Herr J-3 build and RC conversion

[steveneill]

Recently our group was granted permission to fly planes 2 pounds and under. FF or electric only at Viola Fields. 20 minutes from home a lovely grass field by the sea.

So I'm building planes to accommodate the filed and it's rules. My large Cub is to big for the field and one of my favorites to fly. I looked for something in the 40 inch span and under category and found the Herr cub on the sig site.

So far it's framed up, gear installed and next week I start covering. This is an excellent kit as Herr kits usually are. I made a vacuum formed cowl to replace the solid wood version and it's sporting a Remfire 250 for power. It might come in under the half pound rule to be exempt from the FAA Regs. But certainly it will be under 2 pounds and perfect for our filed.

[Konrad]

I've looked at that same kit for conversion. Are you going to add the  needed over stab  covering hold down material to accomplish the cloth vertical fin fillet? I think I show how to do this in the Guillow Dumas conversion thread. (Reply #20)
https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=12443.0

While not a film covering technique I'd recommend for a first time film coverer. It is easy and within what I've seen of your work and your abilities.

All the best,

Konrad

[steveneill]

Konrad,

Thanks so much. I'll check it out. Much appreciated!

[Konrad]

Just a few hints in case it isn't clear in the other thread. I like to cheat a bit by making the centerline fillet a bit larger than scale. Also this technique requires that one understand that the covering will need to be stretched and shrunk.

All the best,

Konrad

[kaintuck]

20yr ago, had a 049 with 2 normal size servos....flew her ALOT from a lawn chair...so gentle, start the baby bee, launch and fly till the gas ran out...glide back to me in the chair and catch her....fuel up, start all over again....
Someone came along and wanted her.....one day I'll do another.....with smaller RC gear now...she'd be a floater!
Marc

[steveneill]

I am planning to fly this next Friday. She came out around 8 ounces. Read it a weep FAA.

[TimWescott]

I am planning to fly this next Friday. She came out around 8 ounces. Read it a weep FAA.

Sounds like the perfect weight for a 40" Cub, FAA or not.