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-   -   Northstar mods - Tell me what you think (http://www.rcuniverse.com/forum/seaplanes-176/7430823-northstar-mods-tell-me-what-you-think.html)

Deadeye 04-28-2008 01:33 PM

Northstar mods - Tell me what you think
 
After having finished a Northstar for a friend this winter, I got the itch and got a kit myself. On his, I modified the engine compartment so it is 1" higher, and 1 1/2" farther forward. We did this to accomodate a Saito 65 swinging a 12X6 prop. He still has 1 pound of lead in the front. On mine, I am considering moving the entire tail assembly so it is flush with the ailerons, like the Arrow. It will also be raised to accomodate a Saito 82, swinging at least a 13" prop. Does anybody see any problems with this?

I've also considered modifting the entire tail section to resemble the Arrow. What should I do / not do?

My friends Northstar has flown, and that 65 is barely enough power for it (3300 ASL). We have also noticed a lateral 'wobble' or wing rock. Is this because it is underpowered? Is it stalling? Thanks fellas!

jeffo 04-28-2008 04:22 PM

RE: Northstar mods - Tell me what you think
 
The engine of choice in my club is the O.S 55AX.You want the most power at the least amount of weight.A lot of guys put the fuel tank on the C.G. and you can balance it close to the step.Jim Casey has a lot of mods on the Arrow thread-very helpful.-Jeffo

Lamoilleriver 04-29-2008 11:40 AM

RE: Northstar mods - Tell me what you think
 

Quote:

ORIGINAL: Deadeye

After having finished a Northstar for a friend this winter, I got the itch and got a kit myself. On his, I modified the engine compartment so it is 1" higher, and 1 1/2" farther forward. We did this to accomodate a Saito 65 swinging a 12X6 prop. He still has 1 pound of lead in the front. On mine, I am considering moving the entire tail assembly so it is flush with the ailerons, like the Arrow. It will also be raised to accomodate a Saito 82, swinging at least a 13" prop. Does anybody see any problems with this?

I've also considered modifting the entire tail section to resemble the Arrow. What should I do / not do?

My friends Northstar has flown, and that 65 is barely enough power for it (3300 ASL). We have also noticed a lateral 'wobble' or wing rock. Is this because it is underpowered? Is it stalling? Thanks fellas!

Deadeye, Thanks for asking the wing "wobble" question. Have same problem with my Northstar. Built mine according to plans and I'm using a OS .46FX with a MAS 10x7. Don't have many flights on this plane yet, flying season ended too soon last year. Anyone can answer the wing "wobble" question? Thanks in advance guys.

mscic-RCU 04-29-2008 02:27 PM

RE: Northstar mods - Tell me what you think
 
I have a .47 GMS on mine. I do not know what the wing wobble could be, unless you are approaching stall speed. If I ever would build another one, I would put a micro servo in the tank compartment for the throttle. My throttle is a little sluggish with that long cable throw. It sure is a lot of fun though! I also skinned the bottom of mine with 1/16" aircraft plywood and skipped the fiberglass bottom. It is holding up real well.

Deadeye 04-30-2008 11:19 AM

RE: Northstar mods - Tell me what you think
 
Either my friend's is built way heavy (it was 95% built when I got it, AUW is 8 pounds), or that Saito 65 is gutless. I see no way a 46ish two stroke would fly this. Maybe it is our altitude (3300 ASL)? He is going to try to attach winglets and see if the rocking goes away. I will post results.

Lamoilleriver 04-30-2008 11:47 AM

RE: Northstar mods - Tell me what you think
 
Hey Guys,

My Northstar is covered only in monocoat with some fiberglass reinforcement of the pylon area. I have no good way to measure the weight of my model, but feel it is similar in weight to my other .46 size models. I'm still experimenting(or will as season begins shortly I hope and Turkey season ends) with various props on my OS .46. Currently have fine results with a MAS 11x6 on my other .46 FX's, but the Northstar as built only allows a 10" prop. Waiting to see how your mods workout.

mscic-RCU 05-01-2008 01:16 PM

RE: Northstar mods - Tell me what you think
 
Mine falls within the weight on the plans, 6-7pounds. 8 pounds is not out of the range. With the GMS .47, it is a real speedster. It is the fastest one usually at our float fly. 8 pounds with the 4 stroke 65 might be too much. The secret to these is keeping the weight down and selecting the correct engine. I chose the GMS because it is light in weight and very strong in its class. Your friend might consider changing to a 2 stroker to lower the overall weight. With a two stroke, he might be able to shave 6 to 10 ounces of total weight from the airframe.

Lamoilleriver 05-15-2008 08:26 AM

RE: Northstar mods - Tell me what you think
 
bump

knifeedgeyak 05-19-2008 09:09 AM

RE: Northstar mods - Tell me what you think
 



Hey all,

I am right in the middle of building my first Northstar. I am at the step of shaping and adding weight to the nose cone. How much weight have you guys been using. I am running a O.S.ax .46. Any thoughts would welcomed. By the way, what a fun kit to build so far. Knock on wood.

mscic-RCU 05-19-2008 02:12 PM

RE: Northstar mods - Tell me what you think
 
most guys add 16 oz or so. mine has about 12 oz

MartyB-RCU 05-19-2008 10:16 PM

RE: Northstar mods - Tell me what you think
 
Have mine almost covered. I cut out as much as i could and fill it with lead shot and will need another oz to balance. Using a thunder tiger 46 hope to fly it this week.

knifeedgeyak 05-20-2008 10:20 AM

RE: Northstar mods - Tell me what you think
 
Covering these things seems like it is going to a be a nightmare. I wish they were in like three parts when you covered them, but what can you do. Any tips?

Lamoilleriver 05-21-2008 08:34 PM

RE: Northstar mods - Tell me what you think
 

Quote:

ORIGINAL: knifeedgeyak

Covering these things seems like it is going to a be a nightmare. I wish they were in like three parts when you covered them, but what can you do. Any tips?

Lots of coffee.:D:D:D I cut some templates from butcher paper(have a lagre roll of it for some reason) to fit the plane and then cut them oversize where necessary to make it easy to apply. Remember the template for the right wing when turned upside down is now the template for the left wing.[sm=thumbup.gif][sm=thumbup.gif][sm=thumbup.gif]
Good Luck!

Lamoilleriver 05-21-2008 08:35 PM

RE: Northstar mods - Tell me what you think
 

Quote:

ORIGINAL: MartyB-RCU

Have mine almost covered. I cut out as much as i could and fill it with lead shot and will need another oz to balance. Using a thunder tiger 46 hope to fly it this week.
Hope to read your report next week.[sm=thumbs_up.gif][sm=thumbs_up.gif][sm=thumbs_up.gif]

MartyB-RCU 05-24-2008 04:53 PM

RE: Northstar mods - Tell me what you think
 
Waiting for better weather. Here is a picture hope I can get it to post.

MartyB-RCU 05-24-2008 05:15 PM

RE: Northstar mods - Tell me what you think
 
1 Attachment(s)
Try again

knifeedgeyak 05-26-2008 10:03 AM

RE: Northstar mods - Tell me what you think
 
It looks great. How is builing the canopy? I am a little nervious about it not fitting right.

MartyB-RCU 05-27-2008 06:55 AM

RE: Northstar mods - Tell me what you think
 
Got the first flight in yesterday. This is a sweet flying plane. Give it full up right before touchdown and it lands like a butterfly. Using a 46 and could have more power. Add on to the rudder if you can cause mine would not turn in the water. Other than that I think I will like this Plane.

knifeedgeyak 06-10-2008 10:07 AM

RE: Northstar mods - Tell me what you think
 
has anyone tried covering the wing before they attached to the body? I am trying to make the covering a little easier.

Deadeye 06-13-2008 10:19 AM

RE: Northstar mods - Tell me what you think
 
My friend switched to a 60 two stroke with a mini tuned peipe. It's a real rocket now, and he is estimating a 100+ MPH top speed.

I started on my wings Monday, and am at the LG block mounting stage. I'm still really tempted to scoot the whole tail section forward ala the Arrow. I wish Laddie would pop in here and give some advice.

Strykaas 06-13-2008 02:41 PM

RE: Northstar mods - Tell me what you think
 
Quote:

My friend switched to a 60 two stroke with a mini tuned peipe.
Mhhh... I bet he installed the fuel tank at cg location... A .60 is considerably heavier than a .46-.50 engine, so not very friendly with a tail heavy configuration. Which .60 is it ?

Deadeye 06-13-2008 05:09 PM

RE: Northstar mods - Tell me what you think
 
He didn't move the fuel tank to the CG. Not sure of the make, but it is an older 60. I'm sure it's lighter than the 65 4 stroker he had on before. He's happy, anyway.

knifeedgeyak 06-20-2008 09:01 AM

RE: Northstar mods - Tell me what you think
 
Have any of you guys installed your throttle servo in the tail. I am going to and am searching for the best location. Any thoughts?

Strykaas 06-20-2008 04:28 PM

RE: Northstar mods - Tell me what you think
 
Depending on the servo you plan to use, I would have installed it directly near the engine (micro servo) or right behind the fuel tank with a sullivan link. I think there are not that many options actually. [:-]

knifeedgeyak 06-23-2008 08:57 AM

RE: Northstar mods - Tell me what you think
 
Thats what I did. It is about 5 inchs from the engine with the servo facing down. So the linkage is outside the narcle. That way it does not interfer with the fuel tank and will be easy to make changes.


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