Golden
Era Model Service
High
Quality Plan Sets for Radio Control Aircraft
74 inch San Josè
A 1948 design by Antonio Arria
The
F1A "instrument panel" bulkhead has been installed and sheeted with
1/16 balsa. Early plans do not have templates for this
sheeting
or for the windshield but they are available as pdf updates. See
the link to updates on the first page of this log.
1/4
balsa scrap was installed inside the existing cheek cowls to act as a
support for a 1/32 ply front cover, inset 1/32. The upper section
of the
cover
was glued on permanently and will help retain the removable part.
This will allow access to the battery. The plan is to hold
the cover
on
with a tab on the front and magnets on the other end.
Something more robust will restrain the battery forward movement. The area above
the
side longerons has been filled in the time honored method with 3/4
square balsa, carved and sanded to shape, just like a Royal kit.
3S 2200 Battery from the side.
Hitec
HS-82MG servo installation. 1/4 square balsa has been added to
guide the flight battery in the bay between F1 and F2.
By
inverting one of the servos they can be mounted closer together with
long servo arms. Long servo arms are used to allow less tension and
more precision
of travel with the pull pull system. Kevlar thread is used.
The servo plate is removable if access to the lower servo is
neccessary.
Weight Analysis
Weights during construction
Flying weight observing the 8 ounce rule as a guideline would be 46 ounces.
| Wing uncovered complete, and covered | 10.8 oz. | 11.9 oz. |
| Fuselage with gear, no wheels | 9.1 oz | 11.5 |
| Tail group, uncovered, covered | 2.2 oz | 3.1 oz. |
| Total | 22.1 oz.
| 26.5 oz. |
| | |
| Dave Brown light 3 inch wheels | 1.9 oz | |
| Suppo 2814/8 Motor | 3.6 oz. | |
| Thunderbird 54 Speed Control | 1.6 oz. | |
| APC 12-6 electric propeller | 1.0 oz. | |
| Hobby King 3s 2200 mah LiPo | 6.7 oz. | |
| Servos | 1.3 oz. | |
| Receiver | 0.1 oz. | |
| Total equipment | 16.2 oz. | 16.2 oz. |
| Total Weight | 38.3 oz. | 42.7 oz. |
| | |
| | |
As
will be seen on the next page the wing attach parts were completed and
all the parts of the airplane except the
covering were placed in their planned locations including the flight battery. I was pleased to
see that the San Josè
balanced at 40% in this configuration. If
the airplane does handle well at 56% as on the free flight plan no
additional ballast will be needed. Ultracote transparent orange, which turns out to be a more amber color,
with dark blue trim on the wing was used to cover the San Jose. The covering of the fuselage did not add as much weight
as indicated, the addition included control fittings and other miscellanous items.
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