Mudball3

Hi, as stated above i orded a MoJo 60 taday. I have been reading through the forums today and have gotten a lot of good info on what gear to run. I was just wondering if anyone out there has ran Airtronics Digital Hi-Power BB MG [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXYZW9&P=0]Servo[/link] in these planes. It seems to have good power and doesnt weigh to much considering the torque that it is putting out. I am either gonna run a Lipo with reg or a 2/3A receiver pack, havent decided yet. Any thoughts.

Thanks

ThumbSkull

My Feedback: (57)

An excellent choice.

A123 unregulated. Best choice if you have to buy something for it.

You want 140+ oz. on the rudder. The others are OK at 120+ oz.
2.1 oz. servos are OK. This plane really 3D's a little better at 6-6.5 lbs.
I really like servos in the .14/60* or faster range.
HS-85MG is hard to beat for the throttle.

The perfect setup IMO is at about 6lbs dry with a Saito 100.
Other good choices are Saito 115, Saito 125, YS110-115, even a 120AX.
Neutral CG at 7 1/4" - 7 3/8".

When you set one up, put everything on, covering, linkage, servos, RX, battery, tank, tailwheel or skid, then set the CG by placing the engine (prop and nuts included) on with rubber bands.
When the CG is to the plan, drill for the engine bolts.

Mudball3

I should probably mention that I had planed on running a ST 90S engine with a jett muffler since i already have that. The other engine that I have is a YS 140 but that would just be to much.

ThumbSkull:

What servo would you rec. Im not to limmited on cash.

thanks

ThumbSkull

My Feedback: (57)

I have HS965MG's in my current MoJo but I'm favoring the Savox line for future builds. They have the smoothest gearsets I've seen.

I have some of the 125oz [link=http://www.savoxusa.com/Savox_SC1251MG_Digital_Servo_p/savsc1251mg.htm]Savox 1251MG's[/link] for my future 40 size profiles.
And these 166oz [link=http://www.savoxusa.com/Savox_SC1258TG_Digital_Servo_p/savsc1258tg.htm]Savox 1258TG's[/link] for my Primo 60.
The Savox servos use a 25T Futaba spline so servo horns are easy to get in the right size.

The ST90 is not a great 3D engine but might work OK. Saito 100 and a 15x6 is much preferred for the MoJo 60.
The 140YS is a great engine for the MoJo65. Keep it.

Mudball3

Thanks for the info, Im gonna give those Savox a try. When i bought the Mojo 60 kit I might have been a little nieve. I figured since it was a profile it would be cheap, I was wrong. Im not going to cut corners on the gear though. I going to try that ST S90 engine with the Jett muffler and try to prop it between 11 and 12 thousand RPM. If it doesnt do well I may try something else. I should have mentioned earlier that this is going to be my first venture into 3D flying. I have wanted to do it for a long time but I just couldnt see shelling out the cash for the 50cc and larger scale planes. I just need to figure out how I am going to cover it. Do you know were I can get large orange Futaba stickers for the top of the wings? Any more tips would be appreciated.

thanks

ThumbSkull

My Feedback: (57)

I can highly recommend these control rods.
[link=http://outlawhobbyproducts.com/product.php?productid=241&cat=115&page=1]http://outlawhobbyproducts.com/product.php?productid=241&cat=115&page=1[/link]

This tank attachment kit is great.
[link=http://outlawhobbyproducts.com/profile_plane-anti-foam-fuel-tank-kit.html]http://outlawhobbyproducts.com/profile_plane-anti-foam-fuel-tank-kit.html[/link]

Maylon

Thumb,
Curious where you got your CGfiguers from. Have you actually used them or seen them used?
The reason I'm asking is the plans show the CG at 5 5/16. I realize that is just a starting point, but 2 inches is a big difference.
Not questioning your abilities, just asking. Thanks.

ThumbSkull

My Feedback: (57)

That measurement is from the leading edge at the root of the wing of my neutral flying MoJo60.
Here is what the designer says for a starting point.

http://www.swanyshouse.com/forums/ya...f-gravity.aspx

KWJ48

The mojo 60 is so stable it will still will fly ok even tail heavy. Thumbskull is correct though with the cg. I couldn't tell you where I have mine at but I think I started around 6 1/2 and adjusted back to where it is hands off inverted.

Maylon

Thumb,
Thanks for the link. I knew I had seen it and went over there before posting the question but couldn't find it. Just wasn't looking in the right place.
That info sure makes me feel good. I put a couple of extra braces and pieces of tri stock in the tail and rudder and ended up a little tail heavy.
So I had to add aheavy spinner nut and some lead (won't say how much)to get it to balance at the 55/16 point. So now maybe I can take some
of it out, since I canmove the balance point back father than what I have it at now.
Again, thanks for the help. Hopefully I'll get to maiden it in the next week or so.

ThumbSkull

My Feedback: (57)

I'd pull the extra weights and do the maiden flight at 7" or so. It's a slightly safer starting point.

juanjulian

My Feedback: (9)

Had a Super Tigre .75 and was marginal.

It changed with a Saito 100 MORE THAN ENOUGH PORWER it hovers at 15% tht stick.

The elevator servos need to be very strong to handle the elevator en rudder. 120 oz wer not enough in my case.

cheers,

juan

mrbigg

My Feedback: (21)

Your ST .90 will be plenty. I'm even using 0% Nitro fuel. I've been flying mine now for the past 3 mornings. Just maidened it Sunday morning. Had a MA K series 14x4 prop on it for the first couple of flights. It would rip the snot out of it, but I could tell it wasn't efficient. Put on an APC 15x4W and what a difference. I have an APC 14x4 that I might throw on to see if it's any better, but I'm pretty happy with the 15. I'm going to finish up the trim on the wings and stab this afternoon. I'll post pics when done.
(By the way, mine came in at 6 pounds, 10oz dry with the stock muffler. A123 2300 battery pack. Plane is a floater.)

Sotos

My Feedback: (12)

Mudball,

Whether or not the ST 90 works for this application isn't so much how much power it has (it has plenty) it's more a question of how well you can tune it to transition through the midrange, where you will be spending lots of time. Much has been written about the ST carbs and their shortcomings, so I won't go into that here, but if you're new to 3d, what you really need is an engine that transitions well throughout its midrange. Mr. Bigg, if you have a ST 90 that transitions well, you're a lucky one indeed. I'm sure there are some ST's out there that tune well for midrange, but that hasn't been my experience. Mudball, good luck and let us know how it works out for you.

HTH

mrbigg

My Feedback: (21)

No, problems there.

mrbigg

My Feedback: (21)

How do you like the Jett muffler? Big increase in power? What about the noise?

Mudball3

Sotos,

The reason I am considering the ST is that It is the engine that I have. I also have a OS 7M and 7D carb laying around not doing any thing. I will be using one of these two carbs on my ST to get the midrange to run and transition properly.

mrbigg,

I actually have not run the combo yet but will post back some re****s once I do. I am hoping to run a 15 or 16x4 prop around 10 to 11 thousand RPM. I post what I find out on this setup.

Anyone,

I am currently building the Mojo 60 with the removable wing. The two small rectangular blocks with the three holes in them that are for the landing gear do the get glued into the fuse before it is laminated on both sided with the plywood? Or does that rectangular hole on the fuse stay hollow when it is laminated with the ply? Thanks much.

KWJ48

The blocks with the three holes are for the" L " part of the gear at the top end. There's a "H" shaped block for the opening on the bottom of the motor mount. Only the H one gets glued, just run bolts through the 3 holes.

Oops I forgot about the new mount. Yes glue all together, except the routed L blocks. Make sure all holes line up.

Look at the primo 60 build manual on swany's site if needed.

mrbigg

My Feedback: (21)

Here's them pics Mud.

Mudball3

That is one nice looking cover job. Were did you get the checkered covering. I have looked on Tower Hobbies and havent seen that kind of covering, just solid colors. Thanks

mrbigg

My Feedback: (21)

It's Ultracote. Check out Horizon Hobbies.

Sotos

My Feedback: (12)

Mudball3,

Perfect fix for the ST carb (replace it), sounds like you're way ahead of me. Best of luck with your build.

OldRookie

My Feedback: (13)

What is the deal with the weight of this plane?
The specifications for this plane say 5-5.5 lbs. Mine came out at 6lbs 4oz, and other than leaving off landing gear, tail wheel, servos, and not covering it at all, I don't see where I could remove one pound from this plane.
It also calls out for 70oz servos, but 120oz to 140oz servos are recommended.
I have mine set up pretty much like ThumbSkull recommended, but why the big difference between specifications and reality for this plane?

Greg

ThumbSkull

My Feedback: (57)

Mine is built with a YS110, HS-965MG's and mostly CA with the epoxy used for the mount and tube lightened with micro-balloons.
6lbs even (dry) when built. After a few repairs I'm up about 3oz's.
There is some variability in the balsa from kit to kit. It actually flies good (and some prefer) up to 7lbs.
I wouldn't sweat it.

JUGFLIER

I have the mojo 60, don't know the weight but have the saito 100. That is the perfect engine, rockets out of a hover.