People,

I'm going to be building a Sig 1/5 scale Cub soon. I'm thinking of a Magnum .70 4-stroke as the engine even though the recommended 4-stroke is .45-.65. Any thoughts or comments?

papermache

I'm about 80% finished with a 1/5 scale cub and have a OS 70 Surpass FS. I think is should be just right. If you decide to buy I would be glad to go over several problems with the kit. Don't get me wrong, it is a great kit, but there are several things to watch for..Fred123[&:]

The .70 would do well. You can turn a scale prop, have poo-poo loads of extra power, and just tootle around at low throttle. Even the upper end of the recommendrd range is way plenty. I've got a .65 Saito in my 1/5 Sig, love it.

Fred--what didn't you like about the kit? Just curious.

Ken: The stock landing gear supplied with the kit did not agree with the prints. No real problem, just had to know which way to go. A piece in the vertical fin was cut wrong. In my opinion, the horizontal stab. is too light and fragile, especially at the joints with the ribs. This was componded when some of the balsa for it was brittle. Should have gotten a new piece from Sig, but made the decision to just reinforce the joints with gussets. No provisions for an antenna tube. This is an easy one to forget.. Again don't get me wrong, it is a very good kit and I would buy it again. .. Fred123[&:]

Sig has been kitting the 1/5 Cub for 30 years. Surprising that the dies would start producing incorrect parts now, but I guess anything is possible hey?

As for the motors....the .70 recommendation is good. Keep in mind that the 4C recommendation was made years ago. Today's 70-72's weigh the same as the .45'-.65's of yore, with the benefit of an added measure of power.

We don't want to overpower, but we DO want adequate power. My thinking is that motors such as the OS .52/.70 or Saito .56/.72 would be good choices to power this model.

Enjoy!

'Race

RaceCity wrote: No they haven't. You are probably thinking about the 1/6 scale Cub that has been around for ages. The 1/5 is a rather new design and has been around for only a couple of years. Most of this kit is laser cut wood.

/Red B.

Fred, I see your points, and agree with most. The pieces that make up the outside of the H.stab and V. stab do pose weaknesses, would have been much better if laminated from longer, thinner pieces with joints overlapping. I feel the rudder / V. stab is really the weaker point, because when you inevitably nose-over and flip on landing (and it WILL happen), the top of the rudder takes a beating, as it is the first thing to hit. It usually cracks at the upper corner of the V.stab, and the hinges eventually break or loosen. I have already replaced the rudder hinges, and next time they need a repair, I will most likely have to replace the rudder, and maybe the hinge post of the V. stab. IMO, Sig should consider making the hinge posts from hardwood, and using a laminated structure for the V. stab and rudder. I have had no problems with the H.stab or elevator; the brace wires do seem to help. As far as the landing gear goes, I didn't use the kit supplied wire, but put a scale repro on from the start. This kit is nice enough that the scale gear was well worth the cost. For the antenna tube, it's too easy to make your own from a control rod tube. My only regret was putting mine outside under the fuse, rather than inside and hiding it.

But, like you, I would definitely buy another one of this make (Sig) and happily recommend it to anyone.

Race, this plane is a long-produced kit, but is much changed. It's all laser-cut, now, no die crushing. BTW, where do you fly? I'm just up the road a ways, in Newton. Do you fly at the Midlands field? I was there last month for a giant scale fly-in, very nice field. Try to make it up for our(West Hickory AeroModelers) GSWA warbird fly-in in October (28-29) at Wilson Field.

Dang...you guys got me. I was thinking about that this morning. The 1/6 scale is the oldie. The 1/5th size is something a bit newer.

I fly in Mt. Pleasant. Today is looking mighty fine too!!

'Race