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brucea's blog
Posted by brucea | Sep 01, 2008 @ 04:21 PM | 11,235 Views
My Friends,

The first step in building a plane from a balsa kit is acquiring a building board. The building board is used to hold parts pinned in proper alignment during the building process. Or more precisely, the building board holds the pins that hold the parts in proper alignment.

The building board has to be soft enough to allow pins to be easily inserted and removed. The building board has to be hard enough to hold the pins firmly, and resist deformation. The material I personally favor for kit building is a fiberboard product variously called "Sound Board", "Sound Deadening Board", or "Sound Stop Board". This material ranges in color from a light tan to a dark brown.

A few of my friends on RCGroups have been searching for building board material. My good friend, Chuck "NoFlyZone", has had no end of difficulty finding proper building board material. To aid Chuck, and others, I took a trip to Home Depot and Lowes with my camera to produce a visual record of what to look for when shopping for a building board.

Thanks, Bruce
Posted by brucea | Apr 24, 2008 @ 01:22 PM | 4,309 Views
Place holder for future Tiger modifcations, which will include:

Torque rod landing gear,
Battery bay modifications to acheive balance without added weight, and
tail wheel/skid modifications.
Posted by brucea | Mar 07, 2007 @ 10:33 AM | 7,863 Views
Friends,

After much research, I have compiled the following information regarding iron-on film. I gathered this covering information from factory specifications, and other published sources. I found some inconsistencies between different sources. I did my best to reconcile these inconsistencies. I also found some problems in the published specifications in conversion between metric (SI) units and US customary/English units.

So take this information with a grain of salt. I first put this table together to explain to a new builder (Controlled Fall) that not all iron-on film covering is the same. The temperatures listed in the table are relative. For example, I have found that So-Lite solid blue requires a bit more heat than So-Lite solid white. So-Lite white covering is pretty thin stuff.

I hope you find this useful.

Thanks, Bruce
Posted by brucea | Feb 05, 2007 @ 07:01 AM | 5,451 Views
Here are some pictures of my Goldberg Tiger 400 build with an Eflite Park 400 Outrunner, 920 Kv. I wanted a clean conversion from the stock 400 brushed motor to the more powerful outrunner. I fabricated a firewall from 3/32" plywood. I used a set of 4-40 x 3/4" blind nut bolts to mount the motor. I put slots the original rail motor mounts to accommodate the firewall. I placed the new outrunner at the same thrust line and angle as the original motor. I braced the firewall, top and bottom with 3/16" x 5/16" balsawood strips. I sheeted the top of the fuselage with 3/32" balsa, and covered the front of the fuselage with matching Cub Yellow Econocote.

Using a 9x7 APC propeller. The Eflite motor and propeller combo pull quite nicely and shows no sign of overstressing the motor mount. The motor is rated at 145 Watts. The AUW of the Tiger is 20 ounces. This yields a power per pound of 116 Watts. The Tiger flys pretty well. I was trying to create a nice pattern acrobatic plane.

Thanks, Bruce