月別アーカイブ: 2025年4月

Progress report.

投稿日時: 投稿者:

I guess the overall exterior is mostly done… setting aside the finer details.

No decent references for the cooling or fuel lines, so it’s all mostly guesswork at this point—but I do want to hook up whatever looks like it ought to connect.

…aaaaand I forgot to render the wing-skin radiators. Brilliant. Just brilliant.😅

細かいディテールを除けば外観が一通りできたかな…冷却系や燃料系のパイプ回りの資料も無いのでほとんど推測になるけれど、つなぐべきものはつなぎたい。

あ、翼面のラジエータ、レンダリング忘れた w

Cooling System of the Piaggio PC7: Side-Mounted Forward Radiator
📌 Distinctive Design Features:

投稿日時: 投稿者:
  • Equipped with a water-cooled Isotta Fraschini Asso engine

  • Thin-profile radiators installed on the forward sides of the fuselage

  • The design closely resembles a surface-cooling (film-circulation) system, optimized to minimize aerodynamic drag

  • The radiators are either integrated into the aircraft skin or embedded in such a way that their weight is distributed across the fuselage structure

    🧪 Weight Estimation: Radiator + Oil Tank in the PC7
    Here we re-estimate the internal breakdown of the declared 47 kg, based on design logic similar to that of the Piaggio PC7:
  1. Oil Volume (Prioritizing Cooling Performance)
    • For racing use, maximum cooling efficiency is assumed, with approx. 30 liters of oil on board

    • Specific gravity of aviation engine oil: 0.9 kg/L

    • Oil weight: approx. 27–30 kg

  2. Oil Tank (Aluminum Construction)
    • Located just beneath the engine, mounted forward

    • Capacity around 30L, built from ultra-thin aluminum (≤1.5mm thick)

    • Weight: approx. 3–4 kg

  3. Radiator (Fuselage Side-Mounted)
    • Thin-film structure following the curvature of the fuselage

    • Despite the large surface area, the materials are extremely lightweight (supported by the airframe)

    • Internal piping is ultra-fine, made from brass or aluminum for corrosion resistance and heat dissipation

    • For racing + bonded installation: weight approx. 13–17 kg

      📊 Estimated Breakdown (PC7 Spec)

Component Estimated Weight
Engine Oil (max load) approx. 28–30 kg
Oil Tank (aluminum) approx. 3–4 kg
Radiator (thin side-mounted) approx. 13–15 kg
Total 47 kg
💡 Explanation:
This configuration fits the unique design philosophy of the Piaggio PC7 exceptionally well:

  • Primary cooling is handled by thin-profile radiators exposed to direct airflow

  • Placing the oil tank close to the engine improves circulation efficiency

  • Both the tank and radiator are designed as consumable components integrated into the aircraft’s outer skin, balancing weight reduction with ease of maintenance


🔍 Piaggio PC7 の冷却構造：前方側面ラジエーターの場合

📌 特徴的な設計要素：

  • 水冷エンジン（Isotta Fraschini Asso）を搭載
  • 機体前方の側面に「薄型ラジエーター」を設置
  • 表面冷却型（皮膜循環式）に近く、空気抵抗を最小限に抑えるデザイン
  • ラジエーターは機体の外板と一体化しているか、埋め込み式で重量を機体構造に分担させている

🧪 重量推定：PC7のラジエーター＋オイルタンク

ここでは47 kgという公称重量の中から、Piaggio PC7 のような設計思想に沿って、オイル・タンク・ラジエーターの内訳を再推定してみます：

1. オイル量（冷却を優先）

  • レース用で冷却性能を最大化するため、約30L程度のオイルを搭載と仮定
  • 航空エンジンオイルの比重：0.9 kg/L
  • オイル重量：約27～30 kg

2. オイルタンク（アルミ製）

  • エンジン直下、前方設置
  • 容量30L程度、板厚1.5mm以下の極薄アルミ製
  • 重量：約3～4 kg

3. ラジエーター（機体側面に設置）

  • 側面に沿う薄膜構造
  • 表面積が広くても構造材が非常に軽量（機体が支持）
  • 内部配管は極細で、素材は真鍮またはアルミ（耐腐食・放熱重視）
  • レース用途＋貼付式＝重量：約13～17 kg

📊 推定内訳（PC7仕様）