engine get the ys. i ask the very same question when i built mine,but i had to try the engines i had first. by no means is it to much for a mojo,it is just rite.
ENJOY!
i started with a webra 50 then a saito 72 and last engine a ys 63, by FARE the ys is got to be theeee best engine for the mojo 40, if your going out and buy a new engine get the ys. i ask the very same question when i built mine,but i had to try the engines i had first. by no means is it to much for a mojo,it is just rite.
ENJOY!
09-29-2006, 08:37 PM
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RE: Mojo 40
Hey Guys,
I built up the top part of the wing, just before planning to do the sheeting I unpinned the ribs to see how the wing was shaping up alignment wise.
When I unpinned the ribs the tip ribs are about 1/8" off the table, I suspect the small spars may have exerted some pressure in their slots and caused this. The tip rib is up 1/8 and only the next 2 are up very slightly.
Would this cause a problem ?
Has everyone who built their wing got it to sit exactly flat after unpinning from the table ?
I built up the top part of the wing, just before planning to do the sheeting I unpinned the ribs to see how the wing was shaping up alignment wise.
When I unpinned the ribs the tip ribs are about 1/8" off the table, I suspect the small spars may have exerted some pressure in their slots and caused this. The tip rib is up 1/8 and only the next 2 are up very slightly.
Would this cause a problem ?
Has everyone who built their wing got it to sit exactly flat after unpinning from the table ?
09-29-2006, 09:06 PM
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RE: Mojo 40
it might not be quite right when you first pull it off the board.... But don't sweat it... Just get it pinned down straight and finish building it and the sheeting will hold everything where it needs to be....
09-30-2006, 12:13 PM
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RE: Mojo 40
Finished the wing this morning, I put in magnets to hold down the hatch.
Used magnets from a hard drive embedded in the hardwood rail and put some tin can strips in the hatch
Used magnets from a hard drive embedded in the hardwood rail and put some tin can strips in the hatch
09-30-2006, 10:09 PM
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RE: Mojo 40
Here's a pic of mine. Finished it after about 3 weeks of here and there building. Gonna maiden it tomorrow if we dont get rain. Power is YS63, hitec servos all around. Didn't weigh it yet but damn it's light! not used to how light profiles are. My last plane with this engine had to weigh at least two pounds more.
Mike
Mike
10-01-2006, 10:27 AM
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RE: Mojo 40
Welcome Tom
You'll love it. Don't be afraid to use some fast servos and a lot of throw. I'm using Hitec's HS-6965HB all around and my favorite throttle servo the HS-81MG on a 1650 MaH NiMH battery and JR R770 receiver. 55 degrees on the ailerons, 50 on the elevator and rudder parallel to the elevator. More and it won't spin properly on full rudder. With some expo you can fly it full rate all the time. It's a very stable plane. With the CG on 5-1/2" it will fly like a leaf.
Have fun!
Martin
You'll love it. Don't be afraid to use some fast servos and a lot of throw. I'm using Hitec's HS-6965HB all around and my favorite throttle servo the HS-81MG on a 1650 MaH NiMH battery and JR R770 receiver. 55 degrees on the ailerons, 50 on the elevator and rudder parallel to the elevator. More and it won't spin properly on full rudder. With some expo you can fly it full rate all the time. It's a very stable plane. With the CG on 5-1/2" it will fly like a leaf.
Have fun!
Martin
10-01-2006, 06:46 PM
#64
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RE: Mojo 40
ORIGINAL: mstam
Welcome Tom
You'll love it. Don't be afraid to use some fast servos and a lot of throw. I'm using Hitec's HS-6965HB all around and my favorite throttle servo the HS-81MG on a 1650 MaH NiMH battery and JR R770 receiver. 55 degrees on the ailerons, 50 on the elevator and rudder parallel to the elevator. More and it won't spin properly on full rudder. With some expo you can fly it full rate all the time. It's a very stable plane. With the CG on 5-1/2" it will fly like a leaf.
Have fun!
Martin,
It has all Hitec servos. Hs-81 on the throttle and HS5475 everywhere else. I'll have my new Futaba 7C TX tomorrow and will put the 8 channel Rx in the Edge and the 7 channel Rx in the MoJo. I want to plug the ailerons into ch 1 and ch 6.
I see your high rate settings above what are your low rate settings??
I plan to use a 13X4W or a 12.25X3.75 APC prop??? on my OS 50 SX.
It should be ready to fly by Wednesday..
Martin
Welcome Tom
You'll love it. Don't be afraid to use some fast servos and a lot of throw. I'm using Hitec's HS-6965HB all around and my favorite throttle servo the HS-81MG on a 1650 MaH NiMH battery and JR R770 receiver. 55 degrees on the ailerons, 50 on the elevator and rudder parallel to the elevator. More and it won't spin properly on full rudder. With some expo you can fly it full rate all the time. It's a very stable plane. With the CG on 5-1/2" it will fly like a leaf.
Have fun!
Martin,
It has all Hitec servos. Hs-81 on the throttle and HS5475 everywhere else. I'll have my new Futaba 7C TX tomorrow and will put the 8 channel Rx in the Edge and the 7 channel Rx in the MoJo. I want to plug the ailerons into ch 1 and ch 6.
I see your high rate settings above what are your low rate settings??
I plan to use a 13X4W or a 12.25X3.75 APC prop??? on my OS 50 SX.
It should be ready to fly by Wednesday..
Martin
10-01-2006, 08:18 PM
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RE: Mojo 40
ORIGINAL: TomTreese
ORIGINAL: mstam
Welcome Tom
You'll love it. Don't be afraid to use some fast servos and a lot of throw. I'm using Hitec's HS-6965HB all around and my favorite throttle servo the HS-81MG on a 1650 MaH NiMH battery and JR R770 receiver. 55 degrees on the ailerons, 50 on the elevator and rudder parallel to the elevator. More and it won't spin properly on full rudder. With some expo you can fly it full rate all the time. It's a very stable plane. With the CG on 5-1/2" it will fly like a leaf.
Have fun!
Martin,
It has all Hitec servos. Hs-81 on the throttle and HS5475 everywhere else. I'll have my new Futaba 7C TX tomorrow and will put the 8 channel Rx in the Edge and the 7 channel Rx in the MoJo. I want to plug the ailerons into ch 1 and ch 6.
I see your high rate settings above what are your low rate settings??
I plan to use a 13X4W or a 12.25X3.75 APC prop??? on my OS 50 SX.
It should be ready to fly by Wednesday..
ORIGINAL: mstam
Welcome Tom
You'll love it. Don't be afraid to use some fast servos and a lot of throw. I'm using Hitec's HS-6965HB all around and my favorite throttle servo the HS-81MG on a 1650 MaH NiMH battery and JR R770 receiver. 55 degrees on the ailerons, 50 on the elevator and rudder parallel to the elevator. More and it won't spin properly on full rudder. With some expo you can fly it full rate all the time. It's a very stable plane. With the CG on 5-1/2" it will fly like a leaf.
Have fun!
Martin,
It has all Hitec servos. Hs-81 on the throttle and HS5475 everywhere else. I'll have my new Futaba 7C TX tomorrow and will put the 8 channel Rx in the Edge and the 7 channel Rx in the MoJo. I want to plug the ailerons into ch 1 and ch 6.
I see your high rate settings above what are your low rate settings??
I plan to use a 13X4W or a 12.25X3.75 APC prop??? on my OS 50 SX.
It should be ready to fly by Wednesday..
aile 60%
ele 50%
rud 50%
low rates:
aile 60% of high rate 20% expo
ele 60% and 20% expo
I never use low rates for rudder
the 12.25X3.75 is absolute the best prop for the OS50. This engine has max power at 17k rpm, max torque around 15k. Let it run somewhere in between. The 13x4W won't do more than 13k rpm on 15%
Those servos are fine. Run them at 6 volts if the receiver can handle that. I can do about 7 flights on 1650 MaH with 4 digitals.
10-01-2006, 09:49 PM
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RE: Mojo 40
I ordered mine this morning, won a couple bucks at the casino last night knew what to do with it. Just wondering what motor to use on it. I have three to choose from. ST G51, Magnum 70 4stoke, or a OS 45 FSR, any opinions.
10-02-2006, 10:32 AM
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RE: Mojo 40
I used a piece of 1/32 ply with velcro and glued it next to the left aileron servo almost all the way to the back of the wing.
As far as I can recall the battery, a 5 cell AA, is mounted almost behind the servo, so to the back of the wing. The receiver is in front of the battery. I have the CG at 5-1/2". Your engine will be 2 oz lighter (muffler, pump) than mine so I guess for 5" you have the battery next to the servo.
As far as I can recall the battery, a 5 cell AA, is mounted almost behind the servo, so to the back of the wing. The receiver is in front of the battery. I have the CG at 5-1/2". Your engine will be 2 oz lighter (muffler, pump) than mine so I guess for 5" you have the battery next to the servo.
10-02-2006, 11:09 AM
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RE: Mojo 40
I just started the fuse,
how do you guys manage to hold the fuse when covering etc since it is only joined at the rudder post ?
I guess I will have to be very careful
how do you guys manage to hold the fuse when covering etc since it is only joined at the rudder post ?
I guess I will have to be very careful
10-02-2006, 11:49 AM
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RE: Mojo 40
To stabilize the fuse while covering, tack glue a little piece of scrap between the upper and lower halves in the motor mount area. Then, when you're finished just before final assembly, remove the scrap.
10-02-2006, 12:10 PM
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RE: Mojo 40
OK. I have a little 6v 720amp 5 cell and its mounted at the back of the opening between the two servos and the Rx is between the Left aileron servo and the Fuse. To be safe on the first flight I put 14 Gm on the tail. A little nose heavy is better at first. (it took 24 Gm to balance it. I'll keep adding till it's right)
Thanks. I think I'm going to go try it.
Thanks. I think I'm going to go try it.
10-02-2006, 12:14 PM
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RE: Mojo 40
You have to put the battery and receiver as far as possible to the left. With my 5-cell AA I still had to add a tiny piece of lead next to the antenna exit on the left wing tip to get the plane balanced properly.
edit:
You probably have a 5-cell AAA and you'll probably end up putting it behind the left servo as far as possible to the left.
edit:
You probably have a 5-cell AAA and you'll probably end up putting it behind the left servo as far as possible to the left.
10-02-2006, 12:37 PM
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RE: Mojo 40
I never even checked lateral balance. It does a nice straight wall and never drops a wing so maybe I got lucky and hit the lateral balance mark. I do have a heavy 1100 mah nicad pack in there for now until I order a lighter one.
Mike
Mike
10-02-2006, 05:33 PM
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RE: Mojo 40
Well Paypal says its on its way, I cant wait. I think I will use the ST 51 to start with and a 12.25 - 3.75 apc. Will standard 3004s be enough or are high torque servos needed. I have to make an order from Tower and was thinking of trying some Hitecs any sugestions for a good and cheap servo.