たまには真面目な話

久々更新で珍しく(?)まともな事を書いてみよう。

以前書いたかどうかは定かじゃないけど、航空用の燃料(プロペラ機)は『未だに』有鉛。
車のガソリンは無鉛が常識、と言うかそれ以外あるの?ぐらいのノリになって来てるけど、
航空用にはオクタン価80-87(Red)、100LL(Blue)、100(Green)全てにおいて鉛入り。
色は実際に燃料を見た時の色。一般的な機体は100LL(Low lead,つまり鉛少な目)を使う。

こっちでの容量の単位はクオート、ガロンを使うけど、小型2人乗りのセスナ152型で
一時間の消費燃料は5ガロン前後。5ガロン、つまり5x3.75で約18リットル。
2時間半も飛べば普通の乗用車の燃料タンクは0になるぐらいの計算。

それぐらい大量の燃料を燃やしてるわけで、しかも有鉛で。
環境に良くない事この上ない。常々こればっかりは何とかならない物か、と思ってたんだけど
ようやく、と言うか少しずつ改善の兆しが出てきたのかもしれない。
ちなみに、一応注釈しておくと、有鉛燃料はシリンダー内での異常燃焼(Detonation)を防ぐ。
飛んでる間になった事はないけど、非常に厄介。と言うかDetonationが収まらなかったら降りる。
圧縮比を上げられる事が最大のメリットなんだろうけど、安全か、環境保全か、の両天秤。

今日の記事元はEAA(Experimental Aircraft Association)の定期メールニュース。
エンブリ-リドル航空大学(アメリカ内で最も大きい航空大学)が
トレーニングで使う燃料をバイオ燃料に切り替えて試験運用するって言う内容だった。

エコが叫ばれる昨今、こう言う動きは応援していきたい。
究極のエコは飛ぶのやめる、なんだけど。。

・・・将来は電気飛行機か(ちなみに実用レベルに近い形の物が出来てる)。






From EAA e-hotline February.


Embry-Riddle to Test Swift Fuel in Fleet
ERAU Ramp

February 25, 2010 — Embry-Riddle Aeronautical University announced plans this week to phase in lead-free biofuel produced by Swift Enterprises for use in its training aircraft, the nation’s largest (95 aircraft) collegiate fleet. Swift fuel is a renewable biofuel synthesized from sorghum that has been successfully tested by the FAA Technical Center.

Engineers at ERAU’s Eagle Flight Research Center in Daytona Beach, Florida, will begin certification testing in about three weeks that will enable more than 40 Cessna 172s – nearly half the fleet – to operate on Swift fuel, said Richard “Pat” Anderson, associate professor of aerospace engineering, chief investigator in the research project, and director of the Eagle Flight Research Center. He is also president of the International Aerobatic Club Chapter 288.

“We believe this effort by Embry-Riddle and Swift will guide the way to a large-scale switch by the general aviation industry to alternative fuels,” he said. Swift Enterprises is based at the Purdue Research Park of West Lafayette, Indiana.

ERAU will also test the fuel on one of its Piper Seminoles, operating one of two engines on Swift fuel at first. Tentative plans are to exhibit that airplane to Oshkosh this year and discuss the Swift-ERAU program, Anderson said.

Anderson estimated the certification testing project to run about two and a half years. They are also partnering with AvFuel to distribute the fuel - about 15,000 gallons per year. ERAU uses about a million gallons of aviation fuel per year, Anderson said.

Small aircraft burn nearly 190 million gallons of aviation fuel annually, contributing 45 percent of all U.S. lead emissions, according to the Environmental Protection Agency. Removing lead from aviation fuel has been technically challenging because lead prevents detonation in airplane engines, which have much higher compression than automobile engines. Swift fuel has passed the FAA’s detonation test and gets more miles per gallon than current aviation fuel.

[PR]

by Twintailwings | 2010-03-03 11:01 | Aviation  

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