....just double check the spar so it isn't cracked. If you have broken fibres add som tow on the outside and clamp it down with mylar.....

/Jonas Ekman

Originally Posted by oakman7004

....just double check the spar so it isn't cracked. If you have broken fibres add som tow on the outside and clamp it down with mylar.....

/Jonas Ekman

Not sure how to check the spar... Where is it located (right in thickest part of airfoil)? Is it a carbon rod or flat rectangular bar? How big? What can I do to tell if it's cracked or not without looking in there?

Thanks for your help, Jonas.

I know with some solid core wings (particularly the XXLite) you can see the spar quite clearly if you just hold the wing up to a bright light. The skin is thin enough and the foam is transparent enough that some light will go through the wing and the spar shows up nicely.

The spar is 2" from the LE where the delam is. It is just carbon tow between the skin and rohacell foam in that area. Look for cracks in the skin like you have towards the TE...the pic do not show any crack so your'r most likely ok.

A easy way is to check is also to gently bent the wing to see that the spar is getting a nice "bend" if the tow is broken you see this......

/Jonas Ekman

I've used big bags of rice outside mylars to get a nice conformal weight distribution on a delam like that. Definitely inject resin under the skin though - or at least prick the skin a bunch if you don't want to inject.

Success for the Polaris at The Bruce... Well done lads....

http://www.rcgroups.com/forums/showthread.php?t=1565321

Just finished a Light Version of the Polaris and the weight is 8.5 oz. Test in the morning with report, I can only hope it will holds up to my launch although the wing is still very stiff! Wish me luck...
Donnie

It would probably hold up to MY launch. I wish my piggy Polaris (10.5oz) weighed 8.5. Is it just the wing layup that's different?

Yes less material in the wing. I will take it easy but I think it going to hold up. Fingers crossed.
Donnie

Roll Tape! Do not launch w/o video going!!!!!!!

But Geesh, I dont want to fly against you and an 8.5 oz Polaris!

What people using for ballast?

I tried as hard as I could to break my light one, it took all I could give it. The light wings come with a suggestion not to use any ballast. At the IHLGF I had a midair with my standard and finished the contest flying my light wing with 1oz ballast. Not recommended but had no problems.

There is a built in ballast box on the Polaris fuse. I cut a 1oz slab of lead and pound it into a plate that fits nicely in the box. With a tight fit you can get 3 in there. The tungsten ballast for pinewood derby cars works well too.

Bruce

You can wrap the slugs in tape to get a snug fit if needed. I made some balsa "fillers" on either end of the slugs, then wrapped all in tape until I got the proper fit.

I get a lot of PM here for info about the Polaris and availability so I will post for everyone. I take care of all USA orders for Momentum Model Technologies. For outside USA sales you will find an e-mail link on the MMT website. There is no priority for orders taken, they get built in the order they were received. Right now my guess is an order today is 1.5-2 months away from your doorstep. If you are interested in getting one custom built just for you please shoot me an e-mail here: bruce.davidson@momentum-mt.se

This is my standard reply once you contact me and place your order:

Thank your for inquiring about an order. I will need your shipping address and phone number. When I have the models in my hand I will send you an invoice with payment instructions. I will ship your kit as soon as payment is received. Payment for the kit will be Paypal directly to MMT and payment for shipping will go to me. Shipping is actual cost and normally between $55-$75 depending on your location. The standard Polaris kit is $950.00.

Here are your options:
Wing- left or right handed
Wing- standard, heavy or light layup. Durability will reflect in your layup choice. The light layup should not be flown with ballast.
Wing- Tip color options are, red, blue, orange, white or yellow at no extra charge. Dayglow yellow, dayglow green dayglow orange (+3-5g extra) plus $30.00. Full painted wing plus $50.00 Normally there is a white accent stripe on top and white stripes on bottom. Bottom stripes can match tips if you like.
Wing- Molded in Hyperion servos, +$200.00
Tails- standard, light or heavy layup, Kevlar strip for rudder hinge and left or right handed fin. Painted tails to match wing color will add about 5g to the overall weight and $10.00 to your order, +1g on the tails.
Orders of 3 or more (get your flying biddies in on it) will be shipped directly from Sweden to you with a big savings in freight.

Bruce

Momentum Model Technologies website: http://www.momentum-mt.se/

Originally Posted by jfinch

What people using for ballast?

For you Finch I would reccommend using light weight foam. I know after BSOC you are going to be on a mission. How is the polaris treating you?
Donnie